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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - llvm::SelectionDAGISel crash when using __builtin_copysign() with -march=armv8-a+nosimd"
href="https://bugs.llvm.org/show_bug.cgi?id=51806">51806</a>
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<th>Summary</th>
<td>llvm::SelectionDAGISel crash when using __builtin_copysign() with -march=armv8-a+nosimd
</td>
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<th>Product</th>
<td>new-bugs
</td>
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<th>Version</th>
<td>12.0
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<th>Hardware</th>
<td>All
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>new bugs
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>luc.vanoostenryck@gmail.com
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>See <a href="https://gcc.godbolt.org/z/917z95e7W">https://gcc.godbolt.org/z/917z95e7W</a>
$ cat crash.c
double crash(double a, double b)
{
return __builtin_copysign(a, b);
}
$ clang -O2 -march=armv8-a+nosimd --target=arm64 -S crash.c -o /dev/null
fatal error: error in backend: Cannot select: 0x7fae361bb4e8: v2i64 =
AArch64ISD::BIT 0x7fae361bb210, 0x7fae361bb278, 0x7fae361bb480
...
Others FP related builtins doesn't seem to have problems with nosimd.</pre>
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