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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - LLVM fails to DCE constant-folded calls to math functions"
href="https://llvm.org/bugs/show_bug.cgi?id=30464">30464</a>
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<th>Summary</th>
<td>LLVM fails to DCE constant-folded calls to math functions
</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>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Scalar Optimizations
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>efriedma@codeaurora.org
</td>
</tr>
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<th>CC</th>
<td>david.majnemer@gmail.com, llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Testcase:
#include <math.h>
void f() { exp(1.0); }
On x86-64 Linux, clang -O2 doesn't eliminate the call to exp(). (LLVM can
prove it's dead even with -fmath-errno because the result doesn't overflow.)
I think this is a regression from r276389.</pre>
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