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2f8a6cdfa3
pmuludq is slow, but it turns out that all the unpacking and packing of the scalarized mul is even slower. 10% speedup on loop-vectorized paq8p. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170985 91177308-0d34-0410-b5e6-96231b3b80d8
15 lines
307 B
LLVM
15 lines
307 B
LLVM
; RUN: llc < %s -march=x86-64 -mcpu=core2 | FileCheck %s
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define <4 x i32> @test1(<4 x i32> %x, <4 x i32> %y) {
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%m = mul <4 x i32> %x, %y
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ret <4 x i32> %m
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; CHECK: test1:
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; CHECK: pshufd $49
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; CHECK: pmuludq
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; CHECK: pshufd $49
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; CHECK: pmuludq
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; CHECK: shufps $-120
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; CHECK: pshufd $-40
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; CHECK: ret
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}
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