Re: GUB and mpfr/mpc

[Keith OHara]

Dan Eble <dan <at> faithful.be> writes:

> > On Dec 8, 2014, at 08:21 , David Kastrup <dak <at> gnu.org> wrote:
> > 
> > Masamichi HOSODA <trueroad <at> sea.plala.or.jp> writes:
> > 
> >>> I agree that changing the algorithms is preferred; I didn’t mean to
> >> suggest otherwise.  But if that’s not going to happen overnight, and
> >> there is a way to mitigate the problem in the meantime without
> >> touching the code, the people affected would value it.
> >> 
> >> I tried "-mfpmath=sse -msse2".
> >> It worked fine. bad_alloc didn't occur.
> >> Correct PDF was generated.
> >> 
> >> It can be a workaround until changing the algorithms.
> > 
> > It's not architecture independent.  And may blow up for other reasons.
> 
> But it’s good to know that the problem was floating point and not memory 
corruption, so thanks for testing it.
> 

This sounds like the runaway-loop problem we noticed when allowing
zero-width items into skylines.   I opened issue 4229 and will post
a patch.