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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [InstCombine] Infinite loop in InstCombine on smax+cmp+select sequence"
href="https://bugs.llvm.org/show_bug.cgi?id=51419">51419</a>
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<th>Summary</th>
<td>[InstCombine] Infinite loop in InstCombine on smax+cmp+select sequence
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<th>Product</th>
<td>new-bugs
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>new bugs
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>cameron.mcinally@nyu.edu
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, spatel+llvm@rotateright.com
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<p>
<div>
<pre>The following test case is tripping an infinite loop in InstCombine. I've been
unable to track down the root cause yet.
This issue was found in release/13.x, but Godbolt shows it failing in trunk as
well.
<a href="https://godbolt.org/z/xKasbGheK">https://godbolt.org/z/xKasbGheK</a>
; RUN: opt -O3 -instcombine -S < %s
define i64 @infloop(double %d, i64 %a) {
%1 = fptosi double %d to i32
%2 = call i32 @llvm.smax.i32(i32 %1, i32 0)
%3 = icmp slt i32 %2, 2
%4 = zext i1 %3 to i32
%5 = select i1 %3, i32 %2, i32 1
%6 = zext i32 %5 to i64
%7 = mul i64 %6, 4
%8 = add i64 %a, %7
ret i64 %8
}</pre>
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