On Wed, Oct 03, 2012 at 01:54:23PM -0400, Rich Felker wrote: > On Sat, Sep 29, 2012 at 02:48:48AM +0200, Gabriel Gonzalez wrote: > > This version for ARM improves performance mainly unrolling the loop for > > iterations > > and reducing the instructions need to look for the null character. > > A deeper analysis of this can be found at > > http://www.gabrielgonzalezgarcia.com/2012/10/02/mystrlen-vs-android-bionics-strlen-on-arm-cpu/ > > > > where you can find some data which back up the performance improvement. > > I have only tested it on a little endian CPU so the BIG ENDIAN chunk might > > need some testing > > I suspect this code is still considerably slower than the good C > implementation, which looks something like:
Never mind, looks like you're using the good algorithm. And gcc does a rather bad job of optimizing it for ARM, so you should be able to beat it easily. Cheers. Rich _______________________________________________ uClibc mailing list [email protected] http://lists.busybox.net/mailman/listinfo/uclibc
