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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 - Optimize add X, -1; cmp X,-1; jne to add X, -1; jae"
href="https://bugs.llvm.org/show_bug.cgi?id=44412">44412</a>
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<th>Summary</th>
<td>Optimize add X, -1; cmp X,-1; jne to add X, -1; jae
</td>
</tr>
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<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<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>
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<th>Component</th>
<td>Backend: X86
</td>
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<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>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk, spatel+llvm@rotateright.com
</td>
</tr></table>
<p>
<div>
<pre>void foo (int i);
void bar (int i)
{
while (i--)
foo(i);
}
<a href="https://godbolt.org/z/RaXjQb">https://godbolt.org/z/RaXjQb</a>
bar(int): # @bar(int)
push rbx
test edi, edi
je .LBB0_3
mov ebx, edi
add ebx, -1
.LBB0_2: # =>This Inner Loop Header: Depth=1
mov edi, ebx
call foo(int)
add ebx, -1
cmp ebx, -1
jne .LBB0_2
.LBB0_3:
pop rbx
ret
Could be:
bar(int): # @bar(int)
push rbx
test edi, edi
je .LBB0_3
mov ebx, edi
add ebx, -1
.LBB0_2: # =>This Inner Loop Header: Depth=1
mov edi, ebx
call foo(int)
add ebx, -1
jae .LBB0_2
.LBB0_3:
pop rbx
ret</pre>
</div>
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