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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - ExpandMemcmp fails to constant fold in the general case"
href="https://bugs.llvm.org/show_bug.cgi?id=45086">45086</a>
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<th>Summary</th>
<td>ExpandMemcmp fails to constant fold in the general case
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Common Code Generator Code
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>clement.courbet@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>define i1 @length2_gt_const(i8* %X, i8* %Y) nounwind {
; X64-LABEL: length2_gt_const:
; X64: # %bb.0:
; X64-NEXT: movzwl (%rdi), %eax
; X64-NEXT: movzwl .L.str+{{.*}}(%rip), %ecx
; X64-NEXT: rolw $8, %ax
; X64-NEXT: rolw $8, %cx
; X64-NEXT: movzwl %ax, %eax
; X64-NEXT: movzwl %cx, %ecx
; X64-NEXT: subl %ecx, %eax
; X64-NEXT: testl %eax, %eax
; X64-NEXT: setg %al
; X64-NEXT: retq
%m = tail call i32 @memcmp(i8* %X, i8* getelementptr inbounds ([513 x i8],
[513 x i8]* @.str, i32 0, i32 1), i64 2) nounwind
%c = icmp sgt i32 %m, 0
ret i1 %c
}</pre>
</div>
</p>
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