| Issue |
179716
|
| Summary |
[HLSL] Miscompile for cbuffers with structs containing only scalars after arrays.
|
| Labels |
HLSL
|
| Assignees |
bogner
|
| Reporter |
bogner
|
We currently have a fairly embarrassing miscompile for cbuffers with a scalar after an array. Consider:
Consider:
```hlsl
struct X {
int a1;
};
struct Q {
int xs[2];
X y;
};
cbuffer cbq {
Q qs[2];
};
RWStructuredBuffer<int> Out : register(u1);
[numthreads(1,1,1)]
void main() {
Out[0] = qs[0].y.a1;
}
```
Clang is generating a load with a row index of 1:
```hlsl
%.load1 = call %dx.types.CBufRet.i32 @dx.op.cbufferLoadLegacy.i32(i32 59, %dx.types.Handle %0, i32 1) #1, !dbg !107
```
But this should be row 2, as the struct starts on its own row.
Godbolt: https://hlsl.godbolt.org/z/169baTz7r
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