| Issue |
168755
|
| Summary |
[Matrix] [HLSL] add a ICK_HLSL_Matrix_Truncation to handle matrix truncations in HLSL
|
| Labels |
clang:frontend,
HLSL
|
| Assignees |
farzonl
|
| Reporter |
farzonl
|
> These are the truncation tests we should support:
> https://godbolt.org/z/73vj6jMs7
>
> essentially if the src is bigger than the dest even if destination is a scalar we should truncate. this should be handled via a new `ICK_HLSL_Matrix_Truncation`. tha should behave similarly to `ICK_HLSL_Vector_Truncation` since they share the same spec.
>
> ```hlsl
> export int3x3 trunc_cast(int4x4 i44) {
> int3x3 i33 = (int3x3)i44;
> return i33;
> }
>
> export int3x2 trunc_cast2(int4x4 i44) {
> int3x2 i32 = (int3x2)i44;
> return i32;
> }
>
> export int2x3 trunc_cast3(int4x4 i44) {
> int2x3 i23 = (int2x3)i44;
> return i23;
> }
>
> export int2x2 trunc_cast4(int4x4 i44) {
> int2x2 i22 = (int2x2)i44;
> return i22;
> }
>
> export int2x1 trunc_cast5(int4x4 i44) {
> int2x1 i21 = (int2x1)i44;
> return i21;
> }
>
> export int trunc_cast6(int4x4 i44) {
> int i21 = (int)i44;
> return i21;
> }
> ```
_Originally posted by @farzonl in [#162711](https://github.com/llvm/llvm-project/issues/162711#issuecomment-3554166872)_
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