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<body><span class="vcard"><a class="email" href="mailto:spatel+llvm@rotateright.com" title="Sanjay Patel <spatel+llvm@rotateright.com>"> <span class="fn">Sanjay Patel</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - clang emits unnecessary vinsertf128 and vextractf128"
href="https://llvm.org/bugs/show_bug.cgi?id=15487">bug 15487</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
</tr>
<tr>
<td style="text-align:right;">CC</td>
<td>
</td>
<td>spatel+llvm@rotateright.com
</td>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>FIXED
</td>
</tr></table>
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<div>
<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - clang emits unnecessary vinsertf128 and vextractf128"
href="https://llvm.org/bugs/show_bug.cgi?id=15487#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - clang emits unnecessary vinsertf128 and vextractf128"
href="https://llvm.org/bugs/show_bug.cgi?id=15487">bug 15487</a>
from <span class="vcard"><a class="email" href="mailto:spatel+llvm@rotateright.com" title="Sanjay Patel <spatel+llvm@rotateright.com>"> <span class="fn">Sanjay Patel</span></a>
</span></b>
<pre>I think we now produce the ideal codegen for your test case using clang built
from r233098. Sorry, but I can't cite specific commits that account for the
improvements:
$ ./clang -O2 -mavx 15487.c -o - -S -fomit-frame-pointer
...
movq _DATA@GOTPCREL(%rip), %rax
vmovups (%rax), %ymm0
vmovups 4(%rax), %ymm1
vextractf128 $1, %ymm0, %xmm2
vextractf128 $1, %ymm1, %xmm3
vpaddd %xmm1, %xmm1, %xmm1
vpaddd %xmm0, %xmm1, %xmm0
vpaddd %xmm3, %xmm3, %xmm1
vpaddd %xmm2, %xmm1, %xmm1
vinsertf128 $1, %xmm1, %ymm0, %ymm0
vmovups %ymm0, (%rax)
vzeroupper
retq
Feel free to reopen if you disagree</pre>
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