[clang] [Matrix][HLSL] Add codegen support for Matrix Layout keywords (PR #198887)

[via cfe-commits]

github-actions[bot] wrote:


# :penguin: Linux x64 Test Results

* 88173 tests passed
* 1641 tests skipped
* 2 tests failed

## Failed Tests
(click on a test name to see its output)

### Clang

Clang.Driver/hip-toolchain-no-rdc.hip

```
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 1
rm -rf 
/home/gha/actions-runner/_work/llvm-project/llvm-project/build/tools/clang/test/Driver/Output/hip-toolchain-no-rdc.hip.tmp
 && mkdir 
/home/gha/actions-runner/_work/llvm-project/llvm-project/build/tools/clang/test/Driver/Output/hip-toolchain-no-rdc.hip.tmp
# executed command: rm -rf 
/home/gha/actions-runner/_work/llvm-project/llvm-project/build/tools/clang/test/Driver/Output/hip-toolchain-no-rdc.hip.tmp
# note: command had no output on stdout or stderr
# executed command: mkdir 
/home/gha/actions-runner/_work/llvm-project/llvm-project/build/tools/clang/test/Driver/Output/hip-toolchain-no-rdc.hip.tmp
# note: command had no output on stdout or stderr
# RUN: at line 2
/home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/clang -### 
--target=x86_64-linux-gnu -fno-gpu-rdc-x hip --cuda-gpu-arch=gfx803 
--cuda-gpu-arch=gfx900--hip-device-lib=lib1.bc --hip-device-lib=lib2.bc
--hip-device-lib-path=/home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/Driver/Inputs/hip_multiple_inputs/lib1

--hip-device-lib-path=/home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/Driver/Inputs/hip_multiple_inputs/lib2
-fuse-ld=lld 
-B/home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/Driver/Inputs/lld
 -nogpuinc --no-offload-new-driver
/home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/Driver/Inputs/hip_multiple_inputs/a.cu

/home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/Driver/Inputs/hip_multiple_inputs/b.hip
  2>&1 | 
/home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/FileCheck 
-check-prefixes=CHECK,LINK,OLD 
/home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/Driver/hip-toolchain-no-rdc.hip
# executed command: 
/home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/clang '-###' 
--target=x86_64-linux-gnu -fno-gpu-rdc -x hip --cuda-gpu-arch=gfx803 
--cuda-gpu-arch=gfx900 --hip-device-lib=lib1.bc --hip-device-lib=lib2.bc 
--hip-device-lib-path=/home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/Driver/Inputs/hip_multiple_inputs/lib1
 
--hip-device-lib-path=/home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/Driver/Inputs/hip_multiple_inputs/lib2
 -fuse-ld=lld 
-B/home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/Driver/Inputs/lld
 -nogpuinc --no-offload-new-driver 
/home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/Driver/Inputs/hip_multiple_inputs/a.cu
 
/home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/Driver/Inputs/hip_multiple_inputs/b.hip
# note: command had no output on stdout or stderr
# executed command: 
/home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/FileCheck 
-check-prefixes=CHECK,LINK,OLD 
/home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/Driver/hip-toolchain-no-rdc.hip
# note: command had no output on stdout or stderr
# RUN: at line 12
/home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/clang -### 
--target=x86_64-linux-gnu -fno-gpu-rdc-x hip --cuda-gpu-arch=gfx803 
--cuda-gpu-arch=gfx900--hip-device-lib=lib1.bc --hip-device-lib=lib2.bc
--hip-device-lib-path=/home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/Driver/Inputs/hip_multiple_inputs/lib1

--hip-device-lib-path=/home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/Driver/Inputs/hip_multiple_inputs/lib2
-fuse-ld=lld 
-B/home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/Driver/Inputs/lld
 -nogpuinc -c --no-offload-new-driver
/home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/Driver/Inputs/hip_multiple_inputs/a.cu

/home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/Driver/Inputs/hip_multiple_inputs/b.hip
  2>&1 | 
/home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/FileCheck 
-check-prefixes=CHECK,OLD 
/home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/Driver/hip-toolchain-no-rdc.hip
# executed command: 
/home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/clang '-###' 
--target=x86_64-linux-gnu -fno-gpu-rdc -x hip --cuda-gpu-arch=gfx803 
--cuda-gpu-arch=gfx900 --hip-device-lib=lib1.bc --hip-device-lib=lib2.bc 
--hip-device-lib-path=/home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/Driver/Inputs/hip_multiple_inputs/lib1
 
--hip-device-lib-path=/home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/Driver/Inputs/hip_multiple_inputs/lib2
 -fuse-ld=lld 
-B/home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/Driver/Inputs/lld
 -nogpuinc -c --no-offload-new-driver 
/h

[clang] [Matrix][HLSL] Add codegen support for Matrix Layout keywords (PR #198887)

[Farzon Lotfi via cfe-commits]

https://github.com/farzonl auto_merge_enabled 
https://github.com/llvm/llvm-project/pull/198887
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[clang] [Matrix][HLSL] Add codegen support for Matrix Layout keywords (PR #198887)

[Farzon Lotfi via cfe-commits]

farzonl wrote:

test failures are unrelated:
```
Failed Tests (2):
  Clang :: Driver/hip-toolchain-no-rdc.hip
  Clang :: Driver/hipspv-toolchain.hip
```

https://github.com/llvm/llvm-project/pull/198887
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[clang] [Matrix][HLSL] Add codegen support for Matrix Layout keywords (PR #198887)

[Farzon Lotfi via cfe-commits]

https://github.com/farzonl updated 
https://github.com/llvm/llvm-project/pull/198887

>From 656f637d6da026c6fc0491ef0bcfc2b3c644a5fb Mon Sep 17 00:00:00 2001
From: Farzon Lotfi 
Date: Mon, 4 May 2026 12:10:08 -0400
Subject: [PATCH 01/10] [Matrix][HLSL] Add codgen support for Matrix Layout
 keywords

fixes #192262

- Wrap Matrix Type in HLSLMatrixLayoutArrr
- Add Helper to know which Matrix Layout to apply in codegen or check for in 
Sema
---
 clang/include/clang/AST/MatrixUtils.h |  71 +++
 clang/include/clang/Basic/Attr.td |  16 ++
 clang/lib/AST/TypePrinter.cpp |  20 ++
 clang/lib/CodeGen/CGExpr.cpp  |  17 +-
 clang/lib/CodeGen/CGExprConstant.cpp  |   4 +-
 clang/lib/CodeGen/CGExprScalar.cpp|  22 ++-
 clang/lib/CodeGen/CGHLSLBuiltins.cpp  |   9 +-
 clang/lib/CodeGen/CodeGenTypes.cpp|   5 +-
 clang/lib/Sema/SemaHLSL.cpp   |  79 
 clang/test/AST/HLSL/matrix_layout_attr.hlsl   |  11 ++
 .../matrix-layout-attr-overrides-default.hlsl | 175 ++
 11 files changed, 400 insertions(+), 29 deletions(-)
 create mode 100644 clang/include/clang/AST/MatrixUtils.h
 create mode 100644 
clang/test/CodeGenHLSL/matrix-layout-attr-overrides-default.hlsl

diff --git a/clang/include/clang/AST/MatrixUtils.h 
b/clang/include/clang/AST/MatrixUtils.h
new file mode 100644
index 0..d1b351bf4b07b
--- /dev/null
+++ b/clang/include/clang/AST/MatrixUtils.h
@@ -0,0 +1,71 @@
+//===- MatrixUtils.h - Matrix AST utilities -*- C++ 
-*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM 
Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===--===//
+//
+/// \file
+/// Defines AST-level helper utilities for matrix types.
+//
+//===--===//
+
+#ifndef LLVM_CLANG_AST_MATRIXUTILS_H
+#define LLVM_CLANG_AST_MATRIXUTILS_H
+
+#include "clang/AST/Type.h"
+#include "clang/Basic/AttrKinds.h"
+#include "clang/Basic/LangOptions.h"
+
+namespace clang {
+/// Returns true if matrices of \p T should be laid out in row-major order.
+///
+/// In HLSL mode, an `HLSLRowMajor` / `HLSLColumnMajor` AttributedType anywhere
+/// in the sugar chain of \p T (imprinted by Sema when a source decl carries
+/// `[[hlsl::row_major]]` / `[[hlsl::column_major]]`) takes precedence over the
+/// `-fmatrix-memory-layout=` default carried in \p LangOpts. Otherwise the
+/// LangOptions default is used.
+inline bool isMatrixRowMajor(const LangOptions &LangOpts, QualType T) {
+  if (LangOpts.HLSL && !T.isNull()) {
+QualType Cur = T;
+while (const auto *AT = Cur->getAs()) {
+  switch (AT->getAttrKind()) {
+  case attr::HLSLRowMajor:
+return true;
+  case attr::HLSLColumnMajor:
+return false;
+  default:
+break;
+  }
+  Cur = AT->getModifiedType();
+}
+  }
+  return LangOpts.getDefaultMatrixMemoryLayout() ==
+ LangOptions::MatrixMemoryLayout::MatrixRowMajor;
+}
+
+/// Returns true if matrices of \p T should be laid out in column-major order.
+/// Mirrors `isMatrixRowMajor`; per-decl HLSL attributes win over the
+/// `-fmatrix-memory-layout=` default.
+inline bool isMatrixColumnMajor(const LangOptions &LangOpts, QualType T) {
+  if (LangOpts.HLSL && !T.isNull()) {
+QualType Cur = T;
+while (const auto *AT = Cur->getAs()) {
+  switch (AT->getAttrKind()) {
+  case attr::HLSLColumnMajor:
+return true;
+  case attr::HLSLRowMajor:
+return false;
+  default:
+break;
+  }
+  Cur = AT->getModifiedType();
+}
+  }
+  return LangOpts.getDefaultMatrixMemoryLayout() ==
+ LangOptions::MatrixMemoryLayout::MatrixColMajor;
+}
+} // namespace clang
+
+#endif // LLVM_CLANG_AST_MATRIXUTILS_H
diff --git a/clang/include/clang/Basic/Attr.td 
b/clang/include/clang/Basic/Attr.td
index 32f72e8da960e..accb3ca3c4ce7 100644
--- a/clang/include/clang/Basic/Attr.td
+++ b/clang/include/clang/Basic/Attr.td
@@ -5299,6 +5299,22 @@ def HLSLMatrixLayout : InheritableAttr {
   let Documentation = [HLSLMatrixLayoutDocs];
 }
 
+// Internal type-attribute markers attached to matrix QualTypes by Sema when
+// a decl carries `[[hlsl::row_major]]` / `[[hlsl::column_major]]`. They let
+// CodeGen / const-eval recover the layout from any matrix-typed expression
+// without re-walking back to the source decl.
+def HLSLRowMajor : TypeAttr {
+  let Spellings = [];
+  let LangOpts = [HLSL];
+  let Documentation = [InternalOnly];
+}
+
+def HLSLColumnMajor : TypeAttr {
+  let Spellings = [];
+  let LangOpts = [HLSL];
+  let Documentation = [InternalOnly];
+}
+
 def RandomizeLayout : InheritableAttr {
   let Spellings = [GCC<"randomize_layout">];
   let Subjects = SubjectList<[Record]>;
diff -

[clang] [Matrix][HLSL] Add codegen support for Matrix Layout keywords (PR #198887)

[Farzon Lotfi via cfe-commits]

@@ -2704,60 +2704,76 @@ static bool isMatrixOrArrayOfMatrix(const ASTContext 
&Ctx, QualType QT) {
   return Ty->isDependentType() || Ty->isConstantMatrixType();
 }
 
-static bool diagnoseMatrixLayoutOnNonMatrix(Sema &SemaRef, Decl *D,
-SourceLocation Loc,
-const IdentifierInfo *AttrName) {
-  QualType Ty;
-  if (auto *VD = dyn_cast(D))
-Ty = VD->getType();
-  else if (auto *TD = dyn_cast(D))
-Ty = TD->getUnderlyingType();
-
-  if (Ty.isNull() || Ty->isDependentType())
-return false;
-
-  // For functions, the qualifier can apply to the return type or any 
parameter.
-  if (const auto *FPT = Ty->getAs()) {
-if (isMatrixOrArrayOfMatrix(SemaRef.getASTContext(), FPT->getReturnType()))
-  return false;
-SemaRef.Diag(Loc, diag::err_hlsl_matrix_layout_non_matrix) << AttrName;
-return true;
+/// Walks the existing AttributedType sugar of \p T looking for a previously
+/// applied HLSLRowMajor/HLSLColumnMajor marker. If one is found, populates
+/// \p ExistingKind with its attr::Kind and returns true.
+static bool findExistingMatrixLayoutMarker(QualType T,
+   attr::Kind &ExistingKind) {
+  QualType Cur = T;
+  while (const auto *AT = Cur->getAs()) {
+attr::Kind K = AT->getAttrKind();
+if (K == attr::HLSLRowMajor || K == attr::HLSLColumnMajor) {
+  ExistingKind = K;
+  return true;
+}
+Cur = AT->getModifiedType();
   }
+  return false;
+}
 
-  if (isMatrixOrArrayOfMatrix(SemaRef.getASTContext(), Ty))
-return false;
+Attr *SemaHLSL::buildMatrixLayoutTypeAttr(QualType T, const ParsedAttr &AL) {
+  ASTContext &Ctx = getASTContext();
+  attr::Kind AttrK = AL.getKind() == ParsedAttr::AT_HLSLRowMajor
+ ? attr::HLSLRowMajor
+ : attr::HLSLColumnMajor;
 
-  SemaRef.Diag(Loc, diag::err_hlsl_matrix_layout_non_matrix) << AttrName;
-  return true;
-}
+  if (T.isNull())
+return nullptr;
 
-void SemaHLSL::handleMatrixLayoutAttr(Decl *D, const ParsedAttr &AL) {
-  // row_major and column_major are only valid on matrix types.
-  if (diagnoseMatrixLayoutOnNonMatrix(SemaRef, D, AL.getLoc(),
-  AL.getAttrName()))
-return;
+  // For non-dependent types, the operand must be a matrix (or array of
+  // matrices).
+  if (!T->isDependentType() && !isMatrixOrArrayOfMatrix(Ctx, T)) {
+Diag(AL.getLoc(), diag::err_hlsl_matrix_layout_non_matrix)
+<< AL.getAttrName();
+AL.setInvalid();
+return nullptr;
+  }
 
-  // Check for conflicting or duplicate matrix layout attributes.
-  if (const auto *Existing = D->getAttr()) {
-if (Existing->getSemanticSpelling() != AL.getSemanticSpelling()) {
-  Diag(AL.getLoc(), diag::err_hlsl_matrix_layout_conflict)
-  << AL.getAttrName() << Existing->getAttrName();
-  Diag(Existing->getLoc(), diag::note_conflicting_attribute);
-} else {
+  // Conflict / duplicate detection by walking existing sugar.
+  attr::Kind ExistingKind;
+  if (findExistingMatrixLayoutMarker(T, ExistingKind)) {
+if (ExistingKind == AttrK) {
   Diag(AL.getLoc(), diag::warn_duplicate_attribute_exact)
   << AL.getAttrName();
-  Diag(Existing->getLoc(), diag::note_previous_attribute);
+  Diag(AL.getLoc(), diag::note_previous_attribute);
+  return nullptr;
 }
-return;
+IdentifierInfo *ExistingII = &Ctx.Idents.get(
+ExistingKind == attr::HLSLRowMajor ? "row_major" : "column_major");
+Diag(AL.getLoc(), diag::err_hlsl_matrix_layout_conflict)
+<< AL.getAttrName() << ExistingII;
+Diag(AL.getLoc(), diag::note_conflicting_attribute);
+AL.setInvalid();
+return nullptr;
   }
 
-  D->addAttr(::new (getASTContext()) HLSLMatrixLayoutAttr(getASTContext(), 
AL));
+  if (AttrK == attr::HLSLRowMajor)
+return ::new (Ctx) HLSLRowMajorAttr(Ctx, AL);
+  return ::new (Ctx) HLSLColumnMajorAttr(Ctx, AL);
 }
 
-bool SemaHLSL::diagnoseInstantiatedMatrixLayoutAttr(
-Decl *D, const HLSLMatrixLayoutAttr *Attr) {
-  return diagnoseMatrixLayoutOnNonMatrix(SemaRef, D, Attr->getLoc(),
- Attr->getAttrName());
+bool SemaHLSL::diagnoseMatrixLayoutInstantiation(attr::Kind K, QualType T,
+ SourceLocation Loc) {

farzonl wrote:

actually just fed in my comment to claude and it thinks this is better

```
// Re-validates an HLSL `row_major` / `column_major` attribute after template
// substitution. The parse-time check in `buildMatrixLayoutTypeAttr` is skipped
// for dependent types; `TransformAttributedType` calls this once the type is
// concrete. Returns `true` (and emits a diagnostic) if the substituted type is
// not a matrix or array of matrices, signaling the caller to abort the
// transform.
```

https://github.com/llvm/llvm-project/pull/198887
_

[clang] [Matrix][HLSL] Add codegen support for Matrix Layout keywords (PR #198887)

[Farzon Lotfi via cfe-commits]

@@ -2704,60 +2704,76 @@ static bool isMatrixOrArrayOfMatrix(const ASTContext 
&Ctx, QualType QT) {
   return Ty->isDependentType() || Ty->isConstantMatrixType();
 }
 
-static bool diagnoseMatrixLayoutOnNonMatrix(Sema &SemaRef, Decl *D,
-SourceLocation Loc,
-const IdentifierInfo *AttrName) {
-  QualType Ty;
-  if (auto *VD = dyn_cast(D))
-Ty = VD->getType();
-  else if (auto *TD = dyn_cast(D))
-Ty = TD->getUnderlyingType();
-
-  if (Ty.isNull() || Ty->isDependentType())
-return false;
-
-  // For functions, the qualifier can apply to the return type or any 
parameter.
-  if (const auto *FPT = Ty->getAs()) {
-if (isMatrixOrArrayOfMatrix(SemaRef.getASTContext(), FPT->getReturnType()))
-  return false;
-SemaRef.Diag(Loc, diag::err_hlsl_matrix_layout_non_matrix) << AttrName;
-return true;
+/// Walks the existing AttributedType sugar of \p T looking for a previously
+/// applied HLSLRowMajor/HLSLColumnMajor marker. If one is found, populates
+/// \p ExistingKind with its attr::Kind and returns true.
+static bool findExistingMatrixLayoutMarker(QualType T,
+   attr::Kind &ExistingKind) {
+  QualType Cur = T;
+  while (const auto *AT = Cur->getAs()) {
+attr::Kind K = AT->getAttrKind();
+if (K == attr::HLSLRowMajor || K == attr::HLSLColumnMajor) {
+  ExistingKind = K;
+  return true;
+}
+Cur = AT->getModifiedType();
   }
+  return false;
+}
 
-  if (isMatrixOrArrayOfMatrix(SemaRef.getASTContext(), Ty))
-return false;
+Attr *SemaHLSL::buildMatrixLayoutTypeAttr(QualType T, const ParsedAttr &AL) {
+  ASTContext &Ctx = getASTContext();
+  attr::Kind AttrK = AL.getKind() == ParsedAttr::AT_HLSLRowMajor
+ ? attr::HLSLRowMajor
+ : attr::HLSLColumnMajor;
 
-  SemaRef.Diag(Loc, diag::err_hlsl_matrix_layout_non_matrix) << AttrName;
-  return true;
-}
+  if (T.isNull())
+return nullptr;
 
-void SemaHLSL::handleMatrixLayoutAttr(Decl *D, const ParsedAttr &AL) {
-  // row_major and column_major are only valid on matrix types.
-  if (diagnoseMatrixLayoutOnNonMatrix(SemaRef, D, AL.getLoc(),
-  AL.getAttrName()))
-return;
+  // For non-dependent types, the operand must be a matrix (or array of
+  // matrices).
+  if (!T->isDependentType() && !isMatrixOrArrayOfMatrix(Ctx, T)) {
+Diag(AL.getLoc(), diag::err_hlsl_matrix_layout_non_matrix)
+<< AL.getAttrName();
+AL.setInvalid();
+return nullptr;
+  }
 
-  // Check for conflicting or duplicate matrix layout attributes.
-  if (const auto *Existing = D->getAttr()) {
-if (Existing->getSemanticSpelling() != AL.getSemanticSpelling()) {
-  Diag(AL.getLoc(), diag::err_hlsl_matrix_layout_conflict)
-  << AL.getAttrName() << Existing->getAttrName();
-  Diag(Existing->getLoc(), diag::note_conflicting_attribute);
-} else {
+  // Conflict / duplicate detection by walking existing sugar.
+  attr::Kind ExistingKind;
+  if (findExistingMatrixLayoutMarker(T, ExistingKind)) {
+if (ExistingKind == AttrK) {
   Diag(AL.getLoc(), diag::warn_duplicate_attribute_exact)
   << AL.getAttrName();
-  Diag(Existing->getLoc(), diag::note_previous_attribute);
+  Diag(AL.getLoc(), diag::note_previous_attribute);
+  return nullptr;
 }
-return;
+IdentifierInfo *ExistingII = &Ctx.Idents.get(
+ExistingKind == attr::HLSLRowMajor ? "row_major" : "column_major");
+Diag(AL.getLoc(), diag::err_hlsl_matrix_layout_conflict)
+<< AL.getAttrName() << ExistingII;
+Diag(AL.getLoc(), diag::note_conflicting_attribute);
+AL.setInvalid();
+return nullptr;
   }
 
-  D->addAttr(::new (getASTContext()) HLSLMatrixLayoutAttr(getASTContext(), 
AL));
+  if (AttrK == attr::HLSLRowMajor)
+return ::new (Ctx) HLSLRowMajorAttr(Ctx, AL);
+  return ::new (Ctx) HLSLColumnMajorAttr(Ctx, AL);
 }
 
-bool SemaHLSL::diagnoseInstantiatedMatrixLayoutAttr(
-Decl *D, const HLSLMatrixLayoutAttr *Attr) {
-  return diagnoseMatrixLayoutOnNonMatrix(SemaRef, D, Attr->getLoc(),
- Attr->getAttrName());
+bool SemaHLSL::diagnoseMatrixLayoutInstantiation(attr::Kind K, QualType T,
+ SourceLocation Loc) {

farzonl wrote:

Something like this:
```
//  At parse time, row_major/column_major are validated to apply to a matrix.
//  But in a template the attribute is attached to a dependent type. This helper
//  catches the matrix layout at instantiation time.
```

https://github.com/llvm/llvm-project/pull/198887
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