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<body><span class="vcard"><a class="email" href="mailto:spatel+llvm@rotateright.com" title="Sanjay Patel <spatel+llvm@rotateright.com>"> <span class="fn">Sanjay Patel</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Vectorizer produces wrong code (div by zero)"
href="https://llvm.org/bugs/show_bug.cgi?id=17854">bug 17854</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
</tr>
<tr>
<td style="text-align:right;">CC</td>
<td>
</td>
<td>spatel+llvm@rotateright.com
</td>
</tr>
<tr>
<td style="text-align:right;">See Also</td>
<td>
</td>
<td>https://llvm.org/bugs/show_bug.cgi?id=25572, https://llvm.org/bugs/show_bug.cgi?id=8100, https://llvm.org/bugs/show_bug.cgi?id=6050
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<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>INVALID
</td>
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<p>
<div>
<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Vectorizer produces wrong code (div by zero)"
href="https://llvm.org/bugs/show_bug.cgi?id=17854#c5">Comment # 5</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Vectorizer produces wrong code (div by zero)"
href="https://llvm.org/bugs/show_bug.cgi?id=17854">bug 17854</a>
from <span class="vcard"><a class="email" href="mailto:spatel+llvm@rotateright.com" title="Sanjay Patel <spatel+llvm@rotateright.com>"> <span class="fn">Sanjay Patel</span></a>
</span></b>
<pre>The program has undefined behavior because it uses feenableexcept() without
#pragma STDC FENV_ACCESS ON. If there's no warning for that, that seems like a
worthy but different bug.
See <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - SIGFPE received when a program is compiled with Clang but not with GCC"
href="show_bug.cgi?id=25572#c5">bug 25572, comment 5</a> for more details about the pragma.
Clang doesn't support changing the FP env (<a class="bz_bug_link
bz_status_NEW "
title="NEW --- - clang/llvm don't support C99 FP rounding mode pragmas (FENV_ACCESS etc)"
href="show_bug.cgi?id=8100">bug 8100</a>), so it assumes that FP ops
have no side effects (<a class="bz_bug_link
bz_status_NEW "
title="NEW --- - floating-point operations have side effects"
href="show_bug.cgi?id=6050">bug 6050</a>).
...but there's some hope this will improve:
<a href="http://reviews.llvm.org/D14067">http://reviews.llvm.org/D14067</a></pre>
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