thx I'll try that but wouldn't it make more sense to implement a hw version of this function?(do I need a different compiler?)
Almost all modules use this call and I guess it could really improve the performance. On Tue, Feb 24, 2015 at 12:27 PM, Vladimir 'phcoder' Serbinenko <phco...@gmail.com> wrote: > > > Le Tue Feb 24 2015 at 11:01:03 AM, Michael Zimmermann > <sigmaepsilo...@gmail.com> a écrit : >> >> the function seems to use __aeabi_uidiv. I'm not sure if this is a sw >> or hw implementation. > > software. Try attached patch >> >> Full code: >> ASM: http://pastebin.com/FnPRZt1H >> pseudo-C: http://pastebin.com/dH3YBk46 >> >> On Tue, Feb 24, 2015 at 10:51 AM, Vladimir 'phcoder' Serbinenko >> <phco...@gmail.com> wrote: >> > Did you try to look at ASM of the function in question? Do you compile >> > to >> > thumb? Multiplication sometimes generates function calls in thumb. Try >> > marking the scaling function as arm explicitly >> > >> > Le 2015-02-24 10:39, "Michael Zimmermann" <sigmaepsilo...@gmail.com> a >> > écrit >> > : >> >> >> >> Any ideas what could slow down the image scaling algorithm? >> >> The only reasons I could think of would either be slow memory or some >> >> compiler problems. Since my Ram is mapped cachable I don't think the >> >> RAM is too slow. >> >> >> >> I even forces using the Nearest neighbor algorithm already. It speeds >> >> things up a lot but it's not as fast as you'd expect. >> >> >> >> Some technical info: >> >> ARMv7 >> >> Linaro GCC 4.9 >> >> MMU setup is done by the previous bootloader(I disabled GRUB's (uboot) >> >> MMU setup - it prooved to be faster) >> >> >> >> _______________________________________________ >> >> Grub-devel mailing list >> >> Grub-devel@gnu.org >> >> https://lists.gnu.org/mailman/listinfo/grub-devel >> > >> > >> > _______________________________________________ >> > Grub-devel mailing list >> > Grub-devel@gnu.org >> > https://lists.gnu.org/mailman/listinfo/grub-devel >> > >> >> _______________________________________________ >> Grub-devel mailing list >> Grub-devel@gnu.org >> https://lists.gnu.org/mailman/listinfo/grub-devel > > > _______________________________________________ > Grub-devel mailing list > Grub-devel@gnu.org > https://lists.gnu.org/mailman/listinfo/grub-devel > _______________________________________________ Grub-devel mailing list Grub-devel@gnu.org https://lists.gnu.org/mailman/listinfo/grub-devel
