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[RISCV] Refactor translateSetCCForBranch to prepare for D130508. NFC. 

D130508 handles more constants than just 1 or -1. We need to extract
the constant instead of relying isOneConstant or isAllOnesConstant.
This commit is contained in:
Craig Topper 2022-07-25 15:42:42 -07:00
parent 1e636f2676
commit 45944e7cf4
1 changed files with 22 additions and 12 deletions
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34
llvm/lib/Target/RISCV/RISCVISelLowering.cpp
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@ -1406,18 +1406,28 @@ static void translateSetCCForBranch(const SDLoc &DL, SDValue &LHS, SDValue &RHS,
}
}
// Convert X > -1 to X >= 0.
if (CC == ISD::SETGT && isAllOnesConstant(RHS)) {
RHS = DAG.getConstant(0, DL, RHS.getValueType());
CC = ISD::SETGE;
return;
}
// Convert X < 1 to 0 >= X.
if (CC == ISD::SETLT && isOneConstant(RHS)) {
RHS = LHS;
LHS = DAG.getConstant(0, DL, RHS.getValueType());
CC = ISD::SETGE;
return;
if (auto *RHSC = dyn_cast<ConstantSDNode>(RHS)) {
int64_t C = RHSC->getSExtValue();
switch (CC) {
default: break;
case ISD::SETGT:
// Convert X > -1 to X >= 0.
if (C == -1) {
RHS = DAG.getConstant(0, DL, RHS.getValueType());
CC = ISD::SETGE;
return;
}
break;
case ISD::SETLT:
// Convert X < 1 to 0 <= X.
if (C == 1) {
RHS = LHS;
LHS = DAG.getConstant(0, DL, RHS.getValueType());
CC = ISD::SETGE;
return;
}
break;
}
}
switch (CC) {