------- Comment #19 from rakdver at atrey dot karlin dot mff dot cuni dot cz 2006-07-13 08:01 ------- Subject: Re: poor optimization choices when iterating over a std::string (probably not c++-specific)
> > > I-cache. > > this only matters if this increase in code size will make the code go > > out of instruction cache. > > The real program that this is taken from is a large C++ application > which is guaranteed to go out of cache - it's got slightly less than > four megabytes of .text - the actual goal is to make sure all of its > inner inner inner loops do stay in cache. And this is one of 'em. on your real program, how much performance do you gain by hand-rewriting the assembler to look the way you like? Just to make sure there really is a problem. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28364
