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llvm / llvm-project / 28b7d6621a70799705b04d2e08dc98a185151d3a
commit28b7d6621a70799705b04d2e08dc98a185151d3a[log] [tgz]
authorJay Foad <jay.foad@amd.com>Tue May 13 10:52:36 2025 +0100
committerGitHub <noreply@github.com>Tue May 13 10:52:36 2025 +0100
tree6254bd48e2b1cad8c698e35e4db18b39b10bde3d
parent671cef029fc13ea652ca6605b6b508c0d7332fa9 [diff]
[TableGen][CodeGen] Give every leaf register a unique regunit (#139526)

Give every leaf register a unique regunit, even if it has ad hoc
aliases.

Previously only leaf registers *without* ad hoc aliases would get a
unique regunit, but that caused situations where regunits could not be
used to distinguish a register from its subregs. For example:

- Registers A and B alias. They both get regunit 0 only.
- Register C has subregs A and B. It inherits regunits from its subregs,
  so it also gets regunit 0 only.

After this fix, registers A and B will get a unique regunit in addition
to the regunit representing the alias, for example:

- A will get regunits 0 and 1.
- B will get regunits 0 and 2.
- C will get regunits 0, 1 and 2.
3 files changed
tree: 6254bd48e2b1cad8c698e35e4db18b39b10bde3d
  1. .ci/
  2. .github/
  3. bolt/
  4. clang/
  5. clang-tools-extra/
  6. cmake/
  7. compiler-rt/
  8. cross-project-tests/
  9. flang/
  10. flang-rt/
  11. libc/
  12. libclc/
  13. libcxx/
  14. libcxxabi/
  15. libunwind/
  16. lld/
  17. lldb/
  18. llvm/
  19. llvm-libgcc/
  20. mlir/
  21. offload/
  22. openmp/
  23. polly/
  24. pstl/
  25. runtimes/
  26. third-party/
  27. utils/
  28. .clang-format
  29. .clang-format-ignore
  30. .clang-tidy
  31. .git-blame-ignore-revs
  32. .gitattributes
  33. .gitignore
  34. .mailmap
  35. CODE_OF_CONDUCT.md
  36. CONTRIBUTING.md
  37. LICENSE.TXT
  38. pyproject.toml
  39. README.md
  40. SECURITY.md
README.md

The LLVM Compiler Infrastructure

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Welcome to the LLVM project!

This repository contains the source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and run-time environments.

The LLVM project has multiple components. The core of the project is itself called “LLVM”. This contains all of the tools, libraries, and header files needed to process intermediate representations and convert them into object files. Tools include an assembler, disassembler, bitcode analyzer, and bitcode optimizer.

C-like languages use the Clang frontend. This component compiles C, C++, Objective-C, and Objective-C++ code into LLVM bitcode -- and from there into object files, using LLVM.

Other components include: the libc++ C++ standard library, the LLD linker, and more.

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For information on how to contribute to the LLVM project, please take a look at the Contributing to LLVM guide.

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