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Revert r164763 because it introduces new shuffles.
Thanks Nick Lewycky for pointing this out. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181177 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -984,24 +984,6 @@ Instruction *InstCombiner::visitSelectInst(SelectInst &SI) {
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return &SI;
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}
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if (ConstantVector *CV = dyn_cast<ConstantVector>(CondVal)) {
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// Form a shufflevector instruction.
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SmallVector<Constant *, 8> Mask(VWidth);
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Type *Int32Ty = Type::getInt32Ty(CV->getContext());
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for (unsigned i = 0; i != VWidth; ++i) {
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Constant *Elem = cast<Constant>(CV->getOperand(i));
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if (ConstantInt *E = dyn_cast<ConstantInt>(Elem))
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Mask[i] = ConstantInt::get(Int32Ty, i + (E->isZero() ? VWidth : 0));
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else if (isa<UndefValue>(Elem))
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Mask[i] = UndefValue::get(Int32Ty);
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else
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return 0;
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}
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Constant *MaskVal = ConstantVector::get(Mask);
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Value *V = Builder->CreateShuffleVector(TrueVal, FalseVal, MaskVal);
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return ReplaceInstUsesWith(SI, V);
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}
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if (isa<ConstantAggregateZero>(CondVal)) {
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return ReplaceInstUsesWith(SI, FalseVal);
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}
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@ -196,7 +196,7 @@ define <4 x float> @test_select(float %f, float %g) {
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; CHECK-NOT: insertelement
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; CHECK: %a3 = insertelement <4 x float> %a0, float 3.000000e+00, i32 3
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; CHECK-NOT: insertelement
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; CHECK: shufflevector <4 x float> %a3, <4 x float> <float undef, float 4.000000e+00, float 5.000000e+00, float undef>, <4 x i32> <i32 0, i32 5, i32 6, i32 3>
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; CHECK: %ret = select <4 x i1> <i1 true, i1 false, i1 false, i1 true>, <4 x float> %a3, <4 x float> <float undef, float 4.000000e+00, float 5.000000e+00, float undef>
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%a0 = insertelement <4 x float> undef, float %f, i32 0
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%a1 = insertelement <4 x float> %a0, float 1.000000e+00, i32 1
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%a2 = insertelement <4 x float> %a1, float 2.000000e+00, i32 2
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@ -153,73 +153,3 @@ define <8 x i8> @test12a(<8 x i8> %tmp6, <8 x i8> %tmp2) nounwind {
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ret <8 x i8> %tmp3
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}
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; We should form a shuffle out of a select with constant condition.
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define <4 x i16> @test13a(<4 x i16> %lhs, <4 x i16> %rhs) {
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; CHECK: @test13a
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; CHECK-NEXT: shufflevector <4 x i16> %lhs, <4 x i16> %rhs, <4 x i32> <i32 0, i32 5, i32 2, i32 7>
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; CHECK-NEXT: ret
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%A = select <4 x i1> <i1 true, i1 false, i1 true, i1 false>,
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<4 x i16> %lhs, <4 x i16> %rhs
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ret <4 x i16> %A
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}
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define <4 x i16> @test13b(<4 x i16> %lhs, <4 x i16> %rhs) {
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; CHECK: @test13b
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; CHECK-NEXT: ret <4 x i16> %lhs
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%A = select <4 x i1> <i1 true, i1 undef, i1 true, i1 true>,
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<4 x i16> %lhs, <4 x i16> %rhs
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ret <4 x i16> %A
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}
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define <4 x i16> @test13c(<4 x i16> %lhs, <4 x i16> %rhs) {
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; CHECK: @test13c
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; CHECK-NEXT: shufflevector <4 x i16> %lhs, <4 x i16> %rhs, <4 x i32> <i32 0, i32 undef, i32 2, i32 7>
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; CHECK-NEXT: ret
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%A = select <4 x i1> <i1 true, i1 undef, i1 true, i1 false>,
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<4 x i16> %lhs, <4 x i16> %rhs
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ret <4 x i16> %A
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}
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define <4 x i16> @test13d(<4 x i16> %lhs, <4 x i16> %rhs) {
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; CHECK: @test13d
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; CHECK: select
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; CHECK-NEXT: ret
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%A = select <4 x i1> <i1 true, i1 icmp ugt (<4 x i16>(<4 x i16>, <4 x i16>)* @test13a, <4 x i16>(<4 x i16>, <4 x i16>)* @test13b), i1 true, i1 false>,
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<4 x i16> %lhs, <4 x i16> %rhs
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ret <4 x i16> %A
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}
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define <4 x i16> @test13e(<4 x i16> %lhs, <4 x i16> %rhs) {
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; CHECK: @test13e
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; CHECK-NEXT: ret <4 x i16> %rhs
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%A = select <4 x i1> <i1 false, i1 false, i1 false, i1 false>,
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<4 x i16> %lhs, <4 x i16> %rhs
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ret <4 x i16> %A
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}
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; Check that sequences of insert/extract element are
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; collapsed into shuffle instruction with correct shuffle indexes.
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define <4 x float> @test14a(<4 x float> %LHS, <4 x float> %RHS) {
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; CHECK: @test14a
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; CHECK-NEXT: shufflevector <4 x float> %LHS, <4 x float> %RHS, <4 x i32> <i32 4, i32 0, i32 6, i32 6>
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; CHECK-NEXT: ret <4 x float> %tmp4
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%tmp1 = extractelement <4 x float> %LHS, i32 0
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%tmp2 = insertelement <4 x float> %RHS, float %tmp1, i32 1
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%tmp3 = extractelement <4 x float> %RHS, i32 2
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%tmp4 = insertelement <4 x float> %tmp2, float %tmp3, i32 3
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ret <4 x float> %tmp4
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}
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define <4 x float> @test14b(<4 x float> %LHS, <4 x float> %RHS) {
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; CHECK: @test14b
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; CHECK-NEXT: shufflevector <4 x float> %LHS, <4 x float> %RHS, <4 x i32> <i32 4, i32 3, i32 6, i32 6>
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; CHECK-NEXT: ret <4 x float> %tmp5
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%tmp0 = extractelement <4 x float> %LHS, i32 3
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%tmp1 = insertelement <4 x float> %RHS, float %tmp0, i32 0
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%tmp2 = extractelement <4 x float> %tmp1, i32 0
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%tmp3 = insertelement <4 x float> %RHS, float %tmp2, i32 1
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%tmp4 = extractelement <4 x float> %RHS, i32 2
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%tmp5 = insertelement <4 x float> %tmp3, float %tmp4, i32 3
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ret <4 x float> %tmp5
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}
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