zygoloid wrote:
> For unions, clang will use the type of the union member with the largest size
> as the alloca type, regardless of which union member is active. I haven't
> tried, but your patch will probably compute the subobject size based on that
> arbitrarily picked member, rather than the one being accessed.
Another concrete case where using the IR type won't work is arrays whose
initializer is mostly-zeroes. For example, for
```
int arr[20] = {[5] = 6};
```
we give `arr` the IR type `<{ i32, i32, i32, i32, i32, i32, [14 x i32] }>` so
that we can use a `zeroinitializer` to fill the trailing portion of the array.
https://github.com/llvm/llvm-project/pull/78526
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