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Modify the comparison optimizations in the peephole optimizer to update the

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iterator when an optimization took place. This allows us to do more insane
things with the code than just remove an instruction or two.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113640 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling
2010-09-10 21:55:43 +00:00
parent 51f5b67395
commit 220e240bdf
4 changed files with 22 additions and 12 deletions
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8
include/llvm/Target/TargetInstrInfo.h
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@@ -586,9 +586,11 @@ public:
}
/// ConvertToSetZeroFlag - Convert the instruction to set the zero flag so
/// that we can remove a "comparison with zero".
virtual bool ConvertToSetZeroFlag(MachineInstr *Instr,
MachineInstr *CmpInstr) const {
/// that we can remove a "comparison with zero". Update the iterator *only*
/// if a transformation took place.
virtual bool ConvertToSetZeroFlag(MachineInstr * /*Instr*/,
MachineInstr * /*CmpInstr*/,
MachineBasicBlock::iterator &) const {
return false;
}