efriedma added a comment.

> The fcmp opcode has no defined behavior with NaN operands in the comparisions 
> handled in this patch.

Could you describe the problem here in a bit more detail?  As far as I know, 
the LLVM IR fcmp should return the same result as the x86 CMPPD, even without 
fast-math.


Repository:
  rC Clang

https://reviews.llvm.org/D45616



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