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Add getUniqueVRegDef to MachineRegisterInfo.

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This comes in handy during peephole optimization.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159453 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Manman Ren
2012-06-29 19:16:05 +00:00
parent 2923bca2b5
commit 54d69668b2
2 changed files with 16 additions and 0 deletions
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5
include/llvm/CodeGen/MachineRegisterInfo.h
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@@ -237,6 +237,11 @@ public:
/// form, so there should only be one definition.
MachineInstr *getVRegDef(unsigned Reg) const;
/// getUniqueVRegDef - Return the unique machine instr that defines the
/// specified virtual register or null if none is found. If there are
/// multiple definitions or no definition, return null.
MachineInstr *getUniqueVRegDef(unsigned Reg) const;
/// clearKillFlags - Iterate over all the uses of the given register and
/// clear the kill flag from the MachineOperand. This function is used by
/// optimization passes which extend register lifetimes and need only