-fnon-call-exceptions + -fprofile-arcs on x86

[Eric Botcazou]

>   I don't see how, one of the two edges must be counted.  The exceptional
> edge cannot be, because there's no actual flow there.  So profile must
> add the incrementing code on the fall through edge.

That was my opinion too.

> I guess what needs to happen is that (when -fprofile-arcs is on) cc0 is
> clobbered at the end of every block.

RTH's fix aims to prevent the middle-end from generating compare insns that 
may trap if flag_non_call_exceptions is enabled.  I think that's the best we 
can do.

Thanks for your feedback.

-- 
Eric Botcazou