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Add vselect target support for targets that do not support blend but do support

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xor/and/or (For example SSE2).



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139623 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem
2011-09-13 19:17:42 +00:00
parent 48ae99fac4
commit aec5861bb6
4 changed files with 84 additions and 3 deletions
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45
lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp
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@ -61,6 +61,9 @@ class VectorLegalizer {
// Implements expansion for UINT_TO_FLOAT; falls back to UnrollVectorOp if
// SINT_TO_FLOAT and SHR on vectors isn't legal.
SDValue ExpandUINT_TO_FLOAT(SDValue Op);
// Implement vselect in terms of XOR, AND,OR when blend is not supported
// by the target.
SDValue ExpandVSELECT(SDValue Op);
SDValue ExpandFNEG(SDValue Op);
// Implements vector promotion; this is essentially just bitcasting the
// operands to a different type and bitcasting the result back to the
@ -157,6 +160,7 @@ SDValue VectorLegalizer::LegalizeOp(SDValue Op) {
case ISD::CTLZ:
case ISD::CTPOP:
case ISD::SELECT:
case ISD::VSELECT:
case ISD::SELECT_CC:
case ISD::SETCC:
case ISD::ZERO_EXTEND:
@ -210,7 +214,9 @@ SDValue VectorLegalizer::LegalizeOp(SDValue Op) {
// FALL THROUGH
}
case TargetLowering::Expand:
if (Node->getOpcode() == ISD::UINT_TO_FP)
if (Node->getOpcode() == ISD::VSELECT)
Result = ExpandVSELECT(Op);
else if (Node->getOpcode() == ISD::UINT_TO_FP)
Result = ExpandUINT_TO_FLOAT(Op);
else if (Node->getOpcode() == ISD::FNEG)
Result = ExpandFNEG(Op);
@ -256,9 +262,42 @@ SDValue VectorLegalizer::PromoteVectorOp(SDValue Op) {
return DAG.getNode(ISD::BITCAST, dl, VT, Op);
}
SDValue VectorLegalizer::ExpandVSELECT(SDValue Op) {
// Implement VSELECT in terms of XOR, AND, OR
// on platforms which do not support blend natively.
EVT VT = Op.getOperand(0).getValueType();
EVT OVT = Op.getOperand(0).getValueType();
DebugLoc DL = Op.getDebugLoc();
SDValue Mask = Op.getOperand(0);
SDValue Op1 = Op.getOperand(1);
SDValue Op2 = Op.getOperand(2);
// If we can't even use the basic vector operations of
// AND,OR,XOR, we will have to scalarize the op.
if (!TLI.isOperationLegalOrCustom(ISD::AND, VT) ||
!TLI.isOperationLegalOrCustom(ISD::XOR, VT) ||
!TLI.isOperationLegalOrCustom(ISD::OR, VT)) {
return DAG.UnrollVectorOp(Op.getNode());
}
assert(VT.getSizeInBits() == OVT.getSizeInBits() && "Invalid mask size");
// Bitcast the operands to be the same type as the mask.
// This is needed when we select between FP types because
// the mask is a vector of integers.
Op1 = DAG.getNode(ISD::BITCAST, DL, VT, Op1);
Op2 = DAG.getNode(ISD::BITCAST, DL, VT, Op2);
SDValue AllOnes = DAG.getConstant(
APInt::getAllOnesValue(VT.getScalarType().getSizeInBits()), VT);
SDValue NotMask = DAG.getNode(ISD::XOR, DL, VT, Mask, AllOnes);
Op1 = DAG.getNode(ISD::AND, DL, VT, Op1, Mask);
Op2 = DAG.getNode(ISD::AND, DL, VT, Op2, NotMask);
return DAG.getNode(ISD::OR, DL, VT, Op1, Op2);
}
SDValue VectorLegalizer::ExpandUINT_TO_FLOAT(SDValue Op) {
EVT VT = Op.getOperand(0).getValueType();
DebugLoc DL = Op.getDebugLoc();