the function seems to use __aeabi_uidiv. I'm not sure if this is a sw or hw implementation. 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
