https://gcc.gnu.org/bugzilla/show_bug.cgi?id=39326
--- Comment #57 from rguenther at suse dot de <rguenther at suse dot de> --- On Wed, 17 Feb 2016, sergstesh at yahoo dot com wrote: > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=39326 > > --- Comment #56 from Sergei Steshenko <sergstesh at yahoo dot com> --- > "-O2 ... and 820MB peak memory use" vs "-O3 ... and 700MB peak memory use" - > according to my common sense -O3 is stronger than -02 optimization, and one > should expect greater memory use. > > So, can the above be an indication of yet another bug ? I.e. -O3 in reality > does not do something it is supposed to do while -O2 does this ? More like -O3 cleans up the code due to stronger optimization before the memory-hogging part comes in and thus that one needs less memory do to its work.
