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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Do not know how to split the result of this operator w/ llvm.x86.avx2.gather.q.pd.256"
href="https://bugs.llvm.org/show_bug.cgi?id=42352">42352</a>
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<th>Summary</th>
<td>Do not know how to split the result of this operator w/ llvm.x86.avx2.gather.q.pd.256
</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>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Backend: X86
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>rupprecht@google.com
</td>
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<th>CC</th>
<td>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk, spatel+llvm@rotateright.com
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<p>
<div>
<pre>We're seeing an error that has been reduced to this:
$ cat repro.cc
__attribute__((__vector_size__(4 * sizeof(long)))) long a;
__attribute__((__vector_size__(4 * sizeof(double)))) double b;
struct c {
__attribute__((target("avx2"), always_inline)) int d() {
b = __builtin_ia32_gatherq_pd256(b, 0, a, b, sizeof(double));
return 0;
}
};
void e() {
c f;
f.d();
}
$ clang++ -c repro.cc
SplitVectorResult #0: t13: v4f64,ch = llvm.x86.avx2.gather.q.pd.256<(load 32,
align 1)> t5, TargetConstant:i64<5859>, t8, Constant:i64<0>, t10, t8,
Constant:i8<8>
fatal error: error in backend: Do not know how to split the result of this
operator!
I tried clang++ from trunk, as well as a very old version (clang++-4), and both
failed, so this is not a new bug, unless it was fixed in between and regressed.</pre>
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