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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - PowerPC: SelectBitfieldInsert is buggy"
href="https://llvm.org/bugs/show_bug.cgi?id=24719">24719</a>
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</tr>
<tr>
<th>Summary</th>
<td>PowerPC: SelectBitfieldInsert is buggy
</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>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Backend: PowerPC
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>anton@samba.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The following testcase:
#include <stdio.h>
int a;
int d = 15;
int *b = &d;
signed char fn1(int p1, int p2)
{
return p1 >> p2;
}
int main(void)
{
char c;
for (c = 0; c < 2; c++) {
unsigned int d = 2072;
*b |= d <= fn1(d, !a);
}
printf("%d\n", *b);
return 0;
}
built with -O1 prints 15, but built with -O2 prints 0.
My guess is SelectBitfieldInsert has issues, perhaps similar to PR24704.</pre>
</div>
</p>
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