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Add isIdentityCopy to check for identity copy (or extract_subreg, etc.)

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85044 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2009-10-25 07:47:07 +00:00
parent f5a86f45e7
commit f5fe5e4e79
1 changed files with 19 additions and 9 deletions
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28
include/llvm/Target/TargetInstrInfo.h
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@ -145,20 +145,30 @@ public:
/// isIdentityCopy - Return true if the instruction is a copy (or
/// extract_subreg, insert_subreg, subreg_to_reg) where the source and
/// destination registers are the same.
bool isIdentityCopy(const MachineInstr &MI) const {
unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx;
bool isIdentityCopy(const MachineInstr &MI,
unsigned &SrcReg, unsigned &DstReg,
unsigned &SrcSubIdx, unsigned &DstSubIdx) const {
if (isMoveInstr(MI, SrcReg, DstReg, SrcSubIdx, DstSubIdx) &&
SrcReg == DstReg)
return true;
if (MI.getOpcode() == TargetInstrInfo::EXTRACT_SUBREG &&
MI.getOperand(0).getReg() == MI.getOperand(1).getReg())
return true;
if (MI.getOpcode() == TargetInstrInfo::EXTRACT_SUBREG) {
DstReg = MI.getOperand(0).getReg();
DstSubIdx = MI.getOperand(0).getSubReg();
SrcReg = MI.getOperand(1).getReg();
SrcSubIdx = MI.getOperand(1).getSubReg();
return DstReg == SrcReg;
}
if (MI.getOpcode() == TargetInstrInfo::INSERT_SUBREG ||
MI.getOpcode() == TargetInstrInfo::SUBREG_TO_REG) {
DstReg = MI.getOperand(0).getReg();
DstSubIdx = MI.getOperand(0).getSubReg();
SrcReg = MI.getOperand(2).getReg();
SrcSubIdx = MI.getOperand(2).getSubReg();
return DstReg == SrcReg;
}
if ((MI.getOpcode() == TargetInstrInfo::INSERT_SUBREG ||
MI.getOpcode() == TargetInstrInfo::SUBREG_TO_REG) &&
MI.getOperand(0).getReg() == MI.getOperand(2).getReg())
return true;
return false;
}