[llvm-commits] [Patch] Optimize away a cmp instruction on X86

[Manman Ren]

Hi All,

This patch is to generalize an earlier patch (r155919), it will handle the following cases where we can remove a CMP:
  (a >|>=|<|<= b) ? (a-b) : any
  (a >|>=|<|<= b) ? any : (a-b)
  (b >|>=|<|<= a) ? (a-b) : any
  (b >|>=|<|<= a) ? any : (a-b)

A corresponding optimization on ARM was implemented in peephole pass.

Thanks,
Manman

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