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9008ca6b6b
PR2957 ISD::VECTOR_SHUFFLE now stores an array of integers representing the shuffle mask internal to the node, rather than taking a BUILD_VECTOR of ConstantSDNodes as the shuffle mask. A value of -1 represents UNDEF. In addition to eliminating the creation of illegal BUILD_VECTORS just to represent shuffle masks, we are better about canonicalizing the shuffle mask, resulting in substantially better code for some classes of shuffles. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70225 91177308-0d34-0410-b5e6-96231b3b80d8
23 lines
880 B
LLVM
23 lines
880 B
LLVM
; RUN: llvm-as < %s | llc -march=x86 -mattr=sse41 -disable-mmx -o %t -f
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; RUN: grep pshufhw %t | grep 161 | count 1
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; RUN: grep shufps %t | count 1
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; RUN: not grep pslldq %t
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; Test case when creating pshufhw, we incorrectly set the higher order bit
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; for an undef,
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define void @test(<8 x i16>* %dest, <8 x i16> %in) {
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entry:
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%0 = load <8 x i16>* %dest
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%1 = shufflevector <8 x i16> %0, <8 x i16> %in, <8 x i32> < i32 0, i32 1, i32 2, i32 3, i32 13, i32 undef, i32 14, i32 14>
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store <8 x i16> %1, <8 x i16>* %dest
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ret void
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}
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; A test case where we shouldn't generate a punpckldq but a pshufd and a pslldq
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define void @test2(<4 x i32>* %dest, <4 x i32> %in) {
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entry:
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%0 = shufflevector <4 x i32> %in, <4 x i32> <i32 0, i32 0, i32 0, i32 0>, <4 x i32> < i32 undef, i32 5, i32 undef, i32 2>
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store <4 x i32> %0, <4 x i32>* %dest
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ret void
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}
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