------- Comment #6 from rguenther at suse dot de 2009-05-29 20:15 ------- Subject: Re: [4.5 Regression] Big degradation on swim/mgrid on powerpc 32/64 after alias improvement merge (gcc r145494)
On Fri, 29 May 2009, luisgpm at linux dot vnet dot ibm dot com wrote: > ------- Comment #5 from luisgpm at linux dot vnet dot ibm dot com 2009-05-29 > 19:52 ------- > From predictive commoning we gain a bit more performance, probably due to the > bigger unrolling factor. > > Any chance of the unrolling taking place while still using PRE? -funroll[-all]-loops doesn't seem to do the job. I didn't check if enabling sms would do it. Other unrolling on the tree level is only implemented as side-effect of other optimizations (like vectorization or predictive commoning or prefetching) :/ Richard. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40029
