| Issue |
129106
|
| Summary |
[HLSL] Report error when only some elements in `cbuffer` have `packoffset` annotation
|
| Labels |
HLSL
|
| Assignees |
|
| Reporter |
hekota
|
DXC has been reporting a warning on the code below for a while. The layout it produces is inconsistent between DXIL and SPIRV. We should make this an error in Clang.
```
cbuffer CB {
float f;
float g : packoffset(c0.z);
}
```
`warning: cannot mix packoffset elements with nonpackoffset elements in a cbuffer`
DXC places the elements without `packoffset` after the elements with explicit layout:
```
; struct CB
; {
;
; float f; ; Offset: 12
; float g; ; Offset: 8
;
; } CB; ; Offset: 0 Size: 16
```
SPIR-V does it differently - the offset of the first element is 0:
```
OpMemberDecorate %type_CB 0 Offset 0
OpMemberDecorate %type_CB 1 Offset 8
```
https://godbolt.org/z/Wq7EhKxEE
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