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<body><span class="vcard"><a class="email" href="mailto:raphael_bost@alumni.brown.edu" title="Raphael Bost <raphael_bost@alumni.brown.edu>"> <span class="fn">Raphael Bost</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - [inline asm, AVX] Issue with the SSE register allocation in inline assembly"
href="https://bugs.llvm.org/show_bug.cgi?id=37402">bug 37402</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
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<tr>
<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
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<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>INVALID
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - [inline asm, AVX] Issue with the SSE register allocation in inline assembly"
href="https://bugs.llvm.org/show_bug.cgi?id=37402#c5">Comment # 5</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - [inline asm, AVX] Issue with the SSE register allocation in inline assembly"
href="https://bugs.llvm.org/show_bug.cgi?id=37402">bug 37402</a>
from <span class="vcard"><a class="email" href="mailto:raphael_bost@alumni.brown.edu" title="Raphael Bost <raphael_bost@alumni.brown.edu>"> <span class="fn">Raphael Bost</span></a>
</span></b>
<pre>Well, I had taken a look at this page
<a href="https://gcc.gnu.org/onlinedocs/gcc/Modifiers.html">https://gcc.gnu.org/onlinedocs/gcc/Modifiers.html</a>, and I understood the
paragraph about the '&' modifier completely differently (and I was not the only
one around me :). But now, it totally makes sense.
For the record, the part of the doc Craig mentioned is there:
<a href="https://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html#OutputOperands">https://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html#OutputOperands</a>
Thanks Craig,
And sorry for the false alarm.
(In reply to Craig Topper from <a href="show_bug.cgi?id=37402#c4">comment #4</a>)
<span class="quote">> I'll admit I'm not great with inline assembly rules, but don't you need to
> put an '&' in the output constraint for vc in Implementation 1.
>
> From gcc docs
>
> "Use the ‘&’ constraint modifier (see Modifiers) on all output operands that
> must not overlap an input. Otherwise, GCC may allocate the output operand in
> the same register as an unrelated input operand, on the assumption that the
> assembler code consumes its inputs before producing outputs. This assumption
> may be false if the assembler code actually consists of more than one
> instruction."</span ></pre>
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