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[FPEnv][SelectionDAG] Refactor strict FP node construction

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Small refactoring in visitConstrainedFPIntrinsic that should make
it easier to create DAG nodes requiring extra arguments.  That is
the case currently only for STRICT_FP_ROUND, but may be the case
for additional nodes (in particular compares) in the future.

Extracted from the patch for D69281.

NFC.
This commit is contained in:
Ulrich Weigand 2019-11-04 17:42:32 +01:00
parent fcb5e0f825
commit 2676807e81
1 changed files with 23 additions and 23 deletions
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46
lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
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@ -6894,6 +6894,26 @@ void SelectionDAGBuilder::visitIntrinsicCall(const CallInst &I,
void SelectionDAGBuilder::visitConstrainedFPIntrinsic(
const ConstrainedFPIntrinsic &FPI) {
SDLoc sdl = getCurSDLoc();
const TargetLowering &TLI = DAG.getTargetLoweringInfo();
SmallVector<EVT, 4> ValueVTs;
ComputeValueVTs(TLI, DAG.getDataLayout(), FPI.getType(), ValueVTs);
ValueVTs.push_back(MVT::Other); // Out chain
SDValue Chain = getRoot();
SmallVector<SDValue, 4> Opers;
Opers.push_back(Chain);
if (FPI.isUnaryOp()) {
Opers.push_back(getValue(FPI.getArgOperand(0)));
} else if (FPI.isTernaryOp()) {
Opers.push_back(getValue(FPI.getArgOperand(0)));
Opers.push_back(getValue(FPI.getArgOperand(1)));
Opers.push_back(getValue(FPI.getArgOperand(2)));
} else {
Opers.push_back(getValue(FPI.getArgOperand(0)));
Opers.push_back(getValue(FPI.getArgOperand(1)));
}
unsigned Opcode;
switch (FPI.getIntrinsicID()) {
default: llvm_unreachable("Impossible intrinsic"); // Can't reach here.
@ -6923,6 +6943,8 @@ void SelectionDAGBuilder::visitConstrainedFPIntrinsic(
break;
case Intrinsic::experimental_constrained_fptrunc:
Opcode = ISD::STRICT_FP_ROUND;
Opers.push_back(DAG.getTargetConstant(0, sdl,
TLI.getPointerTy(DAG.getDataLayout())));
break;
case Intrinsic::experimental_constrained_fpext:
Opcode = ISD::STRICT_FP_EXTEND;
@ -6994,31 +7016,9 @@ void SelectionDAGBuilder::visitConstrainedFPIntrinsic(
Opcode = ISD::STRICT_FTRUNC;
break;
}
const TargetLowering &TLI = DAG.getTargetLoweringInfo();
SDValue Chain = getRoot();
SmallVector<EVT, 4> ValueVTs;
ComputeValueVTs(TLI, DAG.getDataLayout(), FPI.getType(), ValueVTs);
ValueVTs.push_back(MVT::Other); // Out chain
SDVTList VTs = DAG.getVTList(ValueVTs);
SDValue Result;
if (Opcode == ISD::STRICT_FP_ROUND)
Result = DAG.getNode(Opcode, sdl, VTs,
{ Chain, getValue(FPI.getArgOperand(0)),
DAG.getTargetConstant(0, sdl,
TLI.getPointerTy(DAG.getDataLayout())) });
else if (FPI.isUnaryOp())
Result = DAG.getNode(Opcode, sdl, VTs,
{ Chain, getValue(FPI.getArgOperand(0)) });
else if (FPI.isTernaryOp())
Result = DAG.getNode(Opcode, sdl, VTs,
{ Chain, getValue(FPI.getArgOperand(0)),
getValue(FPI.getArgOperand(1)),
getValue(FPI.getArgOperand(2)) });
else
Result = DAG.getNode(Opcode, sdl, VTs,
{ Chain, getValue(FPI.getArgOperand(0)),
getValue(FPI.getArgOperand(1)) });
SDValue Result = DAG.getNode(Opcode, sdl, VTs, Opers);
if (FPI.getExceptionBehavior() !=
ConstrainedFPIntrinsic::ExceptionBehavior::ebIgnore) {