[PATCH] [AtomicExpand] Set branch weights when new basic blocks are created

[Akira Hatanaka]

Defined a new function which returns weights for both destination BBs.

The rationale for optimizing for the no contention case is that, if there are a lot of contentions, the program won't run fast anyway, however, I don't have data to support my decision.

Do you have any suggestions for benchmark programs that I can run to evaluate the changes I made in my patch?


http://reviews.llvm.org/D7804

Files:
  include/llvm/Analysis/BranchProbabilityInfo.h
  lib/Analysis/BranchProbabilityInfo.cpp
  lib/CodeGen/AtomicExpandPass.cpp
  test/CodeGen/AArch64/arm64-atomic.ll
  test/CodeGen/ARM/atomic-64bit.ll
  test/CodeGen/ARM/cmpxchg-idioms.ll
  test/CodeGen/X86/atomic128.ll
  test/Transforms/AtomicExpand/ARM/atomic-expansion-v7.ll
  test/Transforms/AtomicExpand/ARM/atomic-expansion-v8.ll
  test/Transforms/AtomicExpand/ARM/cmpxchg-weak.ll
  test/Transforms/AtomicExpand/X86/atomic32-weight.ll
  test/Transforms/AtomicExpand/X86/lit.local.cfg

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