[PATCH] D54123: [X86] improve split-stack machine BB placement

[Than McIntosh via Phabricator via llvm-commits]

thanm created this revision.
Herald added a subscriber: llvm-commits.

The conditional branch created to support -fsplit-stack for X86 is
left unbiased/unhinted, resulting in less than idea block placement:
the __morestack call block is kept on the main hot path. Bias the
branch to insure that the stack allocation block is treated as a
"cold" block during machine basic block placement.


Repository:
  rL LLVM

https://reviews.llvm.org/D54123

Files:
  lib/Target/X86/X86FrameLowering.cpp
  test/CodeGen/X86/segmented-stacks-dynamic.ll
  test/CodeGen/X86/segmented-stacks.ll
  test/CodeGen/X86/x86-shrink-wrap-unwind.ll

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