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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [AArch64] Very bad code generation with shuffles and llvm.aarch64.neon.smull.v4i32"
href="https://bugs.llvm.org/show_bug.cgi?id=40632">40632</a>
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<th>Summary</th>
<td>[AArch64] Very bad code generation with shuffles and llvm.aarch64.neon.smull.v4i32
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<th>Product</th>
<td>libraries
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Windows NT
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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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>efriedma@quicinc.com
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<th>CC</th>
<td>arnaud.degrandmaison@arm.com, florian_hahn@apple.com, llvm-bugs@lists.llvm.org, maratek@gmail.com, peter.smith@linaro.org, resistor@mac.com, Ties.Stuij@arm.com
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<pre>#include <arm_neon.h>
int32x4_t f(int32x4_t vacc, int16x8_t vb, int16x8_t va) {
return vmull_lane_s16(vget_low_s16(vb), vget_low_s16(va), 0);
}
Produces:
dup v0.8h, v2.h[0]
ext v0.16b, v0.16b, v0.16b, #8
smull v0.4s, v1.4h, v0.4h
ret
Something is obviously going terribly wrong here.
I'll have a patch soon, I think.</pre>
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