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PTX: support for select_cc and fixes for setcc

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- expansion of SELECT_CC into SETCC
- force SETCC result type to i1
- custom selection for handling i1 using SETCC

Patch by Dan Bailey

llvm-svn: 130358
This commit is contained in:
Justin Holewinski 2011-04-28 00:19:56 +00:00
parent a042c76db5
commit a1728a7d40
2 changed files with 41 additions and 1 deletions
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36
lib/Target/PTX/PTXISelLowering.cpp
View File

@ -58,14 +58,28 @@ PTXTargetLowering::PTXTargetLowering(TargetMachine &TM)
// Expand BR_CC into BRCOND
setOperationAction(ISD::BR_CC, MVT::Other, Expand);
// Expand SELECT_CC into SETCC
setOperationAction(ISD::SELECT_CC, MVT::Other, Expand);
setOperationAction(ISD::SELECT_CC, MVT::f32, Expand);
setOperationAction(ISD::SELECT_CC, MVT::f64, Expand);
// need to lower SETCC of Preds into bitwise logic
setOperationAction(ISD::SETCC, MVT::i1, Custom);
// Compute derived properties from the register classes
computeRegisterProperties();
}
MVT::SimpleValueType PTXTargetLowering::getSetCCResultType(EVT VT) const {
return MVT::i1;
}
SDValue PTXTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) const {
switch (Op.getOpcode()) {
default:
llvm_unreachable("Unimplemented operand");
case ISD::SETCC:
return LowerSETCC(Op, DAG);
case ISD::GlobalAddress:
return LowerGlobalAddress(Op, DAG);
}
@ -90,6 +104,28 @@ const char *PTXTargetLowering::getTargetNodeName(unsigned Opcode) const {
// Custom Lower Operation
//===----------------------------------------------------------------------===//
SDValue PTXTargetLowering::LowerSETCC(SDValue Op, SelectionDAG &DAG) const {
assert(Op.getValueType() == MVT::i1 && "SetCC type must be 1-bit integer");
SDValue Op0 = Op.getOperand(0);
SDValue Op1 = Op.getOperand(1);
SDValue Op2 = Op.getOperand(2);
DebugLoc dl = Op.getDebugLoc();
ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(2))->get();
// Look for X == 0, X == 1, X != 0, or X != 1
// We can simplify these to bitwise logic
if (Op1.getOpcode() == ISD::Constant &&
(cast<ConstantSDNode>(Op1)->getZExtValue() == 1 ||
cast<ConstantSDNode>(Op1)->isNullValue()) &&
(CC == ISD::SETEQ || CC == ISD::SETNE)) {
return DAG.getNode(ISD::AND, dl, MVT::i1, Op0, Op1);
}
return DAG.getNode(ISD::SETCC, dl, MVT::i1, Op0, Op1, Op2);
}
SDValue PTXTargetLowering::
LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const {
EVT PtrVT = getPointerTy();

6
lib/Target/PTX/PTXISelLowering.h
View File

@ -42,6 +42,8 @@ class PTXTargetLowering : public TargetLowering {
virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const;
virtual SDValue LowerSETCC(SDValue Op, SelectionDAG &DAG) const;
virtual SDValue
LowerFormalArguments(SDValue Chain,
CallingConv::ID CallConv,
@ -59,7 +61,9 @@ class PTXTargetLowering : public TargetLowering {
const SmallVectorImpl<SDValue> &OutVals,
DebugLoc dl,
SelectionDAG &DAG) const;
virtual MVT::SimpleValueType getSetCCResultType(EVT VT) const;
private:
SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
}; // class PTXTargetLowering