================
@@ -4763,6 +4763,20 @@ Sema::PerformImplicitConversion(Expr *From, QualType
ToType,
CK_ZeroToOCLOpaqueType,
From->getValueKind()).get();
break;
+ case ICK_HLSL_Vector_Truncation: {
+ // Note: HLSL vectors are ExtVectors. Since this truncates a vector to a
+ // smaller vector, this can only operate on arguments where the source and
+ // destination types are ExtVectors.
----------------
llvm-beanz wrote:
HLSL's vector syntax produces ExtVectors. The `vector` type is basically:
```c++
template<typename T, int Sz>
using vector = T __attribute__((ext_vector_type(Sz)));
```
Then all the explicit types are just typedefs off that defined in
`hlsl_basic_types.h`.
We haven't explicitly disabled non-Ext vector types in Clang, but they are
disabled in DXC. I'm unsure one way or another whether we should explicitly
disable them in Clang for HLSL.
https://github.com/llvm/llvm-project/pull/71098
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