| Issue |
95956
|
| Summary |
[HLSL] Introduce builtins to index into HLSLResource types
|
| Labels |
HLSL
|
| Assignees |
|
| Reporter |
bogner
|
We need a builtin in clang that can operate on HLSLResource builtin types to index into them. There are two approaches to this:
1. Have `__builtin_hlsl_resource_index(resource_t x)` return a pointer to the underlying type, which we then load and store directly
2. Have `__builtin_hlsl_resource_index(resource_t x)` return another `resource_t`, and introduce `__builtin_hlsl_resource_load` and `__builtin_hlsl_resource_store` as well.
Option (1) is probably sufficient and simpler for the `dx.RawBuffer` types (StructuredBuffers and ByteAddressBuffers), but it may be harder to form the right operations for `dx.TypedBuffer` and `dx.CBuffer` types. Option (2) is more complex and should be used if option (1) is found to be untenable.
AC:
- These builtins are available and lower to DXIL intrinsics during clang codegen
- Array subscript operators for HLSL resource types can be implemented using these builtins
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