[PATCH] D126008: [GISel] Add new combines for G_FMUL with constant operands

[Michael Kitzan via Phabricator via llvm-commits]

mkitzan created this revision.
mkitzan added reviewers: arsenm, paquette, aemerson, foad, aditya_nandakumar, dsanders.
mkitzan added a project: LLVM.
Herald added subscribers: hiraditya, kristof.beyls.
Herald added a project: All.
mkitzan requested review of this revision.
Herald added subscribers: llvm-commits, wdng.

Patch adds new GICombineRules for G_FMUL:

- G_FMUL(G_FMUL(x, c0), c1) -> G_FMUL(x, c0 * c1) (unsafe fp math only)
- G_FMUL(G_FADD(x, x), c) -> G_FMUL(x, c * 2.0) (unsafe fp math only)

Patch additionally adds new combine tests for AArch64 target for these new rules.
(Split off from https://reviews.llvm.org/D87870)


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D126008

Files:
  llvm/include/llvm/CodeGen/GlobalISel/CombinerHelper.h
  llvm/include/llvm/Target/GlobalISel/Combine.td
  llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
  llvm/test/CodeGen/AArch64/GlobalISel/combine-fmul.mir

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