[PATCH] D36795: [SystemZ] Increase number of LOCRs emitted by passing regalloc hints

[Jonas Paulsson via Phabricator via llvm-commits]

jonpa updated this revision to Diff 112161.
jonpa added a comment.

updateRegAllocHint() updated per off-line discussion, which indeed gave better results than before:

New runs after improving updateRegAllocHint() to do a better job regarding physregs. (Basically it was unnecessary to check if the old reg was a physreg; all we need to know is if the NewReg is a low/high regclass...)

  BUILD                                  Number of LOCRs_lo	Number of LOCRs_hi	Number of RISBs         Number of spilled live ranges
  LOCRCONSTRAIN + UPDATEHINT	       6532			 3			76			48970
  LOCRHINTS + LOCRCONSTRAIN + UPDATEHINT 6576			26			 9			48972


https://reviews.llvm.org/D36795

Files:
  include/llvm/Target/TargetRegisterInfo.h
  lib/CodeGen/AllocationOrder.cpp
  lib/CodeGen/AllocationOrder.h
  lib/CodeGen/TargetRegisterInfo.cpp
  lib/Target/ARM/ARMBaseRegisterInfo.cpp
  lib/Target/ARM/ARMBaseRegisterInfo.h
  lib/Target/SystemZ/SystemZISelLowering.cpp
  lib/Target/SystemZ/SystemZInstrInfo.cpp
  lib/Target/SystemZ/SystemZRegisterInfo.cpp
  lib/Target/SystemZ/SystemZRegisterInfo.h

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