[all-commits] [llvm/llvm-project] 16204d: [AMDGPU] Canonicalize G_ZEXT of the shift amount i...

[Pierre van Houtryve via All-commits]

  Branch: refs/heads/users/pierre-vh/zext-shiftamt-gisel
  Home:   https://github.com/llvm/llvm-project
  Commit: 16204d51347ddbd7e5caff660d07069d7e441cac
      https://github.com/llvm/llvm-project/commit/16204d51347ddbd7e5caff660d07069d7e441cac
  Author: pvanhout <pierre.vanhoutryve at amd.com>
  Date:   2025-03-17 (Mon, 17 Mar 2025)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPUCombine.td
    M llvm/lib/Target/AMDGPU/AMDGPURegBankCombiner.cpp
    A llvm/test/CodeGen/AMDGPU/GlobalISel/combine-shift-amount-zext.mir

  Log Message:
  -----------
  [AMDGPU] Canonicalize G_ZEXT of the shift amount in RegBankCombiner

Canonicalize it to a G_AND instead so that ISel patterns can pick it
up and ignore it, as the shift instructions only read low bits.
G_ZEXT would be lowered to a v/s_and anyway in most cases.



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