* unrelated question: has anyone ever passed a pointer/reference to a variable to an asm block only to have the compiler optimize away that same variable?

in this case, the value passed into write was a reference to some data inside of an option.

```
core::arch::asm!("
mov r12,{read}
movs r3,{write}
svc #114
", read=in(reg) &raw mut read, write=in(reg) write, clobber_abi("C"));
```