[all-commits] [llvm/llvm-project] 63a4b4: [GlobalIsel] Combine logic of floating point compa...

[Thorsten Schütt via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 63a4b4f610e729ee71758bdc29da10faf5b943b4
      https://github.com/llvm/llvm-project/commit/63a4b4f610e729ee71758bdc29da10faf5b943b4
  Author: Thorsten Schütt <schuett at gmail.com>
  Date:   2024-02-20 (Tue, 20 Feb 2024)

  Changed paths:
    M llvm/include/llvm/CodeGen/GlobalISel/CombinerHelper.h
    M llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
    M llvm/test/CodeGen/AArch64/GlobalISel/combine-logic-of-compare.mir

  Log Message:
  -----------
  [GlobalIsel] Combine logic of floating point compares (#81886)

It is purely based on symmetry. Registers can be scalars, vectors, and
non-constants.

X < 5.0 || X > 5.0
  ->
X != 5.0

X < Y && X > Y
  ->
  FCMP_FALSE

X < Y && X < Y
  ->
  FCMP_TRUE

see InstCombinerImpl::foldLogicOfFCmps



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