<html>
<head>
<base href="https://bugs.llvm.org/">
</head>
<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 - Missed optimisation - horizontal max for vectors is not optimised."
href="https://bugs.llvm.org/show_bug.cgi?id=23116">bug 23116</a>
<br>
<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>FIXED
</td>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
</tr></table>
<p>
<div>
<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Missed optimisation - horizontal max for vectors is not optimised."
href="https://bugs.llvm.org/show_bug.cgi?id=23116#c11">Comment # 11</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Missed optimisation - horizontal max for vectors is not optimised."
href="https://bugs.llvm.org/show_bug.cgi?id=23116">bug 23116</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>After:
<a href="https://reviews.llvm.org/rG056d31dd2a04">https://reviews.llvm.org/rG056d31dd2a04</a> (and several other patches as noted)
And with:
$ clang -O2 23116.c -S -o - -fno-signed-zeros -ffinite-math-only -mavx
We finally have the ideal output with the minimal relaxed FP settings:
vextractf128 $1, %ymm0, %xmm1
vmaxps %xmm1, %xmm0, %xmm0
vpermilpd $1, %xmm0, %xmm1 ## xmm1 = xmm0[1,0]
vmaxps %xmm1, %xmm0, %xmm0
vmovshdup %xmm0, %xmm1 ## xmm1 = xmm0[1,1,3,3]
vmaxss %xmm1, %xmm0, %xmm0
vzeroupper
retq</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>