<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 - Suboptimal codegen: (x << 1) | 1 results in LEA+ADD while could be just LEA"
href="https://bugs.llvm.org/show_bug.cgi?id=41495">41495</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Suboptimal codegen: (x << 1) | 1 results in LEA+ADD while could be just LEA
</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>Keywords</th>
<td>code-quality
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</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>nok.raven@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>int foo(int x)
{
return (x << 1) | 1;
}
GCC/ICC:
lea eax, [rdi+1+rdi]
Clang:
lea eax, [rdi+rdi]
add eax, 1
Interestingly enough for 32bit target Clang produces:
mov eax, dword ptr [esp + 4]
lea eax, [eax+eax+1]
<a href="https://godbolt.org/z/PpiqqU">https://godbolt.org/z/PpiqqU</a></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>