[llvm] 4e6adb3 - [RISCV] Transform fixable instruction in place in RISCVSExtWRemoval. NFC
Craig Topper via llvm-commits
llvm-commits at lists.llvm.org
Mon Nov 21 19:27:02 PST 2022
Author: Craig Topper
Date: 2022-11-21T19:22:53-08:00
New Revision: 4e6adb394ebcdb2350fac6b47f7b789750e1f300
URL: https://github.com/llvm/llvm-project/commit/4e6adb394ebcdb2350fac6b47f7b789750e1f300
DIFF: https://github.com/llvm/llvm-project/commit/4e6adb394ebcdb2350fac6b47f7b789750e1f300.diff
LOG: [RISCV] Transform fixable instruction in place in RISCVSExtWRemoval. NFC
Instead of creating a new instruction and copying operands, we can
use setDesc to convert in place.
Reviewed By: reames
Differential Revision: https://reviews.llvm.org/D137970
Added:
Modified:
llvm/lib/Target/RISCV/RISCVSExtWRemoval.cpp
Removed:
################################################################################
diff --git a/llvm/lib/Target/RISCV/RISCVSExtWRemoval.cpp b/llvm/lib/Target/RISCV/RISCVSExtWRemoval.cpp
index c040e01ad5cf..530918585bf9 100644
--- a/llvm/lib/Target/RISCV/RISCVSExtWRemoval.cpp
+++ b/llvm/lib/Target/RISCV/RISCVSExtWRemoval.cpp
@@ -492,6 +492,7 @@ bool RISCVSExtWRemoval::runOnMachineFunction(MachineFunction &MF) {
MachineRegisterInfo &MRI = MF.getRegInfo();
const RISCVSubtarget &ST = MF.getSubtarget<RISCVSubtarget>();
+ const RISCVInstrInfo &TII = *ST.getInstrInfo();
if (!ST.is64Bit())
return false;
@@ -531,22 +532,14 @@ bool RISCVSExtWRemoval::runOnMachineFunction(MachineFunction &MF) {
Register DstReg = MI->getOperand(0).getReg();
if (!MRI.constrainRegClass(SrcReg, MRI.getRegClass(DstReg)))
continue;
- // Replace Fixable instructions with their W versions.
+ // Convert Fixable instructions to their W versions.
for (MachineInstr *Fixable : FixableDef) {
- MachineBasicBlock &MBB = *Fixable->getParent();
- const DebugLoc &DL = Fixable->getDebugLoc();
- unsigned Code = getWOp(Fixable->getOpcode());
- MachineInstrBuilder Replacement =
- BuildMI(MBB, Fixable, DL, ST.getInstrInfo()->get(Code));
- for (auto Op : Fixable->operands())
- Replacement.add(Op);
- for (auto *Op : Fixable->memoperands())
- Replacement.addMemOperand(Op);
-
LLVM_DEBUG(dbgs() << "Replacing " << *Fixable);
- LLVM_DEBUG(dbgs() << " with " << *Replacement);
-
- Fixable->eraseFromParent();
+ Fixable->setDesc(TII.get(getWOp(Fixable->getOpcode())));
+ Fixable->clearFlag(MachineInstr::MIFlag::NoSWrap);
+ Fixable->clearFlag(MachineInstr::MIFlag::NoUWrap);
+ Fixable->clearFlag(MachineInstr::MIFlag::IsExact);
+ LLVM_DEBUG(dbgs() << " with " << *Fixable);
++NumTransformedToWInstrs;
}
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