<html>
<head>
<base href="https://bugs.llvm.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [X86] Faliure to produce LEA from add(trunc(add(x, y)), C)"
href="https://bugs.llvm.org/show_bug.cgi?id=49925">49925</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[X86] Faliure to produce LEA from add(trunc(add(x, y)), C)
</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>Backend: X86
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>lebedev.ri@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk, pengfei.wang@intel.com, spatel+llvm@rotateright.com
</td>
</tr></table>
<p>
<div>
<pre>int good(int x, int y) {
return (x + y) - 31;
}
char bad(int x, int y) {
return x + y - 31;
}
<a href="https://godbolt.org/z/adncTno96">https://godbolt.org/z/adncTno96</a>
good(int, int): # @good(int, int)
leal -31(%rdi,%rsi), %eax
retq
bad(int, int): # @bad(int, int)
leal (%rdi,%rsi), %eax
addb $-31, %al
retq
<a href="https://alive2.llvm.org/ce/z/UFxwYE">https://alive2.llvm.org/ce/z/UFxwYE</a>
It seems we don't even try to run LEA peephole on that outer i8 add.</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>