[llvm] r206473 - [AArch64] Implement the getCSRFirstUseCost API, mirroring that in ARM64.

[Chad Rosier]

Author: mcrosier
Date: Thu Apr 17 11:19:54 2014
New Revision: 206473

URL: http://llvm.org/viewvc/llvm-project?rev=206473&view=rev
Log:
[AArch64] Implement the getCSRFirstUseCost API, mirroring that in ARM64.

Modified:
    llvm/trunk/lib/Target/AArch64/AArch64RegisterInfo.h

Modified: llvm/trunk/lib/Target/AArch64/AArch64RegisterInfo.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/AArch64/AArch64RegisterInfo.h?rev=206473&r1=206472&r2=206473&view=diff
==============================================================================
--- llvm/trunk/lib/Target/AArch64/AArch64RegisterInfo.h (original)
+++ llvm/trunk/lib/Target/AArch64/AArch64RegisterInfo.h Thu Apr 17 11:19:54 2014
@@ -30,6 +30,13 @@ struct AArch64RegisterInfo : public AArc
   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;