Add minutes for HLSL Working Group meeting on 2026-04-30

[farzonl]

This covers discussion topics known and to be added during the meeting.

[farzonl]

Problem:

• per-call-site discovery is a problem. We don't always have access to the Decl in codegen

Solution:

• Carry it on the type via AttributedType sugar
• The layout becomes a property of the matrix value's type, which is exactly what the language semantics say it is.
• When Sema applies hlsl::row_major to a VarDecl/FieldDecl/TypedefDecl, also wrap the declared QualType in AttributedType(attr_hlsl_row_major, …, ConstantMatrixType). Field/var/typedef types already propagate through MemberExpr/DeclRefExpr, so any Expr of matrix type carries the attribute on its QualType. Helper becomes isMatrixRowMajor(LangOpts, QualType)
  — no Decl ever needed at the call site.

Pros:

• Eliminates all walking. Every existing call site already has a QualType. Naturally survives template instantiation, auto, casts that preserve sugar.
• Matches how HLSL resource attributes are already modeled (HLSLAttributedResourceType).

Cons:

• Bigger Sema change (need to actually mutate the declared type when the attr is parsed)
• and you need a new attr::HLSLRowMajor / HLSLColumnMajor kind in Attr.td so AttributedType recognizes them.

[farzonl]

Suggested change

	* * Discuss SPIR-V Validator (spirv-val) failures and resolutions:
	* Constant Buffer Discussions
	* No Resource buffers in constant buffer
	* Add const? We have to allow calls to non-const.
	* 202y we migrate. Use clang-tidy to only allow calls to const
	* Discuss SPIR-V Validator (spirv-val) failures and resolutions: