Farzon Lotfi 5f4543fbaf [HLSL][Matrix] introduce MatrixElementExpr as accessor and swizzle operator (#171225) ...

fixes #159438

This patch adds `MatrixElementExpr`, a new AST node for HLSL matrix
element and swizzle access (e.g. M._m00, M._11_22_33).

It introduces a shared `ElementAccessExprBase` used by both matrix and
vector swizzle expressions, updates Sema to parse and validate
zero-based and one-based accessors, detects duplicates for l-value
checks, and emits improved diagnostics. CodeGen is updated to lower
scalar and multi-element accesses consistently, and full AST
serialization, dumping, and tooling support is included. This
implementation reflects the updated
[RFC](https://github.com/llvm/wg-hlsl/pull/357/files) for HLSL matrix
accessor semantics.

2026-02-06 13:16:49 -05:00

31 KiB

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