[all-commits] [llvm/llvm-project] 549a95: [HLSL][Matrix] Add Matrix Layout Keywords (#192284)

[Farzon Lotfi via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 549a952fd53b14ee28ed898791e1a90be5c0940d
      https://github.com/llvm/llvm-project/commit/549a952fd53b14ee28ed898791e1a90be5c0940d
  Author: Farzon Lotfi <farzonlotfi at microsoft.com>
  Date:   2026-04-27 (Mon, 27 Apr 2026)

  Changed paths:
    M clang/include/clang/Basic/Attr.td
    M clang/include/clang/Basic/AttrDocs.td
    M clang/include/clang/Basic/DiagnosticSemaKinds.td
    M clang/include/clang/Basic/TokenKinds.def
    M clang/include/clang/Sema/SemaHLSL.h
    M clang/lib/Parse/ParseDecl.cpp
    M clang/lib/Parse/ParseTentative.cpp
    M clang/lib/Sema/SemaDeclAttr.cpp
    M clang/lib/Sema/SemaHLSL.cpp
    M clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
    A clang/test/AST/HLSL/matrix_layout_attr.hlsl
    A clang/test/Sema/hlsl_matrix_layout_non_hlsl.cpp
    A clang/test/SemaHLSL/matrix_layout_attr.hlsl

  Log Message:
  -----------
  [HLSL][Matrix] Add Matrix Layout Keywords (#192284)

fixes #192263

HLSL allows per-declaration matrix layout overrides via the row_major
and column_major keywords. Prior to this commit, matrix layout was only
controlled globally via the -fmatrix-memory-layout command-line flag
(LangOptions::DefaultMatrixMemoryLayout). This commit adds the parsing
and semantic analysis infrastructure needed to support per-declaration
layout, matching DXC behavior.


Assisted-by: Claude Opus 4.6



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