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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Crash in instruction selection when using _addcarry_u64 intrinsic"
href="http://llvm.org/bugs/show_bug.cgi?id=22571">22571</a>
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<th>Summary</th>
<td>Crash in instruction selection when using _addcarry_u64 intrinsic
</td>
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Backend: X86
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>sneves@dei.uc.pt
</td>
</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>The following program causes clang (svn228909) to crash during instruction
selection (x86_64 target, -O1 and higher) for add3 but not add2:
#include <immintrin.h>
typedef unsigned long long u64;
void add2(u64 x[4], const u64 y[4]) {
unsigned char cy = 0;
for(int i = 0; i < 4; ++i) {
cy = _addcarry_u64(cy, x[i], y[i], &x[i]);
}
}
void add3(u64 z[4], const u64 x[4], const u64 y[4]) {
unsigned char cy = 0;
for(int i = 0; i < 4; ++i) {
cy = _addcarry_u64(cy, x[i], y[i], &z[i]);
}
}</pre>
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