[all-commits] [llvm/llvm-project] bc5dbb: [GlobalISel] Add matchers for constant splat.

[Abinav Puthan Purayil via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: bc5dbb0baee357649c3132254ca6766b5cd6f15b
      https://github.com/llvm/llvm-project/commit/bc5dbb0baee357649c3132254ca6766b5cd6f15b
  Author: Abinav Puthan Purayil <abinav.puthanpurayil at amd.com>
  Date:   2021-11-30 (Tue, 30 Nov 2021)

  Changed paths:
    M llvm/include/llvm/CodeGen/GlobalISel/MIPatternMatch.h
    M llvm/include/llvm/CodeGen/GlobalISel/Utils.h
    M llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
    M llvm/lib/CodeGen/GlobalISel/Utils.cpp
    M llvm/test/CodeGen/AMDGPU/GlobalISel/combine-fsh.mir
    M llvm/test/CodeGen/AMDGPU/GlobalISel/combine-rot.mir
    M llvm/unittests/CodeGen/GlobalISel/PatternMatchTest.cpp

  Log Message:
  -----------
  [GlobalISel] Add matchers for constant splat.

This change exposes isBuildVectorConstantSplat() to the llvm namespace
and uses it to implement the constant splat versions of
m_SpecificICst().

CombinerHelper::matchOrShiftToFunnelShift() can now work with vector
types and CombinerHelper::matchMulOBy2()'s match for a constant splat is
simplified.

Differential Revision: https://reviews.llvm.org/D114625