[PATCH] D25297: [DAG] use SDNode flags 'nsz' to enable fadd/fsub with zero folds

Sanjay Patel via llvm-commits llvm-commits at lists.llvm.org
Thu Oct 20 13:52:26 PDT 2016

spatel added a comment.

In https://reviews.llvm.org/D25297#575826, @echristo wrote:

> This seems reasonable to me. I'd like to see something that adds the attribute to the instructions at some point, but as an intermediate step this is fine.

Do you mean propagate the FMF flags on the returned SDNode? Eg:

  return DAG.getNode(ISD::FNEG, DL, VT, N1, Flags);

Oops...I forgot to do that in *this* patch.


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