| Issue |
124928
|
| Summary |
[SPIR-V] Non-logical pointer generated following an ptrcast
|
| Labels |
SPIR-V
|
| Assignees |
Keenuts
|
| Reporter |
Keenuts
|
Logical SPIR-V is not allowing pointer cast after an `OpAccessChain`.
Given this LLVM IR:
```llvm
define internal spir_func void @baz(ptr addrspace(10) %a, i64 %b) {
%index = getelementptr <4 x i32>, ptr addrspace(10) %a, i64 %b
%load = load <3 x i32>, ptr addrspace(10) %index, align 4
ret void
}
```
In OpenCL SPIR-V, the following instructions would be generated:
```
%index_1 = OpAccessChain %_ptr_Private_v4uint %a_1
%28 = OpBitcast %_ptr_Private_v3uint %index_1
%loadv_1 = OpLoad %v3uint %28 Aligned 4
```
This is not allowed in logical SPIR-V.
For this specific case, what we'd need is to load the initial `<4 x i32>`, then `OpCompositeExtract` and then `OpCompositeConstruct`.
If the types were of the same bit-size, we could to the `OpBitcast`, but on the value after the load.
For other types of cast, we might have to handle this differently (loading the initial member of a struct for ex).
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