OSchip
/
llvm-project
mirror of https://github.com/THU-DSP-LAB/llvm-project.git
13
0
Fork 2
Code Issues Packages Projects Releases Wiki Activity

[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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
llvm/lib/Target/RISCV/RISCVISelLowering.cpp
View File

@ -1406,19 +1406,29 @@ static void translateSetCCForBranch(const SDLoc &DL, SDValue &LHS, SDValue &RHS,
} }
} }
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. // Convert X > -1 to X >= 0.
if (CC == ISD::SETGT && isAllOnesConstant(RHS)) { if (C == -1) {
RHS = DAG.getConstant(0, DL, RHS.getValueType()); RHS = DAG.getConstant(0, DL, RHS.getValueType());
CC = ISD::SETGE; CC = ISD::SETGE;
return; return;
} }
// Convert X < 1 to 0 >= X. break;
if (CC == ISD::SETLT && isOneConstant(RHS)) { case ISD::SETLT:
// Convert X < 1 to 0 <= X.
if (C == 1) {
RHS = LHS; RHS = LHS;
LHS = DAG.getConstant(0, DL, RHS.getValueType()); LHS = DAG.getConstant(0, DL, RHS.getValueType());
CC = ISD::SETGE; CC = ISD::SETGE;
return; return;
} }
break;
}
}
switch (CC) { switch (CC) {
default: default: