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MachineCSE: Add a target query for the LookAheadLimit heurisitic

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This is used to determine whether or not to CSE physical register
defs.

Differential Revision: http://reviews.llvm.org/D9472

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236923 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tom Stellard
2015-05-09 00:56:07 +00:00
parent f5b930b2e2
commit 7d66bd3e7f
3 changed files with 13 additions and 2 deletions
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2
lib/Target/R600/SIInstrInfo.h
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@@ -142,6 +142,8 @@ public:
bool FoldImmediate(MachineInstr *UseMI, MachineInstr *DefMI,
unsigned Reg, MachineRegisterInfo *MRI) const final;
unsigned getMachineCSELookAheadLimit() const override { return 500; }
bool isSALU(uint16_t Opcode) const {
return get(Opcode).TSFlags & SIInstrFlags::SALU;
}