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updating isNegatibleForFree and GetNegatedExpression with fmf for fadd

Authored by mcberg2017 on Jun 14 2018, 11:48 AM.

Description

updating isNegatibleForFree and GetNegatedExpression with fmf for fadd

Summary: A FMF constraint is added to FADD with unsafe still available as the fallback

Reviewers: spatel, wristow, arsenm, hfinkel

Reviewed By: spatel

Subscribers: wdng

Differential Revision: https://reviews.llvm.org/D48180

llvm-svn: 334753