[PATCH] D72824: [X86] Add combination for fma and fneg on X86 under strict FP.

[Pengfei Wang via Phabricator via cfe-commits]

pengfei added a comment.

In D72824#1835568 <https://reviews.llvm.org/D72824#1835568>, @RKSimon wrote:

> Add to isNegatibleForFree/getNegatedExpression as well?


We don't need to add them to isNegatibleForFree/getNegatedExpression. We won't negate any FMA results by negative FMA instructions under strict FP, because fneg(FMA) has different result from FNMA under some rounding mode.


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D72824/new/

https://reviews.llvm.org/D72824