On Fri, Jan 12, 2007 at 02:06:48PM -0500, Daniel Berlin wrote: > On 1/12/07, H. J. Lu <[EMAIL PROTECTED]> wrote: > >On Thu, Jan 11, 2007 at 08:06:31PM -0500, Daniel Berlin wrote: > >> On 1/11/07, Grigory Zagorodnev <[EMAIL PROTECTED]> > >wrote: > >> >Menezes, Evandro wrote: > >> >> Though not as pronounced, definitely significant. > >> >> > >> > > >> >Using binary search I've detected that 30% performance regression of > >> >cpu2006/437.leslie3d benchmark is caused by revision 117891. > >> > > >> >http://gcc.gnu.org/viewcvs?view=rev&revision=117891 > >> > > >> >I assume same commit causes regression of all other benchmarks from > >> >cpu2k6 suite (running others to confirm). > >> > >> This only affects 4.2, and the only solution would be to try to > >> backport some of the 4.3 aliasing stuff to 4.2, which i'm not sure is > >> a great idea. > >> > > > >If this serious performance in gcc 4.2 isn't addressed, it may > >make gcc 4.2 less attractive since it may generate much slower > >executables. > > I'm happy to backport it, but it's going to introduce other possible > problems in 4.2. >
It isn't my call. Mark, can you comment on this? Thanks. H.J.
