[PATCH] D14909: [X86][FMA] Optimize FNEG(FMUL) Patterns

[Steve Canon via llvm-commits]

scanon added a comment.

In http://reviews.llvm.org/D14909#298784, @spatel wrote:

>




> Would it still be better to use FNMSUB now even with the nsz check, so we're minimizing codegen differences after we have rounding-mode support?


Yes, also because it's more correct (even though the wrong answer is licensed by NSZ, if we can produce the right answer at no cost, we might as well do so).


Repository:
  rL LLVM

http://reviews.llvm.org/D14909