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Clean up normalization of shuffles 

llvm-svn: 59792
This commit is contained in:
Mon P Wang 2008-11-21 04:25:21 +00:00
parent 9ecea26443
commit c311360909
1 changed files with 31 additions and 30 deletions
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61
llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
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@ -2304,18 +2304,17 @@ static bool SequentialMask(SDValue Mask, unsigned SIndx) {
}
void SelectionDAGLowering::visitShuffleVector(User &I) {
SDValue Srcs[2];
Srcs[0] = getValue(I.getOperand(0));
Srcs[1] = getValue(I.getOperand(1));
SDValue Src1 = getValue(I.getOperand(0));
SDValue Src2 = getValue(I.getOperand(1));
SDValue Mask = getValue(I.getOperand(2));
MVT VT = TLI.getValueType(I.getType());
MVT SrcVT = Srcs[0].getValueType();
MVT SrcVT = Src1.getValueType();
int MaskNumElts = Mask.getNumOperands();
int SrcNumElts = SrcVT.getVectorNumElements();
if (SrcNumElts == MaskNumElts) {
setValue(&I, DAG.getNode(ISD::VECTOR_SHUFFLE, VT, Srcs[0], Srcs[1], Mask));
setValue(&I, DAG.getNode(ISD::VECTOR_SHUFFLE, VT, Src1, Src2, Mask));
return;
}
@ -2325,10 +2324,10 @@ void SelectionDAGLowering::visitShuffleVector(User &I) {
if (SrcNumElts < MaskNumElts && MaskNumElts % SrcNumElts == 0) {
// Mask is longer than the source vectors and is a multiple of the source
// vectors. We can use concatenate vector to make the mask and vectors
// length match.
// lengths match.
if (SrcNumElts*2 == MaskNumElts && SequentialMask(Mask, 0)) {
// The shuffle is concatenating two vectors together.
setValue(&I, DAG.getNode(ISD::CONCAT_VECTORS, VT, Srcs[0], Srcs[1]));
setValue(&I, DAG.getNode(ISD::CONCAT_VECTORS, VT, Src1, Src2));
return;
}
@ -2336,16 +2335,20 @@ void SelectionDAGLowering::visitShuffleVector(User &I) {
unsigned NumConcat = MaskNumElts / SrcNumElts;
SDValue UndefVal = DAG.getNode(ISD::UNDEF, SrcVT);
SmallVector<SDValue, 8> MOps1, MOps2;
MOps1.push_back(Srcs[0]);
MOps2.push_back(Srcs[1]);
SDValue* MOps1 = new SDValue[NumConcat];
SDValue* MOps2 = new SDValue[NumConcat];
MOps1[0] = Src1;
MOps2[0] = Src2;
for (unsigned i = 1; i != NumConcat; ++i) {
MOps1.push_back(UndefVal);
MOps2.push_back(UndefVal);
MOps1[i] = UndefVal;
MOps2[i] = UndefVal;
}
Srcs[0] = DAG.getNode(ISD::CONCAT_VECTORS, VT, &MOps1[0], MOps1.size());
Srcs[1] = DAG.getNode(ISD::CONCAT_VECTORS, VT, &MOps2[0], MOps2.size());
Src1 = DAG.getNode(ISD::CONCAT_VECTORS, VT, MOps1, NumConcat);
Src2 = DAG.getNode(ISD::CONCAT_VECTORS, VT, MOps2, NumConcat);
delete [] MOps1;
delete [] MOps2;
// Readjust mask for new input vector length.
SmallVector<SDValue, 8> MappedOps;
for (int i = 0; i != MaskNumElts; ++i) {
@ -2363,7 +2366,7 @@ void SelectionDAGLowering::visitShuffleVector(User &I) {
Mask = DAG.getNode(ISD::BUILD_VECTOR, Mask.getValueType(),
&MappedOps[0], MappedOps.size());
setValue(&I, DAG.getNode(ISD::VECTOR_SHUFFLE, VT, Srcs[0], Srcs[1], Mask));
setValue(&I, DAG.getNode(ISD::VECTOR_SHUFFLE, VT, Src1, Src2, Mask));
return;
}
@ -2371,13 +2374,13 @@ void SelectionDAGLowering::visitShuffleVector(User &I) {
// Resulting vector is shorter than the incoming vector.
if (SrcNumElts == MaskNumElts && SequentialMask(Mask,0)) {
// Shuffle extracts 1st vector.
setValue(&I, Srcs[0]);
setValue(&I, Src1);
return;
}
if (SrcNumElts == MaskNumElts && SequentialMask(Mask,MaskNumElts)) {
// Shuffle extracts 2nd vector.
setValue(&I, Srcs[1]);
setValue(&I, Src2);
return;
}
@ -2406,7 +2409,7 @@ void SelectionDAGLowering::visitShuffleVector(User &I) {
// Check if the access is smaller than the vector size and can we find
// a reasonable extract index.
int RangeUse[2]; // 0 = Unused, 1 = Extract, 2 = Can not Extract.
int RangeUse[2] = { 2, 2 }; // 0 = Unused, 1 = Extract, 2 = Can not Extract.
int StartIdx[2]; // StartIdx to extract from
for (int Input=0; Input < 2; ++Input) {
if (MinRange[Input] == SrcNumElts+1 && MaxRange[Input] == -1) {
@ -2414,7 +2417,7 @@ void SelectionDAGLowering::visitShuffleVector(User &I) {
StartIdx[Input] = 0;
} else if (MaxRange[Input] - MinRange[Input] < MaskNumElts) {
// Fits within range but we should see if we can find a good
// start index that a multiple of the mask length.
// start index that is a multiple of the mask length.
if (MaxRange[Input] < MaskNumElts) {
RangeUse[Input] = 1; // Extract from beginning of the vector
StartIdx[Input] = 0;
@ -2422,11 +2425,8 @@ void SelectionDAGLowering::visitShuffleVector(User &I) {
StartIdx[Input] = (MinRange[Input]/MaskNumElts)*MaskNumElts;
if (MaxRange[Input] - StartIdx[Input] < MaskNumElts)
RangeUse[Input] = 1; // Extract from a multiple of the mask length.
else
RangeUse[Input] = 2; // Can not extract
}
} else
RangeUse[Input] = 2; // Access doesn't fit within range
}
}
if (RangeUse[0] == 0 && RangeUse[0] == 0) {
@ -2436,11 +2436,12 @@ void SelectionDAGLowering::visitShuffleVector(User &I) {
else if (RangeUse[0] < 2 && RangeUse[1] < 2) {
// Extract appropriate subvector and generate a vector shuffle
for (int Input=0; Input < 2; ++Input) {
SDValue& Src = Input == 0 ? Src1 : Src2;
if (RangeUse[Input] == 0) {
Srcs[Input] = DAG.getNode(ISD::UNDEF, VT);
Src = DAG.getNode(ISD::UNDEF, VT);
} else {
Srcs[Input] = DAG.getNode(ISD::EXTRACT_SUBVECTOR, VT, Srcs[Input],
DAG.getIntPtrConstant(StartIdx[Input]));
Src = DAG.getNode(ISD::EXTRACT_SUBVECTOR, VT, Src,
DAG.getIntPtrConstant(StartIdx[Input]));
}
}
// Calculate new mask.
@ -2461,7 +2462,7 @@ void SelectionDAGLowering::visitShuffleVector(User &I) {
}
Mask = DAG.getNode(ISD::BUILD_VECTOR, Mask.getValueType(),
&MappedOps[0], MappedOps.size());
setValue(&I, DAG.getNode(ISD::VECTOR_SHUFFLE, VT, Srcs[0], Srcs[1], Mask));
setValue(&I, DAG.getNode(ISD::VECTOR_SHUFFLE, VT, Src1, Src2, Mask));
return;
}
}
@ -2480,10 +2481,10 @@ void SelectionDAGLowering::visitShuffleVector(User &I) {
assert(isa<ConstantSDNode>(Arg) && "Invalid VECTOR_SHUFFLE mask!");
int Idx = cast<ConstantSDNode>(Arg)->getZExtValue();
if (Idx < SrcNumElts)
Ops.push_back(DAG.getNode(ISD::EXTRACT_VECTOR_ELT, EltVT, Srcs[0],
Ops.push_back(DAG.getNode(ISD::EXTRACT_VECTOR_ELT, EltVT, Src1,
DAG.getConstant(Idx, PtrVT)));
else
Ops.push_back(DAG.getNode(ISD::EXTRACT_VECTOR_ELT, EltVT, Srcs[1],
Ops.push_back(DAG.getNode(ISD::EXTRACT_VECTOR_ELT, EltVT, Src2,
DAG.getConstant(Idx - SrcNumElts, PtrVT)));
}
}