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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Missed folding for comparisions between allocated pointer and global variables/functions"
href="https://bugs.llvm.org/show_bug.cgi?id=38956">38956</a>
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<th>Summary</th>
<td>Missed folding for comparisions between allocated pointer and global variables/functions
</td>
</tr>
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<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<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 int foo(void);
char a[32] = "hello";
char b[32];
int fa (void)
{
void *p = malloc (32);
return p == foo; // should be folded 0
// return p == f; // should be folded 0
}
int fb (void)
{
void *p = malloc (32);
return p == a; // should be folded 0
}
int fc (void)
{
void *p = malloc (32);
return p == b; // should be folded 0
}
Not sure what is broken here, values from malloc/calloc/etc are tagged as
noalias, so these comparisons should be handled/folded..</pre>
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