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No need to recompute the SrcReg and CmpValue.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113666 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2010-09-10 23:46:12 +00:00
parent 92ad57f066
commit 3665661a57
4 changed files with 6 additions and 6 deletions
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1
include/llvm/Target/TargetInstrInfo.h
View File

@ -589,6 +589,7 @@ public:
/// 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*/,
unsigned /*SrcReg*/, int /*CmpValue*/,
MachineBasicBlock::iterator &) const {
return false;
}

2
lib/CodeGen/PeepholeOptimizer.cpp
View File

@ -244,7 +244,7 @@ bool PeepholeOptimizer::OptimizeCmpInstr(MachineInstr *MI,
return false;
// Attempt to convert the defining instruction to set the "zero" flag.
if (TII->ConvertToSetZeroFlag(MI, NextIter)) {
if (TII->ConvertToSetZeroFlag(MI, SrcReg, CmpValue, NextIter)) {
++NumEliminated;
return true;
}

6
lib/Target/ARM/ARMBaseInstrInfo.cpp
View File

@ -1381,11 +1381,9 @@ AnalyzeCompare(const MachineInstr *MI, unsigned &SrcReg, int &CmpValue) const {
/// 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,
ConvertToSetZeroFlag(MachineInstr *CmpInstr, unsigned SrcReg, int CmpValue,
MachineBasicBlock::iterator &MII) const {
unsigned SrcReg;
int CmpValue;
if (!AnalyzeCompare(CmpInstr, SrcReg, CmpValue) || CmpValue != 0)
if (CmpValue != 0)
return false;
MachineRegisterInfo &MRI = CmpInstr->getParent()->getParent()->getRegInfo();

3
lib/Target/ARM/ARMBaseInstrInfo.h
View File

@ -346,7 +346,8 @@ public:
/// ConvertToSetZeroFlag - Convert the instruction to set the zero flag so
/// that we can remove a "comparison with zero".
virtual bool ConvertToSetZeroFlag(MachineInstr *CmpInstr,
virtual bool ConvertToSetZeroFlag(MachineInstr *CmpInstr, unsigned SrcReg,
int CmpValue,
MachineBasicBlock::iterator &MII) const;
virtual unsigned getNumMicroOps(const MachineInstr *MI,