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Support for the special case of a vector with the canonical form:
vector_shuffle v1, v2, <2, 6, 3, 7> I.e. vector_shuffle v, undef, <2, 2, 3, 3> MMX only has a shuffle for v4i16 vectors. It needs to use the unpackh for this type of operation. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36403 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -379,6 +379,8 @@ X86TargetLowering::X86TargetLowering(TargetMachine &TM)
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setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v8i8, Custom);
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setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v4i16, Custom);
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setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v2i32, Custom);
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setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v1i64, Custom);
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}
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if (Subtarget->hasSSE1()) {
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@ -1776,7 +1778,7 @@ bool X86::isUNPCKL_v_undef_Mask(SDNode *N) {
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assert(N->getOpcode() == ISD::BUILD_VECTOR);
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unsigned NumElems = N->getNumOperands();
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if (NumElems != 4 && NumElems != 8 && NumElems != 16)
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if (NumElems != 2 && NumElems != 4 && NumElems != 8 && NumElems != 16)
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return false;
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for (unsigned i = 0, j = 0; i != NumElems; i += 2, ++j) {
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@ -1792,6 +1794,29 @@ bool X86::isUNPCKL_v_undef_Mask(SDNode *N) {
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return true;
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}
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/// isUNPCKH_v_undef_Mask - Special case of isUNPCKHMask for canonical form
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/// of vector_shuffle v, v, <2, 6, 3, 7>, i.e. vector_shuffle v, undef,
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/// <2, 2, 3, 3>
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bool X86::isUNPCKH_v_undef_Mask(SDNode *N) {
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assert(N->getOpcode() == ISD::BUILD_VECTOR);
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unsigned NumElems = N->getNumOperands();
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if (NumElems != 2 && NumElems != 4 && NumElems != 8 && NumElems != 16)
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return false;
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for (unsigned i = 0, j = NumElems / 2; i != NumElems; i += 2, ++j) {
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SDOperand BitI = N->getOperand(i);
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SDOperand BitI1 = N->getOperand(i + 1);
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if (!isUndefOrEqual(BitI, j))
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return false;
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if (!isUndefOrEqual(BitI1, j))
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return false;
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}
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return true;
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}
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/// isMOVLMask - Return true if the specified VECTOR_SHUFFLE operand
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/// specifies a shuffle of elements that is suitable for input to MOVSS,
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/// MOVSD, and MOVD, i.e. setting the lowest element.
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@ -2432,7 +2457,7 @@ X86TargetLowering::LowerBUILD_VECTOR(SDOperand Op, SelectionDAG &DAG) {
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}
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}
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// Let legalizer expand 2-wide build_vector's.
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// Let legalizer expand 2-wide build_vectors.
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if (EVTBits == 64)
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return SDOperand();
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@ -2591,6 +2616,7 @@ X86TargetLowering::LowerVECTOR_SHUFFLE(SDOperand Op, SelectionDAG &DAG) {
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}
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if (X86::isUNPCKL_v_undef_Mask(PermMask.Val) ||
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X86::isUNPCKH_v_undef_Mask(PermMask.Val) ||
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X86::isUNPCKLMask(PermMask.Val) ||
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X86::isUNPCKHMask(PermMask.Val))
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return Op;
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@ -2619,6 +2645,7 @@ X86TargetLowering::LowerVECTOR_SHUFFLE(SDOperand Op, SelectionDAG &DAG) {
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// Commute is back and try unpck* again.
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Op = CommuteVectorShuffle(Op, V1, V2, PermMask, DAG);
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if (X86::isUNPCKL_v_undef_Mask(PermMask.Val) ||
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X86::isUNPCKH_v_undef_Mask(PermMask.Val) ||
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X86::isUNPCKLMask(PermMask.Val) ||
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X86::isUNPCKHMask(PermMask.Val))
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return Op;
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@ -4231,6 +4258,7 @@ X86TargetLowering::isShuffleMaskLegal(SDOperand Mask, MVT::ValueType VT) const {
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isPSHUFHW_PSHUFLWMask(Mask.Val) ||
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X86::isUNPCKLMask(Mask.Val) ||
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X86::isUNPCKL_v_undef_Mask(Mask.Val) ||
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X86::isUNPCKH_v_undef_Mask(Mask.Val) ||
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X86::isUNPCKHMask(Mask.Val));
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}
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@ -231,6 +231,11 @@ namespace llvm {
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/// <0, 0, 1, 1>
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bool isUNPCKL_v_undef_Mask(SDNode *N);
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/// isUNPCKH_v_undef_Mask - Special case of isUNPCKHMask for canonical form
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/// of vector_shuffle v, v, <2, 6, 3, 7>, i.e. vector_shuffle v, undef,
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/// <2, 2, 3, 3>
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bool isUNPCKH_v_undef_Mask(SDNode *N);
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/// isMOVLMask - Return true if the specified VECTOR_SHUFFLE operand
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/// specifies a shuffle of elements that is suitable for input to MOVSS,
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/// MOVSD, and MOVD, i.e. setting the lowest element.
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