Sanjay Patel a9ca709011 [InstCombine] limit nsz: -(X - Y) --> Y - X to hasOneUse() ...

As noted in the post-commit discussion for r329350, we shouldn't
generally assume that fsub is the same cost as fneg.

llvm-svn: 329429

2018-04-06 17:24:08 +00:00

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