Tobias Ringström <tobias@xxxxxxxxx> writes:
> struct dev_t {
> volatile unsigned R0;
> volatile unsigned R1;
> };
> Note how the moveq/movne pairs always load the same value. If equal
> load 5120 else load 5120. Also note that it loads the addresses every
> iteration instead of just once before the (unrolled) loop.
>
> It's also pointlessly reloading the value of *d ("[r0]") to r3 every
> time, which is a regression from 4.4.3, and the root of my primary
> performance regression.
>
> Should I file zero, one or two bugs about this?
This is presumably happening because of the volatile declarations.
One bug report should suffice. Thanks.
Ian
