https://bugs.llvm.org/show_bug.cgi?id=50603
Bug ID: 50603
Summary: Suboptimal codegen for vector pattern M < 0 ? X : Y
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected],
[email protected]
typedef int V __attribute__((vector_size(16)));
V lt_zero_x_y(V mask, V x, V y) { return mask < 0 ? x : y; }
GCC 9+ -O3 -mavx512f
lt_zero_x_y(int __vector(4), int __vector(4), int __vector(4)):
vblendvps xmm0, xmm2, xmm1, xmm0
ret
LLVM -O3 -mavx512f
lt_zero_x_y(int __vector(4), int __vector(4), int __vector(4)): #
@lt_zero_x_y(int __vector(4), int __vector(4), int __vector(4))
vpcmpeqd xmm3, xmm3, xmm3
vpcmpgtd k1, zmm0, zmm3
vpblendmd zmm0 {k1}, zmm1, zmm2
vzeroupper
ret
https://godbolt.org/z/W9fshMoao
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