Sylvain Pion wrote: > Andrew Thomas Pinski wrote: >>> The fact is that Roger's patch introduced a regression (this word >>> should be clear enough here), in that some users now have their old >>> code broken, and they are forced to add the -frounding-math option >>> (after having lost some time finding about this non trivial issue). >>> This is a long term hindrance. >> >> Actually before roger's patch the default is the same. Just there was >> no way to turn it off. > > Actually, there are 2 things controlled by -frounding-math : > 1) constant propagation of FP operations > 2) generic transformations like (-a)*b <-> -(a*b)
I think 2) is taken care of by -fassociative-math, or it should at least. Paolo
