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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 - [AArch64] unnecessary cmp instruction with subtract and conditional select"
href="https://llvm.org/bugs/show_bug.cgi?id=31175">bug 31175</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;">Resolution</td>
<td>---
</td>
<td>FIXED
</td>
</tr></table>
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [AArch64] unnecessary cmp instruction with subtract and conditional select"
href="https://llvm.org/bugs/show_bug.cgi?id=31175#c7">Comment # 7</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [AArch64] unnecessary cmp instruction with subtract and conditional select"
href="https://llvm.org/bugs/show_bug.cgi?id=31175">bug 31175</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>Should be fixed after:
<a href="https://reviews.llvm.org/rL289738">https://reviews.llvm.org/rL289738</a>
This solves the only problem I've seen when trying to canonicalize the min/max
IR pattern:
define i32 @max(i32 %x, i32 %y) {
%sub = sub nsw i32 %x, %y
%cmp = icmp sgt i32 %x, %y
%sel = select i1 %cmp, i32 %sub, i32 0
ret i32 %sel
}
to:
define i32 @max(i32 %x, i32 %y) {
%sub = sub nsw i32 %x, %y
%cmp = icmp sgt i32 %sub, 0
%sel = select i1 %cmp, i32 %sub, i32 0
ret i32 %sel
}</pre>
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