[PATCH] D125819: [GISel] Add new combines for G_FMINNUM/MAXNUM and G_FMINIMUM/MAXIMUM

[Michael Kitzan via Phabricator via llvm-commits]

mkitzan created this revision.
mkitzan added reviewers: aditya_nandakumar, paquette, dsanders, nlguillemot, arsenm.
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Herald added subscribers: hiraditya, kristof.beyls.
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I noticed https://reviews.llvm.org/D87415 added SDAG combines to fold FMIN/MAX instrs with NaNs.

The patch implements the same NaN combines for GISel GMIR FMIN/MAX opcodes:
G_FMINNUM(X, NaN) -> X
G_FMAXNUM(X, NaN) -> X
G_FMINIMUM(X, NaN) -> NaN
G_FMAXIMUM(X, NaN) -> NaN

The patch adds AArch64 tests for these combines as well.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D125819

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-fminimum-fmaximum.mir
  llvm/test/CodeGen/AArch64/GlobalISel/combine-fminnum-fmaxnum.mir

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