<div dir="ltr">I believe at least some portion of the INLINEASM_BR decision is discussed here 

<a href="https://reviews.llvm.org/D53765?id=184024#inline-508610" target="_blank">https://reviews.llvm.org/D53765?id=184024#inline-508610</a> Anything that's on record anywhere should be in that review. I may have had some conversations with Chandler on IRC, but I'm not sure.<div><br></div><div><br clear="all"><div><div dir="ltr" class="m_6587867797989144775gmail_signature" data-smartmail="gmail_signature">~Craig</div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Jun 27, 2019 at 2:53 PM Finkel, Hal J. <<a href="mailto:hfinkel@anl.gov" target="_blank">hfinkel@anl.gov</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">



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<div class="m_6587867797989144775gmail-m_1468853571652631075moz-cite-prefix">On 6/27/19 2:31 PM, Craig Topper via llvm-dev wrote:<br>
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<div>What about SelectionDAG representation? Currently we expand callbr to INLINEASM_BR and BR. Both of which are terminators. But in order to support outputs we would need to put CopyFromReg nodes between them.</div>
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<p>Or maybe we should support having terminators that define values? People ask about this from time to time, and that seems like the higher-overall-value extension to make to the MI representation.</p>
<p> -Hal<br>
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<div dir="ltr" class="m_6587867797989144775gmail-m_1468853571652631075gmail_signature">~Craig</div>
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<div dir="ltr" class="gmail_attr">On Thu, Jun 27, 2019 at 12:18 PM Nick Desaulniers via cfe-dev <<a href="mailto:cfe-dev@lists.llvm.org" target="_blank">cfe-dev@lists.llvm.org</a>> wrote:<br>
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<div dir="ltr">+ CBL mailing list<br>
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<div dir="ltr" class="gmail_attr">On Thu, Jun 27, 2019 at 11:08 AM Bill Wendling <<a href="mailto:isanbard@gmail.com" target="_blank">isanbard@gmail.com</a>> wrote:<br>
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<div dir="ltr">[Adding the correct cfe-dev mailing list address.]</div>
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<div dir="ltr" class="gmail_attr">On Thu, Jun 27, 2019 at 11:06 AM Bill Wendling <<a href="mailto:isanbard@gmail.com" target="_blank">isanbard@gmail.com</a>> wrote:<br>
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<div dir="ltr"><span id="m_6587867797989144775gmail-m_1468853571652631075gmail-m_-8209466305209437809gmail-m_7315644313067770944gmail-m_-6035809721782067189gmail-docs-internal-guid-90f5d1f9-7fff-5d14-b18e-9466b93bf7e4">
<p style="text-align:left;line-height:1.38;margin-top:24pt;margin-bottom:0pt">Now that ASM goto support has landed, Nick Desaulniers and I wrote up a document describing how to expand clang's implementation of ASM goto to support output constraints. The work <i>should</i> be
 straight-forward, but as always will need to be verified to work. Below is a copy of our whitepaper. Please take a look and offer any comments you have.</p>
<p style="text-align:left;line-height:1.38;margin-top:24pt;margin-bottom:0pt">Share and enjoy!<br>
-bw</p>
<h1 dir="ltr" style="line-height:1.38;margin-top:24pt;margin-bottom:6pt"><span style="font-size:18pt;font-family:Arial;color:rgb(74,134,232);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">Overview</span></h1>
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-family:Arial;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">Support for
</span><a href="https://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html" style="text-decoration-line:none" target="_blank"><span style="font-family:"Roboto Mono",monospace;font-variant-numeric:normal;font-variant-east-asian:normal;text-decoration-line:underline;vertical-align:baseline;white-space:pre-wrap">asm
 goto</span></a><span style="font-family:Arial;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> with output constraints is a feature that the Linux community is interested in having.
 A</span><span style="font-family:Arial;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">dding this new feature should give Clang a higher profile in the Linux community:</span></p>
<br>
<ul style="margin-top:0pt;margin-bottom:0pt">
<li dir="ltr" style="list-style-type:disc;font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">It demonstrates the Clang community's commitment to supporting Linux.</span></p>
</li><li dir="ltr" style="list-style-type:disc;font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">Developers are likely to adopt it on their own, which means they will
 need to use Clang in some fashion, either as a complete replacement for or in addition to GCC.</span></p>
</li></ul>
<h1 dir="ltr" style="line-height:1.38;margin-top:24pt;margin-bottom:6pt"><span style="font-size:18pt;font-family:Arial;color:rgb(74,134,232);background-color:transparent;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">Current
 state</span></h1>
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-family:Arial;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">Clang's implementation of
</span><span style="font-family:"Roboto Mono",monospace;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">asm goto</span><span style="font-family:Arial;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 converts this code:</span></p>
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<table style="border:none;border-collapse:collapse">
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<tbody>
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<td style="vertical-align:top;background-color:rgb(248,248,248);padding:5pt;overflow:hidden">
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">int</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,0);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">vogon</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">(</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">unsigned</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 a, </span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">unsigned</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 b) {</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> 
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">asm</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,0);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">goto</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">(</span><span style="font-family:Consolas,sans-serif;color:rgb(221,17,68);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">"poetry
 %0, %1"</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> : :
</span><span style="font-family:Consolas,sans-serif;color:rgb(221,17,68);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">"r"</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">(a),
 "r"(b) : : error);</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> 
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">return</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 a + b;</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"></span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">error:</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> 
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">return</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(0,128,128);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">-1</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">;</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">}</span></p>
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<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-family:Arial;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">into the following LLVM IR:</span></p>
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<div dir="ltr" style="margin-left:0pt" align="left">
<table style="border:none;border-collapse:collapse">
<colgroup></colgroup>
<tbody>
<tr style="height:0pt">
<td style="vertical-align:top;background-color:rgb(248,248,248);padding:5pt;overflow:hidden">
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">define</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,0);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">@vogon</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">(</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%a</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%b</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">)
 {</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">entry:</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">  callbr void
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">asm</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">sideeffect</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(221,17,68);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">"poetry $0, $1"</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
</span><span style="font-family:Consolas,sans-serif;color:rgb(221,17,68);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">"r,r,X"</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">      (</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%a</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%b</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i8</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">*
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">blockaddress</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">(</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,0);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">@vogon</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%return</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">))</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">         
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">to</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 label </span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%asm.fallthrough</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 [label </span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%return</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">]</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"></span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">asm</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">.fallthrough:</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> 
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%add</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 = </span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">add</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%b</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%a</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> 
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">br</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 label </span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%return</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"></span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">return:</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> 
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%retval.0</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 = </span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">phi</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 [ </span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%add</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%asm.fallthrough</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 ], [ </span><span style="font-family:Consolas,sans-serif;color:rgb(0,128,128);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">-1</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%entry</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 ]</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> 
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">ret</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%retval.0</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">}</span></p>
</td>
</tr>
</tbody>
</table>
</div>
<br>
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">Our
 proposal won't change LLVM's current behavior</span><span style="font-family:Arial;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">–i.e. a
</span><span style="font-family:"Roboto Mono",monospace;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">callbr</span><span style="font-family:Arial;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 without a return value will act in the same way as the current implementation.</span></p>
<h1 dir="ltr" style="line-height:1.38;margin-top:24pt;margin-bottom:6pt"><span style="font-size:18pt;font-family:Arial;color:rgb(74,134,232);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">Proposal</span></h1>
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-family:Arial;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">GCC restricts
</span><span style="font-family:"Roboto Mono",monospace;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">asm goto</span><span style="font-family:Arial;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 from having output constraints due to limitations in its internal representation–i.e. GCC's control transfer instructions cannot have outputs.
</span><span style="font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">For example:</span></p>
<br>
<div dir="ltr" style="margin-left:0pt" align="left">
<table style="border:none;border-collapse:collapse">
<colgroup></colgroup>
<tbody>
<tr style="height:0pt">
<td style="vertical-align:top;background-color:rgb(248,248,248);padding:5pt;overflow:hidden">
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">int</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,0);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">vogon</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">(</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">int</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 a, </span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">int</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 b) {</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">  asm goto(</span><span style="font-family:Consolas,sans-serif;color:rgb(221,17,68);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">"poetry
 %0, %1"</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> :
</span><span style="font-family:Consolas,sans-serif;color:rgb(221,17,68);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">"=r"</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">(a),
</span><span style="font-family:Consolas,sans-serif;color:rgb(221,17,68);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">"=r"</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">(b)
 : : : </span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">error</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">);</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> 
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">return</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 a + b;</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"></span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">error</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">:</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> 
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">return</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 -1;</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">}</span></p>
</td>
</tr>
</tbody>
</table>
</div>
<br>
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-family:Arial;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">currently fails to compile in GCC
 with the following error:</span><span style="font-family:Arial;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span></p>
<div dir="ltr" style="margin-left:0pt" align="left">
<table style="border:none;border-collapse:collapse">
<colgroup></colgroup>
<tbody>
<tr style="height:0pt">
<td style="vertical-align:top;background-color:rgb(248,248,248);padding:5pt;overflow:hidden">
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"><</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">source</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">>:
 In function </span><span style="font-family:Consolas,sans-serif;color:rgb(221,17,68);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">'vogon'</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">:</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"><</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">source</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">>:</span><span style="font-family:Consolas,sans-serif;color:rgb(0,128,128);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">2</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">:</span><span style="font-family:Consolas,sans-serif;color:rgb(0,128,128);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">29</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">:
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">error</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">:
 expected </span><span style="font-family:Consolas,sans-serif;color:rgb(221,17,68);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">':'</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 before </span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">string</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 constant</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> 
</span><span style="font-family:Consolas,sans-serif;color:rgb(0,128,128);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">2</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 |   asm goto(</span><span style="font-family:Consolas,sans-serif;color:rgb(221,17,68);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">"poetry %0, %1"</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 : </span><span style="font-family:Consolas,sans-serif;color:rgb(221,17,68);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">"=r"</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">(a),
</span><span style="font-family:Consolas,sans-serif;color:rgb(221,17,68);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">"=r"</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">(b)
 : : : </span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">error</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">);</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">    |                         ^~~~~</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">    |                         :</span></p>
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<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-family:Arial;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">   </span></p>
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-family:Arial;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">ToT Clang matches GCC's behavior:</span></p>
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<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"><source>:</span><span style="font-family:Consolas,sans-serif;color:rgb(0,128,128);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">2</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">:</span><span style="font-family:Consolas,sans-serif;color:rgb(0,128,128);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">30</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">:
</span><span style="font-family:Consolas,sans-serif;color:rgb(0,134,179);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">error</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">:
 'asm </span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">goto</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">'
 cannot have </span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">output</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 constraints</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">  asm
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">goto</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">(</span><span style="font-family:Consolas,sans-serif;color:rgb(221,17,68);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">"poetry
 %0, %1"</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> :
</span><span style="font-family:Consolas,sans-serif;color:rgb(221,17,68);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">"=r"</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">(a),
</span><span style="font-family:Consolas,sans-serif;color:rgb(221,17,68);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">"=r"</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">(b)
 : : : </span><span style="font-family:Consolas,sans-serif;color:rgb(0,134,179);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">error</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">);</span></p>
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<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-family:Arial;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">However, LLVM doesn't restrict control
 transfer instructions from having outputs (e.g. the </span><a href="https://llvm.org/docs/LangRef.html#invoke-instruction" style="text-decoration-line:none" target="_blank"><span style="font-family:"Roboto Mono",monospace;font-variant-numeric:normal;font-variant-east-asian:normal;text-decoration-line:underline;vertical-align:baseline;white-space:pre-wrap">invoke</span><span style="font-family:Arial;font-variant-numeric:normal;font-variant-east-asian:normal;text-decoration-line:underline;vertical-align:baseline;white-space:pre-wrap">
 instruction</span></a><span style="font-family:Arial;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">). We propose changing LLVM's
</span><a href="https://llvm.org/docs/LangRef.html#callbr-instruction" style="text-decoration-line:none" target="_blank"><span style="font-family:"Roboto Mono",monospace;font-variant-numeric:normal;font-variant-east-asian:normal;text-decoration-line:underline;vertical-align:baseline;white-space:pre-wrap">callbr</span><span style="font-family:Arial;font-variant-numeric:normal;font-variant-east-asian:normal;text-decoration-line:underline;vertical-align:baseline;white-space:pre-wrap">
 instruction</span></a><span style="font-family:Arial;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> to allow return values, similar to how LLVM's implementation of inline assembly
 (via the </span><a href="https://llvm.org/docs/LangRef.html#call-instruction" style="text-decoration-line:none" target="_blank"><span style="font-family:"Roboto Mono",monospace;font-variant-numeric:normal;font-variant-east-asian:normal;text-decoration-line:underline;vertical-align:baseline;white-space:pre-wrap">call</span><span style="font-family:Arial;font-variant-numeric:normal;font-variant-east-asian:normal;text-decoration-line:underline;vertical-align:baseline;white-space:pre-wrap">
 instruction</span></a><span style="font-family:Arial;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">) allows return values. Since there can potentially be zero to many output constraints,
</span><span style="font-family:"Roboto Mono",monospace;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">callbr</span><span style="font-family:Arial;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 would now return an aggregate which contains an element for each output constraint.  These values would then be extracted via
</span><span style="font-family:"Roboto Mono",monospace;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">extractvalue</span><span style="font-family:Arial;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">.
 With our proposal, the above C example will be converted to LLVM IR like this:</span></p>
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<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">define</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,0);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">@vogon</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">(</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%a</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%b</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">)
 {</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">entry:</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> 
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%0</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 = callbr { </span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 } </span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">asm</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">sideeffect</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(221,17,68);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">"poetry $0, $1"</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
</span><span style="font-family:Consolas,sans-serif;color:rgb(221,17,68);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">"=r,=r,X"</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">      (</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i8</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">*
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">blockaddress</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">(</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,0);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">@vogon</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%error</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">))</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">         
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">to</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 label </span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%asm.fallthrough</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 [label </span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%error</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">]</span></p>
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"></span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">asm</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">.fallthrough:</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> 
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%asmresult.a</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 = </span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">extractvalue</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 { </span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 } </span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%0</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
</span><span style="font-family:Consolas,sans-serif;color:rgb(0,128,128);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">0</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> 
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%asmresult.b</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 = </span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">extractvalue</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 { </span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 } </span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%0</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
</span><span style="font-family:Consolas,sans-serif;color:rgb(0,128,128);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">1</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> 
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%result</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 = </span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">add</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%asmresult.a</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%asmresult.b</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> 
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">ret</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%result</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"></span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">error:</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> 
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">ret</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(0,128,128);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">-1</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">}</span></p>
</td>
</tr>
</tbody>
</table>
</div>
<br>
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-family:Arial;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">Note that unlike the
</span><span style="font-family:"Roboto Mono",monospace;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">invoke</span><span style="font-family:Arial;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 instruction, </span><span style="font-family:"Roboto Mono",monospace;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">callbr</span><span style="font-family:Arial;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">'s
 return values are assumed valid on </span><span style="font-family:Arial;color:rgb(0,0,0);font-style:italic;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">all</span><span style="font-family:Arial;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 branches. The assumption is that the programmer knows what their inline assembly is doing and where its output constraints are valid. If the value isn't valid on a particular branch but is used there anyway, then the result is a poison value. (Also,
</span><span style="font-variant-numeric:normal;font-variant-east-asian:normal;font-family:Arial;color:rgb(0,0,0);vertical-align:baseline;white-space:pre-wrap">if a
</span><span style="font-variant-numeric:normal;font-variant-east-asian:normal;font-family:"Roboto Mono",monospace;color:rgb(0,0,0);vertical-align:baseline;white-space:pre-wrap">callbr</span><span style="font-variant-numeric:normal;font-variant-east-asian:normal;font-family:Arial;color:rgb(0,0,0);vertical-align:baseline;white-space:pre-wrap">'s
 return values affect a branch, it will be handled similarly to the </span><span style="font-variant-numeric:normal;font-variant-east-asian:normal;font-family:"Roboto Mono",monospace;color:rgb(0,0,0);vertical-align:baseline;white-space:pre-wrap">invoke</span><span style="font-variant-numeric:normal;font-variant-east-asian:normal;font-family:Arial;color:rgb(0,0,0);vertical-align:baseline;white-space:pre-wrap">
 instruction's implementation.) Here's an example of how this would work:</span></p>
<br>
<div dir="ltr" style="margin-left:0pt" align="left">
<table style="border:none;border-collapse:collapse">
<colgroup></colgroup>
<tbody>
<tr style="height:0pt">
<td style="vertical-align:top;background-color:rgb(248,248,248);padding:5pt;overflow:hidden">
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">int</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,0);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">vogon</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">(</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">int</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 a, </span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">int</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 b) {</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">  asm goto(</span><span style="font-family:Consolas,sans-serif;color:rgb(221,17,68);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">"poetry
 %0, %1"</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> :
</span><span style="font-family:Consolas,sans-serif;color:rgb(221,17,68);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">"=r"</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">(a),
</span><span style="font-family:Consolas,sans-serif;color:rgb(221,17,68);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">"=r"</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">(b)
 : : : </span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">error</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">);</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> 
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">if</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 (a == </span><span style="font-family:Consolas,sans-serif;color:rgb(0,128,128);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">42</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">)</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">   
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">return</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(0,128,128);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">42</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 * b;</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> 
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">return</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 a + b;</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"></span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">error</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">:</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> 
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">return</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 b - 42;</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">}</span></p>
</td>
</tr>
</tbody>
</table>
</div>
<br>
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-family:Arial;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">generates the following LLVM IR:</span></p>
<br>
<div dir="ltr" style="margin-left:0pt" align="left">
<table style="border:none;border-collapse:collapse">
<colgroup></colgroup>
<tbody>
<tr style="height:0pt">
<td style="vertical-align:top;background-color:rgb(248,248,248);padding:5pt;overflow:hidden">
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">define</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,0);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">@vogon</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">(</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%a</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%b</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">)
 {</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">entry:</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> 
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%0</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 = callbr { </span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 } </span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">asm</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">sideeffect</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(221,17,68);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">"poetry $0, $1"</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
</span><span style="font-family:Consolas,sans-serif;color:rgb(221,17,68);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">"=r,=r,X"</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">      (</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i8</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">*
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">blockaddress</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">(</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,0);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">@vogon</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%error</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">))</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">         
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">to</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 label </span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%asm.fallthrough</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 [label </span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%error</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">]</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"></span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">asm</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">.fallthrough:</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> 
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%asmresult.a</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 = </span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">extractvalue</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 { </span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 } </span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%0</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
</span><span style="font-family:Consolas,sans-serif;color:rgb(0,128,128);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">0</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> 
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%tobool</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 = </span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">icmp</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">eq</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%asmresult.a</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
</span><span style="font-family:Consolas,sans-serif;color:rgb(0,128,128);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">42</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> 
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">br</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i1</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%tobool</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
 label </span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%if.true</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
 label </span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%if.false</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> 
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"></span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"></span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">if.</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">true</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">:</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> 
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%asmresult.b</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 = </span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">extractvalue</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 { </span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 } </span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%0</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
</span><span style="font-family:Consolas,sans-serif;color:rgb(0,128,128);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">1</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> 
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%mul</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 = </span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">mul</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(0,128,128);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">42</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%asmresult.b</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> 
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">ret</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%mul</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"></span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">if.</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">false</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">:</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> 
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%asmresult.a.1</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 = </span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">extractvalue</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 { </span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 } </span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%0</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
</span><span style="font-family:Consolas,sans-serif;color:rgb(0,128,128);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">0</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> 
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%asmresult.b.1</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 = </span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">extractvalue</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 { </span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 } </span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%0</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
</span><span style="font-family:Consolas,sans-serif;color:rgb(0,128,128);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">1</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> 
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%result</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 = </span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">add</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%asmresult.a.1</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%asmresult.b.1</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> 
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">ret</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%result</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"></span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">error:</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> 
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%asmresult.b.error</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 = </span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">extractvalue</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 { </span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 } </span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%0</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
</span><span style="font-family:Consolas,sans-serif;color:rgb(0,128,128);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">1</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> 
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%error.result</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 = </span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">sub</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%asmresult.b.error</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">,
</span><span style="font-family:Consolas,sans-serif;color:rgb(0,128,128);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">42</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"> 
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">ret</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">i32</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(153,0,115);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">%error.result</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
</span><span style="font-family:Consolas,sans-serif;color:rgb(51,51,51);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">}</span></p>
</td>
</tr>
</tbody>
</table>
</div>
<h1 dir="ltr" style="line-height:1.38;margin-top:24pt;margin-bottom:6pt"><span style="font-size:18pt;font-family:Arial;color:rgb(74,134,232);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">Implementation</span></h1>
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-family:Arial;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">Because LLVM's
</span><span style="font-family:"Roboto Mono",monospace;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">invoke</span><span style="font-family:Arial;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 instruction is a terminating instruction that may have return values, we can use it as a template for
</span><span style="font-family:"Roboto Mono",monospace;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">callbr</span><span style="font-family:Arial;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">'s
 changes. The new functionality lies mostly in modifying Clang's front-end. In particular, we need to do the following:</span></p>
<br>
<ul style="margin-top:0pt;margin-bottom:0pt">
<li dir="ltr" style="list-style-type:disc;font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">Remove all error checks restricting
</span><span style="font-family:"Roboto Mono",monospace;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">asm goto</span><span style="font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 from returning values, and</span></p>
</li><li dir="ltr" style="list-style-type:disc;font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">Generate the
</span><span style="font-family:"Roboto Mono",monospace;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">extractvalue</span><span style="font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 instructions on </span><span style="font-family:"Roboto Mono",monospace;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">callbr</span><span style="font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">'s
 branches.</span></p>
</li></ul>
<br>
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-family:Arial;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">LLVM's middle- and back-ends need
 to be audited to ensure there are no restrictions on </span><span style="font-family:"Roboto Mono",monospace;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">callbr</span><span style="font-family:Arial;color:rgb(0,0,0);font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">
 returning a value. We expect all passes to Just Work™ without modifications, but of course will be verified.</span></p>
</span></div>
</blockquote>
</div>
</blockquote>
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<br clear="all">
<div><br>
</div>
-- <br>
<div dir="ltr" class="m_6587867797989144775gmail-m_1468853571652631075gmail-m_-8209466305209437809gmail_signature">
<div dir="ltr">Thanks,
<div>~Nick Desaulniers</div>
</div>
</div>
_______________________________________________<br>
cfe-dev mailing list<br>
<a href="mailto:cfe-dev@lists.llvm.org" target="_blank">cfe-dev@lists.llvm.org</a><br>
<a href="https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev" rel="noreferrer" target="_blank">https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev</a><br>
</blockquote>
</div>
<br>
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<pre class="m_6587867797989144775gmail-m_1468853571652631075moz-quote-pre">_______________________________________________
LLVM Developers mailing list
<a class="m_6587867797989144775gmail-m_1468853571652631075moz-txt-link-abbreviated" href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>
<a class="m_6587867797989144775gmail-m_1468853571652631075moz-txt-link-freetext" href="https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev" target="_blank">https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev</a>
</pre>
</blockquote>
<pre class="m_6587867797989144775gmail-m_1468853571652631075moz-signature" cols="72">-- 
Hal Finkel
Lead, Compiler Technology and Programming Languages
Leadership Computing Facility
Argonne National Laboratory</pre>
</div>

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