------- Comment #14 from zadeck at naturalbridge dot com 2007-04-03 16:47 ------- Subject: Re: [4.3] inf loop/long compile time, time spent in var-tracking.c
steven at gcc dot gnu dot org wrote: > ------- Comment #13 from steven at gcc dot gnu dot org 2007-04-03 16:40 > ------- > So this may be a non-monotonous dataflow problem...? > > Do we have the dataflow equations of the var-tracking problem somewhere? It'd > be interesting to check them against the actual implementation. > > > this is a pretty complex problem. I gave it a cursory once over and it looks like the problem may not terminate if the location (stack offset) of a variable is not the same on all paths into a block. (the code may be different than the comments and i did just scan this) I assume that this case has a "bug" where a variable appears to be at a different location coming across an exception edge. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31412
