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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Crash with length 7 SIMD vectors"
href="https://llvm.org/bugs/show_bug.cgi?id=27708">27708</a>
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<tr>
<th>Summary</th>
<td>Crash with length 7 SIMD vectors
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
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<th>Version</th>
<td>3.8
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>schnetter@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>SIMD vectors of length 7 crash LLVM on x86-64 with AVX2.
This code
{{{
typedef long vlong7 __attribute__((__ext_vector_type__(7)));
vlong7 pvadd7(const vlong7 *restrict x, const vlong7 *restrict y) {
return *x + *y;
}
}}}
leads to this error:
{{{
$ clang -S -march=native -Ofast llvm-simd.c
clang: error: unable to execute command: Segmentation fault: 11
clang: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 3.8.0 (branches/release_38 262722)
Target: x86_64-apple-darwin15.4.0
Thread model: posix
InstalledDir: /opt/local/libexec/llvm-3.8/bin
clang: note: diagnostic msg: PLEASE submit a bug report to
<a href="http://llvm.org/bugs/">http://llvm.org/bugs/</a> and include the crash backtrace, preprocessed source, and
associated run script.
clang: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang: note: diagnostic msg:
/var/folders/gl/zvl8d6415vsbkd50nnll95k40000gs/T/llvm-simd-97992a.c
clang: note: diagnostic msg:
/var/folders/gl/zvl8d6415vsbkd50nnll95k40000gs/T/llvm-simd-97992a.sh
clang: note: diagnostic msg:
********************
}}}
I see similar problems with all vector sizes N>4 && N==2^i-1.
I also see code generations problems (wrong code, i.e. code that calculates
wrong results) for vector sizes N>4 && N%4==3.</pre>
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