[HLSL] Array by-value casting

[llvm-beanz]

In HLSL arrays generally don't decay to pointers, and explicit array casts historically were by-value casts of the elements. There is some incongruence between existing HLSL implementations. FXC and DXC's SPIR-V code generation do by-value conversions and DXC's DXIL code generation does a pointer conversion.

See DXC on Compiler Explorer and FXC on Shader Playground

[llvmbot]

@llvm/issue-subscribers-clang-frontend

Author: Chris B (llvm-beanz)

In HLSL arrays generally don't decay to pointers, and explicit array casts historically were by-value casts of the elements. There is some incongruence between existing HLSL implementations. FXC and DXC's SPIR-V code generation do by-value conversions and DXC's DXIL code generation does a pointer conversion.

See DXC on Compiler Explorer and FXC on Shader Playground

[llvmbot]

@llvm/issue-subscribers-clang-codegen

Author: Chris B (llvm-beanz)

In HLSL arrays generally don't decay to pointers, and explicit array casts historically were by-value casts of the elements. There is some incongruence between existing HLSL implementations. FXC and DXC's SPIR-V code generation do by-value conversions and DXC's DXIL code generation does a pointer conversion.

See DXC on Compiler Explorer and FXC on Shader Playground