[all-commits] [llvm/llvm-project] eb1ea9: [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: eb1ea94f64e0a81448041568c979e54444234633
      https://github.com/llvm/llvm-project/commit/eb1ea94f64e0a81448041568c979e54444234633
  Author: Lucas Ramirez <lucas.rami at proton.me>
  Date:   2026-07-15 (Wed, 15 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: ac449f76cf2d85ceb1514d56556c0baadebd1f71
      https://github.com/llvm/llvm-project/commit/ac449f76cf2d85ceb1514d56556c0baadebd1f71
  Author: Lucas Ramirez <lucas.rami at proton.me>
  Date:   2026-07-15 (Wed, 15 Jul 2026)

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

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


  Commit: 1d269dc3bcd29e9dc00d7120d74736d11921f6ec
      https://github.com/llvm/llvm-project/commit/1d269dc3bcd29e9dc00d7120d74736d11921f6ec
  Author: Lucas Ramirez <lucas.rami at proton.me>
  Date:   2026-07-15 (Wed, 15 Jul 2026)

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

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


Compare: https://github.com/llvm/llvm-project/compare/569a46de2fa3...1d269dc3bcd2

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