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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Missed negation pattern"
href="https://bugs.llvm.org/show_bug.cgi?id=44234">44234</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Missed negation pattern
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>david.bolvansky@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>int f1 (int t, int v, int x)
{
int a = t - x;
int b = a * v;
return 0 - b;
}
int f2 (int t, int v, int x)
{
int a = v - t;
int b = a * x;
return 0 - b;
}
GCC:
f1(int, int, int):
sub edx, edi
mov eax, edx
imul eax, esi
ret
f2(int, int, int):
sub edi, esi
mov eax, edi
imul eax, edx
ret
LLVM:
f1(int, int, int):
mov eax, edi
sub eax, edx
imul eax, esi
neg eax
ret
f2(int, int, int):
mov eax, esi
sub eax, edi
imul eax, edx
neg eax
ret
<a href="https://godbolt.org/z/afTGuz">https://godbolt.org/z/afTGuz</a></pre>
</div>
</p>
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