[all-commits] [llvm/llvm-project] a4e932: [HLSL] Implement RWBuffer::operator[] via __builti...

[Justin Bogner via All-commits]

  Branch: refs/heads/users/bogner/117017
  Home:   https://github.com/llvm/llvm-project
  Commit: a4e932c29bddb78bd287cabca2e9ea0da6c96337
      https://github.com/llvm/llvm-project/commit/a4e932c29bddb78bd287cabca2e9ea0da6c96337
  Author: Justin Bogner <mail at justinbogner.com>
  Date:   2024-11-20 (Wed, 20 Nov 2024)

  Changed paths:
    M clang/include/clang/Basic/Builtins.td
    M clang/include/clang/Basic/DiagnosticSemaKinds.td
    M clang/lib/AST/Type.cpp
    M clang/lib/CodeGen/CGBuiltin.cpp
    M clang/lib/Sema/HLSLExternalSemaSource.cpp
    M clang/lib/Sema/SemaExpr.cpp
    M clang/lib/Sema/SemaHLSL.cpp
    M clang/test/AST/HLSL/RWBuffer-AST.hlsl
    M clang/test/AST/HLSL/RWStructuredBuffer-AST.hlsl
    M clang/test/AST/HLSL/RasterizerOrderedStructuredBuffer-AST.hlsl
    M clang/test/AST/HLSL/StructuredBuffer-AST.hlsl
    M clang/test/CodeGenHLSL/builtins/RWBuffer-constructor.hlsl
    M clang/test/CodeGenHLSL/builtins/RWBuffer-elementtype.hlsl
    M clang/test/CodeGenHLSL/builtins/RWBuffer-subscript.hlsl
    M clang/test/CodeGenHLSL/builtins/RWStructuredBuffer-elementtype.hlsl
    M clang/test/CodeGenHLSL/builtins/RasterizerOrderedStructuredBuffer-elementtype.hlsl
    M clang/test/CodeGenHLSL/builtins/StructuredBuffer-elementtype.hlsl
    M clang/test/CodeGenHLSL/builtins/StructuredBuffers-constructors.hlsl
    M clang/test/CodeGenHLSL/builtins/StructuredBuffers-subscripts.hlsl
    M clang/test/CodeGenHLSL/builtins/hlsl_resource_t.hlsl
    M clang/test/CodeGenHLSL/implicit-norecurse-attrib.hlsl

  Log Message:
  -----------
  [HLSL] Implement RWBuffer::operator[] via __builtin_hlsl_resource_getpointer

This introduces `__builtin_hlsl_resource_getpointer`, which lowers to
`llvm.dx.resource.getpointer` and is used to implement indexing into resources.

This will only work through the backend for typed buffers at this point, but
the changes to structured buffers should be correct as far as the frontend is
concerned.

Note: We probably want this to return a reference in the HLSL device address
space, but for now we're just using address space 0. Creating a device address
space and updating this code can be done later as necessary.

Fixes #95956



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