<div dir="ltr">Looks like gcc 4.8.1 uses xmm for doubles if only sse1 is enabled. Curiously it still issues a movsd instruction which is sse2...</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Wed, Oct 16, 2013 at 9:31 AM, Nadav Rotem <span dir="ltr"><<a href="mailto:nrotem@apple.com" target="_blank">nrotem@apple.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word"><div>I am not sure. Do we know what GCC and ICC do? According to this[1] on x86-32bit floats are passed on ST0. </div>
<div><br></div><div>[1] - <a href="https://developer.apple.com/library/mac/documentation/developertools/conceptual/LowLevelABI/130-IA-32_Function_Calling_Conventions/IA32.html" target="_blank">https://developer.apple.com/library/mac/documentation/developertools/conceptual/LowLevelABI/130-IA-32_Function_Calling_Conventions/IA32.html</a></div>
<div><br><div><div>On Oct 16, 2013, at 7:54 AM, Craig Topper <<a href="mailto:craig.topper@gmail.com" target="_blank">craig.topper@gmail.com</a>> wrote:</div><br><blockquote type="cite"><div dir="ltr">Nadav, what do you think?</div>
<div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, Oct 10, 2013 at 6:14 AM, Demikhovsky, Elena <span dir="ltr"><<a href="mailto:elena.demikhovsky@intel.com" target="_blank">elena.demikhovsky@intel.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<div lang="EN-US" link="blue" vlink="purple">
<div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">FP passed in XMM starting from SSE2.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Intel SSE processor did not support 64-bit mode and all parameters were in FP stack (X87) registers.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal" style="margin-left:36.0pt">
<u></u><span style="font-family:"Calibri","sans-serif";color:#31849b"><span>-<span style="font:7.0pt "Times New Roman"">
</span></span></span><u></u><span dir="LTR"></span><b><i><span style="color:#31849b"> Elena<u></u><u></u></span></i></b></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> <a href="mailto:llvm-commits-bounces@cs.uiuc.edu" target="_blank">llvm-commits-bounces@cs.uiuc.edu</a> [mailto:<a href="mailto:llvm-commits-bounces@cs.uiuc.edu" target="_blank">llvm-commits-bounces@cs.uiuc.edu</a>]
<b>On Behalf Of </b>Craig Topper<br>
<b>Sent:</b> Thursday, October 10, 2013 07:00<br>
<b>To:</b> <a href="mailto:llvm-commits@cs.uiuc.edu" target="_blank">llvm-commits@cs.uiuc.edu</a><br>
<b>Subject:</b> [Patch] Only pass f32/v4f32 in xmm registers in x86-64 if only sse1 is suppored<u></u><u></u></span></p><div><div><p class="MsoNormal"><u></u> <u></u></p>
<div><p class="MsoNormal">Not sure if this is actually the right thing to do, but it fixes an issue on llvm-dev where XMM->FP copy was being created.<u></u><u></u></p>
<div><p class="MsoNormal"><u></u> <u></u></p>
</div>
<div><p class="MsoNormal">This patches makes integer vector types and f64 only pass in xmm if sse2 is enabled which is when these types are assigned to the xmm class.<br clear="all">
<u></u><u></u></p>
<div><p class="MsoNormal"><u></u> <u></u></p>
</div><p class="MsoNormal">-- <br>
~Craig <u></u><u></u></p>
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</blockquote></div><br><br clear="all"><span class="HOEnZb"><font color="#888888"><div><br></div>-- <br>~Craig
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</blockquote></div><br></div></div></blockquote></div><br><br clear="all"><div><br></div>-- <br>~Craig
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