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Add first draft for conditions, conditional branches, etc

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70743 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov
2009-05-03 13:12:06 +00:00
parent 6e4f62790b
commit ed1a51af37
4 changed files with 202 additions and 2 deletions
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83
lib/Target/MSP430/MSP430ISelLowering.cpp
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@@ -70,6 +70,10 @@ MSP430TargetLowering::MSP430TargetLowering(MSP430TargetMachine &tm) :
setOperationAction(ISD::SRA, MVT::i16, Custom);
setOperationAction(ISD::RET, MVT::Other, Custom);
setOperationAction(ISD::GlobalAddress, MVT::i16, Custom);
setOperationAction(ISD::BR_CC, MVT::Other, Expand);
setOperationAction(ISD::BRCOND, MVT::Other, Custom);
setOperationAction(ISD::SETCC, MVT::i8 , Custom);
setOperationAction(ISD::SETCC, MVT::i16 , Custom);
}
SDValue MSP430TargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) {
@@ -79,6 +83,8 @@ SDValue MSP430TargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) {
case ISD::RET: return LowerRET(Op, DAG);
case ISD::CALL: return LowerCALL(Op, DAG);
case ISD::GlobalAddress: return LowerGlobalAddress(Op, DAG);
case ISD::SETCC: return LowerSETCC(Op, DAG);
case ISD::BRCOND: return LowerBRCOND(Op, DAG);
default:
assert(0 && "unimplemented operand");
return SDValue();
@@ -437,6 +443,80 @@ SDValue MSP430TargetLowering::LowerGlobalAddress(SDValue Op, SelectionDAG &DAG)
getPointerTy(), Result);
}
MVT MSP430TargetLowering::getSetCCResultType(MVT VT) const {
return MVT::i8;
}
SDValue MSP430TargetLowering::LowerSETCC(SDValue Op, SelectionDAG &DAG) {
assert(Op.getValueType() == MVT::i8 && "SetCC type must be 8-bit integer");
SDValue LHS = Op.getOperand(0);
SDValue RHS = Op.getOperand(1);
DebugLoc dl = Op.getDebugLoc();
ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(2))->get();
// FIXME: Handle bittests someday
assert(!LHS.getValueType().isFloatingPoint() && "We don't handle FP yet");
// FIXME: Handle jump negative someday
unsigned TargetCC = 0;
switch (CC) {
default: assert(0 && "Invalid integer condition!");
case ISD::SETEQ:
TargetCC = MSP430::COND_E; // aka COND_Z
break;
case ISD::SETNE:
TargetCC = MSP430::COND_NE; // aka COND_NZ
break;
case ISD::SETULE:
std::swap(LHS, RHS); // FALLTHROUGH
case ISD::SETUGE:
TargetCC = MSP430::COND_HS; // aka COND_C
break;
case ISD::SETUGT:
std::swap(LHS, RHS); // FALLTHROUGH
case ISD::SETULT:
TargetCC = MSP430::COND_LO; // aka COND_NC
break;
case ISD::SETLE:
std::swap(LHS, RHS); // FALLTHROUGH
case ISD::SETGE:
TargetCC = MSP430::COND_GE;
break;
case ISD::SETGT:
std::swap(LHS, RHS); // FALLTHROUGH
case ISD::SETLT:
TargetCC = MSP430::COND_L;
break;
}
SDValue Cond = DAG.getNode(MSP430ISD::CMP, dl, MVT::i16, LHS, RHS);
return DAG.getNode(MSP430ISD::SETCC, dl, MVT::i8,
DAG.getConstant(TargetCC, MVT::i8), Cond);
}
SDValue MSP430TargetLowering::LowerBRCOND(SDValue Op, SelectionDAG &DAG) {
SDValue Chain = Op.getOperand(0);
SDValue Cond = Op.getOperand(1);
SDValue Dest = Op.getOperand(2);
DebugLoc dl = Op.getDebugLoc();
SDValue CC;
// Lower condition if not lowered yet
if (Cond.getOpcode() == ISD::SETCC)
Cond = LowerSETCC(Cond, DAG);
// If condition flag is set by a MSP430ISD::CMP, then use it as the condition
// setting operand in place of the MSP430ISD::SETCC.
if (Cond.getOpcode() == MSP430ISD::SETCC) {
CC = Cond.getOperand(0);
Cond = Cond.getOperand(1);
} else
assert(0 && "Unimplemented condition!");
return DAG.getNode(MSP430ISD::BRCOND, dl, Op.getValueType(),
Chain, Dest, CC, Cond);
}
const char *MSP430TargetLowering::getTargetNodeName(unsigned Opcode) const {
switch (Opcode) {
default: return NULL;
@@ -444,5 +524,8 @@ const char *MSP430TargetLowering::getTargetNodeName(unsigned Opcode) const {
case MSP430ISD::RRA: return "MSP430ISD::RRA";
case MSP430ISD::CALL: return "MSP430ISD::CALL";
case MSP430ISD::Wrapper: return "MSP430ISD::Wrapper";
case MSP430ISD::BRCOND: return "MSP430ISD::BRCOND";
case MSP430ISD::CMP: return "MSP430ISD::CMP";
case MSP430ISD::SETCC: return "MSP430ISD::SETCC";
}
}