[PATCH] [CodeGenPrepare] Teach when it is profitable to speculate calls to @llvm.cttz/ctlz.

[Andrea Di Biagio]

Uploaded a new version of the patch. Previous patch had a wrong test in it. Sorry for the confusion.


http://reviews.llvm.org/D6728

Files:
  include/llvm/Target/TargetLowering.h
  lib/CodeGen/CodeGenPrepare.cpp
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86ISelLowering.h
  test/CodeGen/X86/cttz-ctlz.ll

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