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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 - branch not eliminated"
href="https://bugs.llvm.org/show_bug.cgi?id=51080">51080</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>branch not eliminated
</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>All
</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>jmuizelaar@mozilla.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>void kill (void);
void foo (unsigned int arg)
{
int a = arg - 3;
unsigned int b = 4;
int x = 0x1 << arg;
if (a < 0)
b = x;
if (b >= 5)
kill ();;
}
produces:
foo(unsigned int): # @foo(unsigned int)
cmp edi, 3
jb .LBB0_2
add edi, -3
jns .LBB0_2
jmp kill() # TAILCALL
.LBB0_2:
ret
with clang trunk: -O2 -mllvm -enable-constraint-elimination
gcc trunk -O2 gives:
foo(unsigned int):
ret
test case from:
<a href="https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93781">https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93781</a></pre>
</div>
</p>
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