Richard Guenter wrote: > On Thu, Mar 8, 2012 at 3:29 PM, Ulrich Weigand <uweig...@de.ibm.com> wrote: > > I'm wondering where to go from there: > > > > - Why are those special re-association cases handled only in forwprop, > > and not in fold-cost? I would have expected forwprop to just propagate > > subexpressions into a tree and then use fold-const to actually simplify ... > > We are moving away from GENERIC expression simplification towards > simplifications/combines on GIMPLE SSA (Andrew Pinski is working > on this a lot on his branch at the moment).
OK, I see. > > - Should I try to improve forwprop to handle casts and additional re- > > association cases until it handles the above expression? > > Yes, ideally by trying to sub-divide this task into separate profitable > transforms. Maybe Andrew can chime in here? Thanks, I'll try to have a look into this direction ... Bye, Ulrich -- Dr. Ulrich Weigand GNU Toolchain for Linux on System z and Cell BE ulrich.weig...@de.ibm.com
