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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang crashing on __builtin_assume"
href="https://bugs.llvm.org/show_bug.cgi?id=40940">40940</a>
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<th>Summary</th>
<td>clang crashing on __builtin_assume
</td>
</tr>
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<th>Product</th>
<td>new-bugs
</td>
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<th>Version</th>
<td>8.0
</td>
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<th>Hardware</th>
<td>Other
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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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>new bugs
</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>oiskuu@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=21556" name="attach_21556" title="bugpoint reduction">attachment 21556</a> <a href="attachment.cgi?id=21556&action=edit" title="bugpoint reduction">[details]</a></span>
bugpoint reduction
Clang-8 crash somewhere along computeKnownBits.
Compile with -O -mssse3:
typedef char __v16qi __attribute__((__vector_size__(16)));
typedef long long __m128i __attribute__((__vector_size__(16)));
typedef long long int64_t;
void expand_p6(__m128i *in, __m128i *out)
{
*out = __builtin_ia32_pshufb128(*in, (__v16qi){ 0,1,2,3,4,5,-1,-1,
6,7,8,9,10,11,-1,-1 });
}
int64_t extract_p6(__m128i *in)
{
union { __m128i m; int64_t i[2]; } t;
expand_p6(in, &t.m);
__builtin_assume(!(t.i[0] >> 48));
return t.i[0];
}</pre>
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