Marcus Clyne <maccaday@xxxxxxxxx> writes: > Can anyone explain what GCC does differently for the two following > definitions: > > func1 (my_type_t * __restrict, my_type_t *__restrict); > > AND > > func2 (my_type_t *, my_type_t *); > > ? In the former cases, references through the pointers will be presumed to not alias. That is, memory reads and writes through those pointers may be reordered compared to how they appear in the program. This generally does not make too much difference on processors which execute instructions out-of-order, such as all modern Intel/AMD processors. Ian
