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Fix funky indentation and add comments.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97670 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2010-03-03 21:54:14 +00:00
parent a054ae02fd
commit 34cdf6edf5
1 changed files with 24 additions and 17 deletions

41
lib/CodeGen/MachineInstr.cpp

@ -704,24 +704,31 @@ void MachineInstr::addMemOperand(MachineFunction &MF,
bool MachineInstr::isIdenticalTo(const MachineInstr *Other,
MICheckType Check) const {
if (Other->getOpcode() != getOpcode() ||
Other->getNumOperands() != getNumOperands())
// If opcodes or number of operands are not the same then the two
// instructions are obviously not identical.
if (Other->getOpcode() != getOpcode() ||
Other->getNumOperands() != getNumOperands())
return false;
// Check operands to make sure they match.
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
const MachineOperand &MO = getOperand(i);
const MachineOperand &OMO = Other->getOperand(i);
// Clients may or may not want to ignore defs when testing for equality.
// For example, machine CSE pass only cares about finding common
// subexpressions, so it's safe to ignore virtual register defs.
if (Check != CheckDefs && MO.isReg() && MO.isDef()) {
if (Check == IgnoreDefs)
continue;
// Check == IgnoreVRegDefs
if (TargetRegisterInfo::isPhysicalRegister(MO.getReg()) ||
TargetRegisterInfo::isPhysicalRegister(OMO.getReg()))
if (MO.getReg() != OMO.getReg())
return false;
} else if (!MO.isIdenticalTo(OMO))
return false;
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
const MachineOperand &MO = getOperand(i);
const MachineOperand &OMO = Other->getOperand(i);
if (Check != CheckDefs && MO.isReg() && MO.isDef()) {
if (Check == IgnoreDefs)
continue;
// Check == IgnoreVRegDefs
if (TargetRegisterInfo::isPhysicalRegister(MO.getReg()) ||
TargetRegisterInfo::isPhysicalRegister(OMO.getReg()))
if (MO.getReg() != OMO.getReg())
return false;
} else if (!MO.isIdenticalTo(OMO))
return false;
}
return true;
}
return true;
}
/// removeFromParent - This method unlinks 'this' from the containing basic