<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 - [InstCombine] Missing range check transformation"
href="https://bugs.llvm.org/show_bug.cgi?id=43332">43332</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[InstCombine] Missing range check transformation
</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>int rangecheck (unsigned x) { return x - 1 <= __INT_MAX__ - 1; }
could be just (int) X > 0.
Clang
rangecheck(unsigned int): # @rangecheck(unsigned int)
addl $-1, %edi
xorl %eax, %eax
cmpl $2147483647, %edi # imm = 0x7FFFFFFF
setb %al
retq
GCC:
rangecheck(unsigned int):
xor eax, eax
test edi, edi
setg al
ret</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>