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Rename ConvertToSetZeroFlag to something more general.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113670 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2010-09-11 00:13:50 +00:00
parent 3665661a57
commit a65568676d
4 changed files with 11 additions and 10 deletions
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9
include/llvm/Target/TargetInstrInfo.h
View File

@ -585,10 +585,11 @@ public:
return false;
}
/// ConvertToSetZeroFlag - Convert the instruction supplying the argument to
/// the comparison into one that sets the zero bit in the flags
/// register. Update the iterator *only* if a transformation took place.
virtual bool ConvertToSetZeroFlag(MachineInstr * /*CmpInstr*/,
/// OptimizeCompareInstr - See if the comparison instruction can be converted
/// into something more efficient. E.g., on ARM most instructions can set the
/// flags register, obviating the need for a separate CMP. Update the iterator
/// *only* if a transformation took place.
virtual bool OptimizeCompareInstr(MachineInstr * /*CmpInstr*/,
unsigned /*SrcReg*/, int /*CmpValue*/,
MachineBasicBlock::iterator &) const {
return false;

4
lib/CodeGen/PeepholeOptimizer.cpp
View File

@ -243,8 +243,8 @@ bool PeepholeOptimizer::OptimizeCmpInstr(MachineInstr *MI,
TargetRegisterInfo::isPhysicalRegister(SrcReg))
return false;
// Attempt to convert the defining instruction to set the "zero" flag.
if (TII->ConvertToSetZeroFlag(MI, SrcReg, CmpValue, NextIter)) {
// Attempt to optimize the comparison instruction.
if (TII->OptimizeCompareInstr(MI, SrcReg, CmpValue, NextIter)) {
++NumEliminated;
return true;
}

4
lib/Target/ARM/ARMBaseInstrInfo.cpp
View File

@ -1377,11 +1377,11 @@ AnalyzeCompare(const MachineInstr *MI, unsigned &SrcReg, int &CmpValue) const {
return false;
}
/// ConvertToSetZeroFlag - Convert the instruction supplying the argument to the
/// OptimizeCompareInstr - Convert the instruction supplying the argument to the
/// comparison into one that sets the zero bit in the flags register. Update the
/// iterator *only* if a transformation took place.
bool ARMBaseInstrInfo::
ConvertToSetZeroFlag(MachineInstr *CmpInstr, unsigned SrcReg, int CmpValue,
OptimizeCompareInstr(MachineInstr *CmpInstr, unsigned SrcReg, int CmpValue,
MachineBasicBlock::iterator &MII) const {
if (CmpValue != 0)
return false;

4
lib/Target/ARM/ARMBaseInstrInfo.h
View File

@ -344,9 +344,9 @@ public:
virtual bool AnalyzeCompare(const MachineInstr *MI, unsigned &SrcReg,
int &CmpValue) const;
/// ConvertToSetZeroFlag - Convert the instruction to set the zero flag so
/// OptimizeCompareInstr - Convert the instruction to set the zero flag so
/// that we can remove a "comparison with zero".
virtual bool ConvertToSetZeroFlag(MachineInstr *CmpInstr, unsigned SrcReg,
virtual bool OptimizeCompareInstr(MachineInstr *CmpInstr, unsigned SrcReg,
int CmpValue,
MachineBasicBlock::iterator &MII) const;