[all-commits] [llvm/llvm-project] fc27cb: [CodeGen] Add initial multi-def rematerialization ...

[Lucas Ramirez via All-commits]

  Branch: refs/heads/users/lucas-rami/rematerialize-subregs
  Home:   https://github.com/llvm/llvm-project
  Commit: fc27cbb7de0f4b2e5a043fcc856334e56f59db1a
      https://github.com/llvm/llvm-project/commit/fc27cbb7de0f4b2e5a043fcc856334e56f59db1a
  Author: Lucas Ramirez <lucas.rami at proton.me>
  Date:   2026-07-16 (Thu, 16 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/lib/Target/AMDGPU/SIInstrInfo.cpp
    M llvm/test/CodeGen/AMDGPU/machine-scheduler-sink-trivial-remats.mir
    M llvm/unittests/CodeGen/RematerializerTest.cpp

  Log Message:
  -----------
  [CodeGen] Add initial multi-def rematerialization support

This significantly improves support for rematerializing registers
with more than one definition. In particular, this includes cases where
different lanes of a register are defined over multiple instructions.

There are still a few restrictions that can hopefully be relaxed in the
future.

- All defining instructions must be part of the same rematerialization
  region.
- No pure user of the register (i.e., an MI that doesn't also defined a
  part of the register) must read the register before its last
  definition.

These constraints ensure that the underlying DAG representation
maintained by the rematerializer is still valid, making this a
relatively incremental improvement.


  Commit: 1d418f9d5031223fcddb00b6f212604ae987c804
      https://github.com/llvm/llvm-project/commit/1d418f9d5031223fcddb00b6f212604ae987c804
  Author: Lucas Ramirez <lucas.rami at proton.me>
  Date:   2026-07-16 (Thu, 16 Jul 2026)

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

  Log Message:
  -----------
  Use is_contained


  Commit: e44a8d4910d0817b04d16e060f34a3e0575b49ce
      https://github.com/llvm/llvm-project/commit/e44a8d4910d0817b04d16e060f34a3e0575b49ce
  Author: Lucas Ramirez <lucas.rami at proton.me>
  Date:   2026-07-16 (Thu, 16 Jul 2026)

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

  Log Message:
  -----------
  Stray debug + inline closure


  Commit: c7127935b4c0e0ec2ffcf1c80f2a80b3ed4cd59b
      https://github.com/llvm/llvm-project/commit/c7127935b4c0e0ec2ffcf1c80f2a80b3ed4cd59b
  Author: Lucas Ramirez <lucas.rami at proton.me>
  Date:   2026-07-16 (Thu, 16 Jul 2026)

  Changed paths:
    M llvm/test/CodeGen/AMDGPU/sched_mfma_rewrite_copies.mir

  Log Message:
  -----------
  Fix failing test


Compare: https://github.com/llvm/llvm-project/compare/79cdfaaf5b0f...c7127935b4c0

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