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Slang 64-bit Type Support
=========================
The Slang language supports 64 bit built in types. Such as
* double
* uint64_t
* int64_t
This also applies to vector and matrix versions of these types.
Unfortunately if a specific target supports the type or the typical HLSL instrinsic functions (such as sin/cos/max/min etc) depends very much on the target.
Note this initial testing only tested scalar usage, and not vector or matrix intrinsics.
Double support
==============
Target | Compiler/Binary | Double Type | Intrinsics | Notes
---------|------------------|----------------|-----------------------|-----------
CPU | | Yes | Yes | 1
CUDA | Nvrtx/PTX | Yes | Yes | 1
D3D12 | DXC/DXIL | Yes | No | 2
Vulkan | GlSlang/Spir-V | Yes | No | 3
D3D11 | FXC/DXBC | No | No |
D3D12 | FXC/DXBC | No | No |
1) CUDA and CPU support most intrinsics, with the notable exception currently of matrix invert
2) Requires SM 6.0 and above https://docs.microsoft.com/en-us/windows/win32/direct3dhlsl/hlsl-shader-model-6-0-features-for-direct3d-12
3) Restriction is described in https://www.khronos.org/registry/spir-v/specs/1.0/GLSL.std.450.html
Note that GlSlang does produce spir-v that contains double intrinsic calls, the failure happens when validating the Spir-V
```
Validation: error 0: [ UNASSIGNED-CoreValidation-Shader-InconsistentSpirv ] Object: VK_NULL_HANDLE (Type = 0) | SPIR-V module not valid: GLSL.std.450 Sin: expected Result Type to be a 16 or 32-bit scalar or vector float type
%57 = OpExtInst %double %1 Sin %56
```
D3D12 and VK may have some very limited intrinsic support such as sqrt, rsqrt
uint64_t Support
=================
Target | Compiler/Binary | uint64_t Type | Intrinsic support | Notes
---------|------------------|----------------|--------------------|--------
CPU | | Yes | Yes |
CUDA | Nvrtx/PTX | Yes | Yes |
D3D12 | DXC/DXIL | Yes | Yes |
Vulkan | GlSlang/Spir-V | Yes | Yes |
D3D11 | FXC/DXBC | No | No | 1
D3D12 | FXC/DXBC | No | No | 1
1) uint64_t support requires https://docs.microsoft.com/en-us/windows/win32/direct3dhlsl/hlsl-shader-model-6-0-features-for-direct3d-12, so DXBC is not a target.
The intrinsics available on uint64_t type are `abs`, `min`, `max`, `clamp` and `countbits`.
int64_t Support
================
Target | Compiler/Binary | int64_t Type | Intrinsic support | Notes
---------|------------------|----------------|--------------------|--------
CPU | | Yes | Yes |
CUDA | Nvrtx/PTX | Yes | Yes |
Vulkan | GlSlang/Spir-V | Yes | Yes |
D3D12 | DXC/DXIL | Yes | Yes | 1
D3D11 | FXC/DXBC | No | No | 2
D3D12 | FXC/DXBC | No | No | 2
1) The sm6.0 docs (https://docs.microsoft.com/en-us/windows/win32/direct3dhlsl/hlsl-shader-model-6-0-features-for-direct3d-12) describe only supports uint64_t, but the dxc compiler page says int64_t is supported in HLSL 2016 (https://github.com/Microsoft/DirectXShaderCompiler/wiki/Language-Versions). Tests show that this is indeed the case.
2) uint64_t support requires https://docs.microsoft.com/en-us/windows/win32/direct3dhlsl/hlsl-shader-model-6-0-features-for-direct3d-12, so DXBC is not a target.
The intrinsics available on uint64_t type are `abs`, `min`, `max` and `clamp`.
GLSL
====
GLSL/Spir-v based targets do not support 'generated' intrinsics on matrix types. For example 'sin(mat)' will not work on GLSL/Spir-v.
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