On Fri, 10 Nov 2023, Richard Biener wrote:
> > I'm afraid ignoring debug-only BBs goes contrary to overall var-tracking > > design: > > DEBUG_INSNs participate in dependency graph so that schedulers can remove or > > mutate them as needed when moving real insns across them. > > Note that debug-only BBs do not exist - the BB would be there even without > debug > insns! Yep, sorry, I misspoke when I earlier said >> and cause divergence when passing through a debug-only BB which would not be >> present at all without -g. They are present in the region, but skipped via no_real_insns_p. > So instead you have to handle BBs with just debug insns the same you > handle a completely empty BB. Yeah. There would be no problem if the scheduler never used no_real_insns_p and handled empty and non-empty BBs the same way. Alexander
