> What is the meaning of use(*p) in case p is null? It dereferences a null pointer, invoking undefined behaviour, then calls the function `use` with the result

> What is the meaning of use(*p) in case p is null? It dereferences a null pointer, invoking undefined behaviour, then calls the function `use` with the resulting value. > what should the compiler emit? Probably something to the effect of: ld r0 [sp+.p] # if p is not already in a register ld r0 [r0] # *p jsr use but it would be fine to emit something like: ld r0 [sp+.p] # if p is not already in a register jz r0 .panic ld r0 [r0] # *p jsr use because the jz can only be taken when undefined behaviour happens.