[all-commits] [llvm/llvm-project] 915afa: [AMDGPU][GlobalISel] Keep typed LLTs in RegBankLeg...

[Chinmay Deshpande via All-commits]

  Branch: refs/heads/users/chinmaydd/amdgpu-rbl-combiner-typed-llt
  Home:   https://github.com/llvm/llvm-project
  Commit: 915afaa7e3b750011f98a5cf086a7856c7f92fde
      https://github.com/llvm/llvm-project/commit/915afaa7e3b750011f98a5cf086a7856c7f92fde
  Author: Chinmay Deshpande <chdeshpa at amd.com>
  Date:   2026-09-29 (Tue, 29 Sep 2026)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPURegBankLegalize.cpp
    A llvm/test/CodeGen/AMDGPU/GlobalISel/regbanklegalize-combine-s1.mir
    M llvm/test/CodeGen/AMDGPU/GlobalISel/regbankselect-anyext.mir
    M llvm/test/CodeGen/AMDGPU/GlobalISel/regbankselect-mui-regbanklegalize.mir
    M llvm/test/CodeGen/AMDGPU/GlobalISel/regbankselect-mui.mir

  Log Message:
  -----------
  [AMDGPU][GlobalISel] Keep typed LLTs in RegBankLegalize combines

The S1 cleanup combines in AMDGPURegBankLegalize built new registers
with an untyped s32, missed when lowering switched to extended LLTs.
The regbank combiner later unified these with typed registers, so
constrainRegAttrs retyped e.g. an i32 G_CTPOP result to s32, which
failed instruction selection.

Take the type from the source or destination register instead.

Change-Id: I06cfb7278af045dbaa3ca0cc6c77a3938f4cef01
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply at anthropic.com>



To unsubscribe from these emails, change your notification settings at https://github.com/llvm/llvm-project/settings/notifications