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[RISC-V] Implement RISCVInstrInfo::isCopyInstrImpl()

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This does not result in changes for any of the current tests, but it might
improve debug information in some cases.

Reviewed By: luismarques

Differential Revision: https://reviews.llvm.org/D86522
This commit is contained in:
Alex Richardson 2020-09-21 08:59:22 +01:00
parent 562da2bbfa
commit 01addf8046
2 changed files with 26 additions and 1 deletions
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24
lib/Target/RISCV/RISCVInstrInfo.cpp
View File

@ -517,7 +517,7 @@ bool RISCVInstrInfo::isAsCheapAsAMove(const MachineInstr &MI) const {
break;
case RISCV::FSGNJ_D:
case RISCV::FSGNJ_S:
// The canonical floatig-point move is fsgnj rd, rs, rs.
// The canonical floating-point move is fsgnj rd, rs, rs.
return MI.getOperand(1).isReg() && MI.getOperand(2).isReg() &&
MI.getOperand(1).getReg() == MI.getOperand(2).getReg();
case RISCV::ADDI:
@ -530,6 +530,28 @@ bool RISCVInstrInfo::isAsCheapAsAMove(const MachineInstr &MI) const {
return MI.isAsCheapAsAMove();
}
Optional<DestSourcePair>
RISCVInstrInfo::isCopyInstrImpl(const MachineInstr &MI) const {
if (MI.isMoveReg())
return DestSourcePair{MI.getOperand(0), MI.getOperand(1)};
switch (MI.getOpcode()) {
default:
break;
case RISCV::ADDI:
if (MI.getOperand(2).isImm() && MI.getOperand(2).getImm() == 0)
return DestSourcePair{MI.getOperand(0), MI.getOperand(1)};
break;
case RISCV::FSGNJ_D:
case RISCV::FSGNJ_S:
// The canonical floating-point move is fsgnj rd, rs, rs.
if (MI.getOperand(1).isReg() && MI.getOperand(2).isReg() &&
MI.getOperand(1).getReg() == MI.getOperand(2).getReg())
return DestSourcePair{MI.getOperand(0), MI.getOperand(1)};
break;
}
return None;
}
bool RISCVInstrInfo::verifyInstruction(const MachineInstr &MI,
StringRef &ErrInfo) const {
const MCInstrInfo *MCII = STI.getInstrInfo();

3
lib/Target/RISCV/RISCVInstrInfo.h
View File

@ -83,6 +83,9 @@ public:
bool isAsCheapAsAMove(const MachineInstr &MI) const override;
Optional<DestSourcePair>
isCopyInstrImpl(const MachineInstr &MI) const override;
bool verifyInstruction(const MachineInstr &MI,
StringRef &ErrInfo) const override;