https://bugs.llvm.org/show_bug.cgi?id=40632
Bug ID: 40632
Summary: [AArch64] Very bad code generation with shuffles and
llvm.aarch64.neon.smull.v4i32
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: AArch64
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected],
[email protected], [email protected],
[email protected]
#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.
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