[ARM64] Fix a bug in shuffle vector lowering to generate corect vext ISD with swapped input vectors.
llvm-svn: 209495
This commit is contained in:
Jiangning Liu
parent
25ea6a1b8e
commit
4b5b757d65
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@ -4270,23 +4270,22 @@ static bool isEXTMask(ArrayRef<int> M, EVT VT, bool &ReverseEXT,
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// The index of an EXT is the first element if it is not UNDEF.
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// Watch out for the beginning UNDEFs. The EXT index should be the expected
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// value of the first element.
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// E.g. <-1, -1, 3, ...> is treated as <1, 2, 3, ...>.
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// <-1, -1, 0, 1, ...> is treated as <IDX, IDX+1, 0, 1, ...>. IDX is
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// equal to the ExpectedElt.
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Imm = (M[0] >= 0) ? static_cast<unsigned>(M[0]) : ExpectedElt.getZExtValue();
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// value of the first element. E.g.
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// <-1, -1, 3, ...> is treated as <1, 2, 3, ...>.
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// <-1, -1, 0, 1, ...> is treated as <2*NumElts-2, 2*NumElts-1, 0, 1, ...>.
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// ExpectedElt is the last mask index plus 1.
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Imm = ExpectedElt.getZExtValue();
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// If no beginning UNDEFs, do swap when M[0] >= NumElts.
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if (M[0] >= 0 && Imm >= NumElts) {
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// There are two difference cases requiring to reverse input vectors.
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// For example, for vector <4 x i32> we have the following cases,
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// Case 1: shufflevector(<4 x i32>,<4 x i32>,<-1, -1, -1, 0>)
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// Case 2: shufflevector(<4 x i32>,<4 x i32>,<-1, -1, 7, 0>)
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// For both cases, we finally use mask <5, 6, 7, 0>, which requires
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// to reverse two input vectors.
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if (Imm < NumElts)
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ReverseEXT = true;
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else
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Imm -= NumElts;
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} else if (M[0] < 0) {
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// Only do swap when beginning UNDEFs more than the first real element,
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if (*FirstRealElt < FirstRealElt - M.begin())
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ReverseEXT = true;
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if (Imm >= NumElts)
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Imm -= NumElts;
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}
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return true;
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}
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@ -0,0 +1,172 @@
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; RUN: llc -mtriple=arm64-linux-gnuabi < %s | FileCheck %s
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; The following tests is to check the correctness of reversing input operand
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; of vext by enumerating all cases of using two undefs in shuffle masks.
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define <4 x i16> @vext_6701_0(<4 x i16> %a1, <4 x i16> %a2) {
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entry:
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; CHECK-LABEL: vext_6701_0:
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; CHECK: ext v0.8b, v1.8b, v0.8b, #4
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%x = shufflevector <4 x i16> %a1, <4 x i16> %a2, <4 x i32> <i32 6, i32 7, i32 0, i32 1>
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ret <4 x i16> %x
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}
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define <4 x i16> @vext_6701_12(<4 x i16> %a1, <4 x i16> %a2) {
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entry:
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; CHECK-LABEL: vext_6701_12:
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; CHECK: ext v0.8b, v0.8b, v0.8b, #4
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%x = shufflevector <4 x i16> %a1, <4 x i16> %a2, <4 x i32> <i32 undef, i32 undef, i32 0, i32 1>
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ret <4 x i16> %x
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}
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define <4 x i16> @vext_6701_13(<4 x i16> %a1, <4 x i16> %a2) {
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entry:
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; CHECK-LABEL: vext_6701_13:
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; CHECK: ext v0.8b, v1.8b, v0.8b, #4
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%x = shufflevector <4 x i16> %a1, <4 x i16> %a2, <4 x i32> <i32 undef, i32 7, i32 undef, i32 1>
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ret <4 x i16> %x
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}
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define <4 x i16> @vext_6701_14(<4 x i16> %a1, <4 x i16> %a2) {
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entry:
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; CHECK-LABEL: vext_6701_14:
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; CHECK: ext v0.8b, v1.8b, v0.8b, #4
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%x = shufflevector <4 x i16> %a1, <4 x i16> %a2, <4 x i32> <i32 undef, i32 7, i32 0, i32 undef>
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ret <4 x i16> %x
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}
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define <4 x i16> @vext_6701_23(<4 x i16> %a1, <4 x i16> %a2) {
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entry:
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; CHECK-LABEL: vext_6701_23:
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; CHECK: ext v0.8b, v1.8b, v0.8b, #4
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%x = shufflevector <4 x i16> %a1, <4 x i16> %a2, <4 x i32> <i32 6, i32 undef, i32 undef, i32 1>
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ret <4 x i16> %x
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}
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define <4 x i16> @vext_6701_24(<4 x i16> %a1, <4 x i16> %a2) {
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entry:
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; CHECK-LABEL: vext_6701_24:
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; CHECK: ext v0.8b, v1.8b, v0.8b, #4
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%x = shufflevector <4 x i16> %a1, <4 x i16> %a2, <4 x i32> <i32 6, i32 undef, i32 0, i32 undef>
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ret <4 x i16> %x
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}
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define <4 x i16> @vext_6701_34(<4 x i16> %a1, <4 x i16> %a2) {
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entry:
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; CHECK-LABEL: vext_6701_34:
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; CHECK: ext v0.8b, v1.8b, v0.8b, #4
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%x = shufflevector <4 x i16> %a1, <4 x i16> %a2, <4 x i32> <i32 6, i32 7, i32 undef, i32 undef>
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ret <4 x i16> %x
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}
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define <4 x i16> @vext_5670_0(<4 x i16> %a1, <4 x i16> %a2) {
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entry:
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; CHECK-LABEL: vext_5670_0:
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; CHECK: ext v0.8b, v1.8b, v0.8b, #2
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%x = shufflevector <4 x i16> %a1, <4 x i16> %a2, <4 x i32> <i32 5, i32 6, i32 7, i32 0>
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ret <4 x i16> %x
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}
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define <4 x i16> @vext_5670_12(<4 x i16> %a1, <4 x i16> %a2) {
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entry:
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; CHECK-LABEL: vext_5670_12:
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; CHECK: ext v0.8b, v1.8b, v0.8b, #2
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%x = shufflevector <4 x i16> %a1, <4 x i16> %a2, <4 x i32> <i32 undef, i32 undef, i32 7, i32 0>
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ret <4 x i16> %x
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}
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define <4 x i16> @vext_5670_13(<4 x i16> %a1, <4 x i16> %a2) {
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entry:
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; CHECK-LABEL: vext_5670_13:
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; CHECK: ext v0.8b, v1.8b, v0.8b, #2
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%x = shufflevector <4 x i16> %a1, <4 x i16> %a2, <4 x i32> <i32 undef, i32 6, i32 undef, i32 0>
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ret <4 x i16> %x
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}
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define <4 x i16> @vext_5670_14(<4 x i16> %a1, <4 x i16> %a2) {
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entry:
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; CHECK-LABEL: vext_5670_14:
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; CHECK: ext v0.8b, v1.8b, v0.8b, #2
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%x = shufflevector <4 x i16> %a1, <4 x i16> %a2, <4 x i32> <i32 undef, i32 6, i32 7, i32 undef>
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ret <4 x i16> %x
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}
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define <4 x i16> @vext_5670_23(<4 x i16> %a1, <4 x i16> %a2) {
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entry:
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; CHECK-LABEL: vext_5670_23:
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; CHECK: ext v0.8b, v1.8b, v0.8b, #2
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%x = shufflevector <4 x i16> %a1, <4 x i16> %a2, <4 x i32> <i32 5, i32 undef, i32 undef, i32 0>
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ret <4 x i16> %x
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}
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define <4 x i16> @vext_5670_24(<4 x i16> %a1, <4 x i16> %a2) {
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entry:
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; CHECK-LABEL: vext_5670_24:
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; CHECK: rev32 v0.4h, v1.4h
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%x = shufflevector <4 x i16> %a1, <4 x i16> %a2, <4 x i32> <i32 5, i32 undef, i32 7, i32 undef>
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ret <4 x i16> %x
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}
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define <4 x i16> @vext_5670_34(<4 x i16> %a1, <4 x i16> %a2) {
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entry:
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; CHECK-LABEL: vext_5670_34:
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; CHECK: ext v0.8b, v1.8b, v0.8b, #2
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%x = shufflevector <4 x i16> %a1, <4 x i16> %a2, <4 x i32> <i32 5, i32 6, i32 undef, i32 undef>
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ret <4 x i16> %x
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}
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define <4 x i16> @vext_7012_0(<4 x i16> %a1, <4 x i16> %a2) {
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entry:
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; CHECK-LABEL: vext_7012_0:
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; CHECK: ext v0.8b, v1.8b, v0.8b, #6
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%x = shufflevector <4 x i16> %a1, <4 x i16> %a2, <4 x i32> <i32 7, i32 0, i32 1, i32 2>
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ret <4 x i16> %x
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}
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define <4 x i16> @vext_7012_12(<4 x i16> %a1, <4 x i16> %a2) {
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entry:
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; CHECK-LABEL: vext_7012_12:
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; CHECK: ext v0.8b, v0.8b, v0.8b, #6
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%x = shufflevector <4 x i16> %a1, <4 x i16> %a2, <4 x i32> <i32 undef, i32 undef, i32 1, i32 2>
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ret <4 x i16> %x
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}
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define <4 x i16> @vext_7012_13(<4 x i16> %a1, <4 x i16> %a2) {
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entry:
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; CHECK-LABEL: vext_7012_13:
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; CHECK: rev32 v0.4h, v0.4h
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%x = shufflevector <4 x i16> %a1, <4 x i16> %a2, <4 x i32> <i32 undef, i32 0, i32 undef, i32 2>
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ret <4 x i16> %x
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}
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define <4 x i16> @vext_7012_14(<4 x i16> %a1, <4 x i16> %a2) {
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entry:
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; CHECK-LABEL: vext_7012_14:
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; CHECK: ext v0.8b, v0.8b, v0.8b, #6
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%x = shufflevector <4 x i16> %a1, <4 x i16> %a2, <4 x i32> <i32 undef, i32 0, i32 1, i32 undef>
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ret <4 x i16> %x
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}
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define <4 x i16> @vext_7012_23(<4 x i16> %a1, <4 x i16> %a2) {
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entry:
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; CHECK-LABEL: vext_7012_23:
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; CHECK: ext v0.8b, v1.8b, v0.8b, #6
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%x = shufflevector <4 x i16> %a1, <4 x i16> %a2, <4 x i32> <i32 7, i32 undef, i32 undef, i32 2>
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ret <4 x i16> %x
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}
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define <4 x i16> @vext_7012_24(<4 x i16> %a1, <4 x i16> %a2) {
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entry:
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; CHECK-LABEL: vext_7012_24:
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; CHECK: ext v0.8b, v1.8b, v0.8b, #6
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%x = shufflevector <4 x i16> %a1, <4 x i16> %a2, <4 x i32> <i32 7, i32 undef, i32 1, i32 undef>
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ret <4 x i16> %x
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}
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define <4 x i16> @vext_7012_34(<4 x i16> %a1, <4 x i16> %a2) {
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entry:
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; CHECK-LABEL: vext_7012_34:
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; CHECK: ext v0.8b, v1.8b, v0.8b, #6
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%x = shufflevector <4 x i16> %a1, <4 x i16> %a2, <4 x i32> <i32 7, i32 0, i32 undef, i32 undef>
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ret <4 x i16> %x
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}
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