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[AArch64] Implement the getCSRFirstUseCost API, mirroring that in ARM64.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206473 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chad Rosier 2014-04-17 16:19:54 +00:00
parent 207be301e3
commit fa477d9837
1 changed files with 7 additions and 0 deletions
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7
lib/Target/AArch64/AArch64RegisterInfo.h
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@ -30,6 +30,13 @@ struct AArch64RegisterInfo : public AArch64GenRegisterInfo {
const MCPhysReg *getCalleeSavedRegs(const MachineFunction *MF = 0) const;
const uint32_t *getCallPreservedMask(CallingConv::ID) const;
unsigned getCSRFirstUseCost() const {
// The cost will be compared against BlockFrequency where entry has the
// value of 1 << 14. A value of 5 will choose to spill or split really
// cold path instead of using a callee-saved register.
return 5;
}
const uint32_t *getTLSDescCallPreservedMask() const;
BitVector getReservedRegs(const MachineFunction &MF) const;