------- Comment #29 from rakdver at atrey dot karlin dot mff dot cuni dot cz 2006-11-09 19:41 ------- Subject: Re: [4.3 Regression] Misscompilation of spec2006 gcc
> > I would very much like to see it compared with mem-ssa before mem-ssa > > branch is merged. > > > Notice that the two approaches do not negate each other. Dan's proposal is a > smarter partitioning than what the current alias grouping mechanism tries to > do. We can actually have memory SSA on top of Dan's partitioning scheme. > Memory SSA will use that partitioning scheme when placing memory PHI nodes. > > The two approaches are orthogonal. Memory SSA simply adds a new degree of > factoring that gives you sparser UD chains. It also gives you exactly one > name > per store, without reducing precision. nevertheless, it is not obvious to me whether using mem-ssa over Daniel's proposal would bring any significant gains, which I would like to have verified before we introduce milion new bugs with mem-ssa (nothing personal, it simply is too large and too intrusive change not to bring any). -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29680
