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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - LLVM 12 regression: AArch64 backend generates incorrect code for ashr <i8 x 16>"
href="https://bugs.llvm.org/show_bug.cgi?id=49904">49904</a>
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<th>Summary</th>
<td>LLVM 12 regression: AArch64 backend generates incorrect code for ashr <i8 x 16>
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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>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Backend: AArch64
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>amanieu@gmail.com
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<th>CC</th>
<td>arnaud.degrandmaison@arm.com, llvm-bugs@lists.llvm.org, smithp352@googlemail.com, Ties.Stuij@arm.com
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<p>
<div>
<pre>IR:
define <16 x i8> @simd_ashr(<16 x i8> %a, <16 x i8> %b) {
start:
%0 = ashr <16 x i8> %a, %b
ret <16 x i8> %0
}
llc -march=aarch64 -global-isel=1 -O0 test.ll
simd_ashr: // @simd_ashr
// %bb.0: // %start
neg v1.8h, v1.8h
sshl v0.16b, v0.16b, v1.16b
ret
The neg instruction should be using .16b instead of .8h.</pre>
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