Hi,
I have a custom backend specific intrinsic with the signature {i32, i8*} {i8*, i32}.
The intrinsic is similar to a post increment load but does some thing extra.
It returns the value that is loaded from the memory and the updates the base pointer.
void foo (int *restrict ptr, int *output, int loaded_value, int N) {
// This updates loaded_value and updates the ptr to ptr+N
ptr = intrinsic_call( ptr,&loaded_value, N);
*output = N;
}
The ScheduleDAG creates an ordered memory dependency from the intrinsic_call to the unrelated store from “output”.
which is causing a performance degradation in my case. The value of “ptr” is updated through
“extractvalue” and that makes it harder for the AA to identify the underlying object and ends up with a “mayalias”.
I have tried playing around with attributes to the intrinsic call and none of them seem appropriate in my case.
Any pointers, ideas and suggestions would be most welcomed.
–Sumanth