[PATCH] D10717: Enhance loop rotation with existence of profile data in MachineBlockPlacement pass.

[Cong Hou]

congh updated this revision to Diff 30773.
congh added a comment.

Measure the loop rotation only in cost instead of cost+benefit.

Improve the inefficient code that computes branch probabilities.


http://reviews.llvm.org/D10717

Files:
  lib/CodeGen/MachineBlockPlacement.cpp
  test/CodeGen/X86/code_placement_loop_rotation.ll
  test/CodeGen/X86/code_placement_loop_rotation2.ll

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