[PATCH] D21663: [MBP] Enhance cost based branch prob threshold computation to handle general control flows

[David Li via llvm-commits]

davidxl created this revision.
davidxl added reviewers: danielcdh, congh.
davidxl added a subscriber: llvm-commits.

See comments in the code for details.

Also added more extensive testing in various scenarios to make sure the optimal layout (with minimal branch cost or maximal fall through) is picked.

http://reviews.llvm.org/D21663

Files:
  lib/CodeGen/MachineBlockPlacement.cpp
  test/CodeGen/X86/code_placement_pgo_cost.ll

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