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24faf611a3
insertp[sd] $0, which is a noop. Before:
_f32: ## @f32
pshufd $1, %xmm1, %xmm2
pshufd $1, %xmm0, %xmm3
addss %xmm2, %xmm3
addss %xmm1, %xmm0
## kill: XMM0<def> XMM0<kill> XMM0<def>
insertps $0, %xmm0, %xmm0
insertps $16, %xmm3, %xmm0
ret
after:
_f32: ## @f32
movdqa %xmm0, %xmm2
addss %xmm1, %xmm2
pshufd $1, %xmm1, %xmm1
pshufd $1, %xmm0, %xmm3
addss %xmm1, %xmm3
movdqa %xmm2, %xmm0
insertps $16, %xmm3, %xmm0
ret
The extra movs are due to a random (poor) scheduling decision.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112379 91177308-0d34-0410-b5e6-96231b3b80d8
10 lines
347 B
LLVM
10 lines
347 B
LLVM
; RUN: llc < %s -march=x86 -mattr=+sse41 > %t
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; RUN: grep pinsrd %t | count 1
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define <4 x i32> @var_insert2(<4 x i32> %x, i32 %val, i32 %idx) nounwind {
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entry:
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%tmp3 = insertelement <4 x i32> undef, i32 %val, i32 0 ; <<4 x i32>> [#uses=1]
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%tmp4 = insertelement <4 x i32> %tmp3, i32 %idx, i32 3 ; <<4 x i32>> [#uses=1]
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ret <4 x i32> %tmp4
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}
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