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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 - Missing fold &a[i] - &a[j] => i - j"
href="https://bugs.llvm.org/show_bug.cgi?id=47430">47430</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Missing fold &a[i] - &a[j] => i - j
</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>typedef __SIZE_TYPE__ size_t;
size_t a[64];
size_t f(size_t b, size_t c)
{
return &a[b] - &a[c];
}
Clang:
f(unsigned long, unsigned long): # @f(unsigned long, unsigned long)
sub rdi, rsi
lea rax, [8*rdi]
sar rax, 3
ret
a:
.zero 512
GCC:
f(unsigned long, unsigned long):
mov rax, rdi
sub rax, rsi
ret
a:
.zero 512
<a href="https://godbolt.org/z/7M8o5a">https://godbolt.org/z/7M8o5a</a></pre>
</div>
</p>
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