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Optimized FMA intrinsic + FNEG , like -(a*b+c)

Authored by delena on Sep 1 2016, 6:58 AM.

Description

Optimized FMA intrinsic + FNEG , like -(a*b+c)

and FNEG + FMA, like
a*b-c or (-a)*b+c.

The bug description is here : https://llvm.org/bugs/show_bug.cgi?id=28892

Differential revision: https://reviews.llvm.org/D23313

llvm-svn: 280368

Details