https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83304
--- Comment #5 from ktkachov at gcc dot gnu.org ---
(In reply to Segher Boessenkool from comment #4)
> With r255384 combine manages to do many more combinations. Without it, it
> can get rid of most of the loop body (which should have been optimised
> away in gimple already really).
>
> I don't see how it would abort, but I find that "it" stuff really hard
> to read, so I might be missing something.
Sorry, some commentary on the code from me would have been in order...
The "it" stuff can be ignored, it's just a way of prefixing a conditional
instruction. So
it eq
moveq r1, #0
is really just a moveq r1, #0 where moveq is a conditional 'mov' with 'eq' as
the condition code.
One of the conditional jumps to L22 would have to have been taken in order to
abort. I haven't looked at the compiler dumps yet to figure out what's going
on...
