[llvm-dev] Using store with operands in non-zero address space

[Savonichev, Andrew via llvm-dev]

Gleb Popov via llvm-dev writes:
> I have the following IR:

>   %x = alloca i32, align 4
>   %p = alloca i32*, align 8
>   store i32* %x, i32** %p, align 8
>
> Now I change module's data layout and run InferAddressSpacePass. This turns that piece of code into
>
>   %x = alloca i32, align 4, addrspace(1)
>   %p = alloca i32*, align 8, addrspace(1)
>   store i32 addrspace(1)* %x, i32* addrspace(1)* %p, align 8
>
> But Verifier complains that the module is invalid, saying
>
> error: stored value and pointer type do not match
> store i32 addrspace(1)* %x3, i32* addrspace(1)* %p4, align 8
>
> I didn't even manage to write correct IR manually in presence of addrspace().
> Is it a bug, or I'm missing something?

`i32* addrspace(1)*' is a pointer in addrspace(1) that points to a pointer in
addrspace(0) (zero address space is not printed). In other words, pointee type
of `p' is `i32*', while you're trying to store `i32 addrspace(1)*'. You have to
change the alloca to make it work:

    %p = alloca i32 addrspace(1)*, align 8, addrspace(1)
    store i32 addrspace(1)* %x, i32 addrspace(1)* addrspace(1)* %p, align 8

--
Andrew