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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 opportunity for value range propagation from binary ops"
href="https://bugs.llvm.org/show_bug.cgi?id=48643">48643</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Missed opportunity for value range propagation from binary ops
</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>extern void foo (void);
void
foo (unsigned int x, unsigned int y)
{
unsigned int min;
if (x >= 3 && x <= 6)
return;
if (y >= 5 && y <= 8)
return;
min = x < y ? x : y;
if (min == 5)
foo ();
if (min == 6)
foo ();
}
LLVM (even with experimental CE pass)
foo(unsigned int, unsigned int): # @foo(unsigned int, unsigned int)
lea eax, [rdi - 3]
cmp eax, 4
jb .LBB0_4
lea eax, [rsi - 5]
cmp eax, 4
jb .LBB0_4
cmp edi, esi
cmovb esi, edi
cmp esi, 6
je .LBB0_5
cmp esi, 5
jne .LBB0_4
.LBB0_5:
jmp foo() # TAILCALL
.LBB0_4:
ret
GCC:
foo(unsigned int, unsigned int):
ret
<a href="https://godbolt.org/z/sMc4s7">https://godbolt.org/z/sMc4s7</a></pre>
</div>
</p>
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