[all-commits] [llvm/llvm-project] a36278: [GlobalISel] Add G_UNMERGE(Cst) -> Cst1, Cst2, ......

[qcolombet via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: a36278c2f8b5ba7e964ef2cdc14ef8c3f8b8a045
      https://github.com/llvm/llvm-project/commit/a36278c2f8b5ba7e964ef2cdc14ef8c3f8b8a045
  Author: Quentin Colombet <qcolombet at apple.com>
  Date:   2020-09-14 (Mon, 14 Sep 2020)

  Changed paths:
    M llvm/include/llvm/CodeGen/GlobalISel/CombinerHelper.h
    M llvm/include/llvm/Target/GlobalISel/Combine.td
    M llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
    M llvm/test/CodeGen/AArch64/GlobalISel/combine-unmerge.mir
    M llvm/test/CodeGen/AMDGPU/GlobalISel/saddsat.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/sdiv.i64.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/srem.i64.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/ssubsat.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/udiv.i64.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/urem.i64.ll

  Log Message:
  -----------
  [GlobalISel] Add G_UNMERGE(Cst) -> Cst1, Cst2, ... combine

Add a combiner helper that replaces G_UNMERGE of big constants into direct
use of smaller constants.

Differential Revision: https://reviews.llvm.org/D87166