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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 - Loop simplification with invariant code"
href="https://bugs.llvm.org/show_bug.cgi?id=50550">50550</a>
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<tr>
<th>Summary</th>
<td>Loop simplification with invariant code
</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>Windows NT
</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>#include <stddef.h>
bool s;
bool test1() {
bool r = false;
for(size_t i = 0; i < 1; ++i) {
if (s)
r = true;
}
return r;
}
bool test2() {
bool r = false;
for(size_t i = 0; i < 2; ++i) {
if (s)
r = true;
}
return r;
}
test1(): # @test1()
cmp byte ptr [rip + s], 0
setne al
ret
test2(): # @test2()
mov al, byte ptr [rip + s]
ret
s:
.byte 0 # 0x0
<a href="https://godbolt.org/z/rGv7z9q5W">https://godbolt.org/z/rGv7z9q5W</a>
BTW, LLVM 12 and lower produces same ideal codegen for both functions</pre>
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