<html>
<head>
<base href="https://llvm.org/bugs/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - target attribute doesn't know about avx512vl, can cause compiler crashes"
href="https://llvm.org/bugs/show_bug.cgi?id=27779">27779</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>target attribute doesn't know about avx512vl, can cause compiler crashes
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>LLVM Codegen
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>nicolasweber@gmx.de
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>thakis@thakis:~/src/llvm-build$ cat test.cc
#include <x86intrin.h>
__attribute__((target("avx512vl"))) void f_avx512() {
__mmask8 mask;
__m256i m;
_mm256_mask_abs_epi32(m, mask, m);
}
void f() {}
int main() {
if (__builtin_cpu_supports("avx512vl"))
f_avx512();
}
thakis@thakis:~/src/llvm-build$ bin/clang -c test.cc
test.cc:10:7: error: invalid cpu feature string for builtin
if (__builtin_cpu_supports("avx512vl"))
^ ~~~~~~~~~~
1 error generated.
If I change the argument to __builtin_cpu_supports to e.g. "avx", then clang
crashes:
thakis@thakis:~/src/llvm-build$ cat test.cc
#include <x86intrin.h>
__attribute__((target("avx512vl"))) void f_avx512() {
__mmask8 mask;
__m256i m;
_mm256_mask_abs_epi32(m, mask, m);
}
void f() {}
int main() {
if (__builtin_cpu_supports("avx"))
f_avx512();
}
thakis@thakis:~/src/llvm-build$ bin/clang -c test.cc
fatal error: error in backend: Cannot select: t19: ch = store<ST32[%5]> t15,
t35, FrameIndex:i64<4>, undef:i64
t35: v32i8 = bitcast t34
t34: v4i64,ch = load<LD32[%6]> t15, FrameIndex:i64<7>, undef:i64
t7: i64 = FrameIndex<7>
t3: i64 = undef
t17: i64 = FrameIndex<4>
t3: i64 = undef
In function: _Z8f_avx512v
clang-3.8: error: clang frontend command failed with exit code 70 (use -v to
see invocation)
clang version 3.9.0 (trunk 268802)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/google/home/thakis/src/llvm-build/bin
clang-3.8: 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-3.8: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-3.8: note: diagnostic msg: /tmp/test-8869f8.cpp
clang-3.8: note: diagnostic msg: /tmp/test-8869f8.sh
clang-3.8: note: diagnostic msg:
********************</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>