[PATCH] D17729: [TargetInstrInfo] Add TargetInstrInfo interface isProfitableToBranch.

[Balaram Makam via llvm-commits]

bmakam created this revision.
bmakam added reviewers: mcrosier, apazos.
bmakam added a subscriber: llvm-commits.
Herald added subscribers: mcrosier, aemerson.

Add TargetInstrInfo::isProfitableToBranch and implement for AArch64. This
implements heuristics to determine if it is profitable to branch from a
dominating head block that is terminated by the conditional branch into the compare
block that contains the compare instruction and the conditional branch.
AArch64ConditionalCompares pass uses this heuristics to decide on merging the compare
block into the head block.

http://reviews.llvm.org/D17729

Files:
  include/llvm/Target/TargetInstrInfo.h
  lib/Target/AArch64/AArch64ConditionalCompares.cpp
  lib/Target/AArch64/AArch64InstrInfo.cpp
  lib/Target/AArch64/AArch64InstrInfo.h
  test/CodeGen/AArch64/aarch64-branch-heuristics.ll

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