[PATCH] D154805: [DAGCombiner] Fold IEEE `fmul`/`fdiv` by Pow2 to `add`/`sub` of exp

[Noah Goldstein via Phabricator via llvm-commits]

goldstein.w.n added a comment.

@arsenm I added some AMDGPU tests + some tests of ldexp so its easier to compare the results of this patch.
I would also be happy to add patch so this code can also generate `ldexp` for the `fmul` case if the target prefers it if that helps address your concerns.


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D154805/new/

https://reviews.llvm.org/D154805