HLSL instrinsics are not in the global namespace, and can't be disambiguated using ::

[devshgraphicsprogramming]

Description

Suppose I make a method (static or not) that is called dot, if that calls dot within itself is impossible to disambiguate and force the of the global instrinsic function dot

Steps to Reproduce

template<typename T>
struct Functor
{
    static inline float dot(const in T lhs, const in T rhs)
    {
        return ::dot(lhs,rhs);
    }
};

void main()
{
    float32_t3 v = float32_t3(4,5,6);
    vk::RawBufferStore(0xdeadbeefull,Functor<float32_t3>::dot(v,v));
}

https://godbolt.org/z/GTjzE511j

Actual Behavior

<source>:9:16: error: no member named 'dot' in the global namespace; did you mean simply 'dot'?
        return ::dot(lhs,rhs);
               ^~~~~
               dot
<source>:7:25: note: 'dot' declared here
    static inline float dot(const in T lhs, const in T rhs)
                        ^

Environment

• DXC version : latest trunk
• Host Operating System: Godbolt

[llvm-beanz]

HLSL isn't really C++, so this isn't expected to be valid with HLSL 2021 and earlier builtin resolution rules (which are a bit special). We do have this related proposal:

https://github.com/microsoft/hlsl-specs/blob/main/proposals/0001-hlsl-namespace.md

Which would move all the HLSL builtin functions into the hlsl namespace in a future language version. We're actually implementing it that way in Clang from the start, so you will have a better experience in Clang, but I don't think this is likely to be fixed in DXC.

[damyanp]

No plans to address this in DXC. The plan going forward in clang addresses this.