[all-commits] [llvm/llvm-project] 551cdb: [CodeGen][AMDGPU] Prepare rematerializer for subre...

[Lucas Ramirez via All-commits]

  Branch: refs/heads/users/lucas-rami/rematerializer-prepare-subreg-nfc
  Home:   https://github.com/llvm/llvm-project
  Commit: 551cdb00a2beffb939bd19f3025c27e3186d6957
      https://github.com/llvm/llvm-project/commit/551cdb00a2beffb939bd19f3025c27e3186d6957
  Author: Lucas Ramirez <lucas.rami at proton.me>
  Date:   2026-07-13 (Mon, 13 Jul 2026)

  Changed paths:
    M llvm/include/llvm/CodeGen/Rematerializer.h
    M llvm/lib/CodeGen/Rematerializer.cpp
    M llvm/lib/Target/AMDGPU/GCNSchedStrategy.cpp
    M llvm/unittests/CodeGen/RematerializerTest.cpp

  Log Message:
  -----------
  [CodeGen][AMDGPU] Prepare rematerializer for subreg remat support (NFC)

This makes some NFCs to the rematerializer before starting to improve
support for sub-register rematerialization. The main changes are the
replacement of `Rematerializer::Reg::Dependency` type (essentially a
pair of a machine operand index and a register index) in favor of a
simple register index, dropping the machine operand index. The latter
has no current uses and will lose meaning once we allow rematerializable
registers to be defined by multiple MIs. Similarly, and for the same
rationale, unrematerializable register dependencies are now tracked as
a register/lanemask pair instead of a machine operand index.

Other minor changes listed below.

- Removal of `DefRegion` argument to `Rematerializer::recreteReg`.
  Registers are always re-created in their original region so there is
  no need to set their region again.
- Removal of `InsertPos` unused argument to
  `Rematerializer::postRematerialization`.
- Refactor of how AMDGPU's scheduler checks whether a given register is
  rematerializable. This will make the future functional change for
  subreg support minimal.


  Commit: 2221883cc5f4d4b79473d5e004e50d7c29fe3c30
      https://github.com/llvm/llvm-project/commit/2221883cc5f4d4b79473d5e004e50d7c29fe3c30
  Author: Lucas Ramirez <lucas.rami at proton.me>
  Date:   2026-07-13 (Mon, 13 Jul 2026)

  Changed paths:
    M llvm/lib/CodeGen/Rematerializer.cpp

  Log Message:
  -----------
  Re-add include


  Commit: cf95ce8e7b257f7950ed762831af39b1820f39d2
      https://github.com/llvm/llvm-project/commit/cf95ce8e7b257f7950ed762831af39b1820f39d2
  Author: Lucas Ramirez <lucas.rami at proton.me>
  Date:   2026-07-13 (Mon, 13 Jul 2026)

  Changed paths:
    M llvm/lib/CodeGen/Rematerializer.cpp

  Log Message:
  -----------
  Add other missing include


Compare: https://github.com/llvm/llvm-project/compare/d92c8f4284b8...cf95ce8e7b25

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