| Issue |
147717
|
| Summary |
[SPIRV] The clang-dxc enables SPV extension not allowed in Vulkan
|
| Labels |
HLSL,
backend:SPIR-V
|
| Assignees |
s-perron
|
| Reporter |
s-perron
|
When the `-fspv-extension` is not on the command line it is suppose to enable "all" SPIR-V extensions. This is implemented in Clang by passing the `-spv-ext=all` to the SPIR-V backend. In the DXC context, this did not require any qualifications because if an extension was not used in Vulkan, it was not part of the compiler. However, the SPIR-V backend in Clang generates code for OpenCL as well, and uses extensions that are not allowed in Vulkan.
See https://godbolt.org/z/E1484Pqan for an example. The SPV_KHR_no_integer_wrap_decoration extension is generated, but it is not legal.
```
RWBuffer<int> sb;
[numthreads(1,1,1)]
void main() {
sb[0] = -sb[1];
}
```
This needs to be fixed. I see two options based on whose responsibility it is to limit "all" extensions to just those allowed in Vulkan.
1. The SPIR-V backend will have two list for the SPIRVExtensionMap.
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