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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Incorrect predication in SKX, opt-bisect blames SLP Vectorizer"
href="https://bugs.llvm.org/show_bug.cgi?id=34959">34959</a>
</td>
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<th>Summary</th>
<td>Incorrect predication in SKX, opt-bisect blames SLP Vectorizer
</td>
</tr>
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<th>Product</th>
<td>new-bugs
</td>
</tr>
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<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>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>new bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>babokin@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>clang trunk, rev315775, x86_64.
This may be duplication of #34665, but I failed to reduce the test to integer
types, so it seems to be different.
<span class="quote">> cat x.cpp</span >
#include <stdio.h>
long double a = 2;
double b = 0.0;
float c = 0.670000f;
float f = 0.0;
double d = 0.0;
double e = 0.0;
int main() {
long double result = (a*0.5f ? (0.890000f + b ? (a ? c : 0) : 0) : 0 * d ?:
0.500000f) *
(a*0.5f ? (0.890000f + b ? (a ? c : 0) : 0) : e * 0 ?: f);
printf("%Lf\n", result);
}
<span class="quote">> clang++ x.cpp -O0 -march=skx -o out; ./out</span >
0.448900
<span class="quote">> clang++ x.cpp -O2 -march=skx -o out; ./out</span >
0.000000</pre>
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