3 commits

Author	SHA1	Message	Date
Jens Arnold	545b51e2e4	ARMv4 unsigned integer division: Using an overflow-safe comparison method in the main calculation allows to put back the 1.5 cyle (average) optimisation. Shaved off another instruction, as we don't need the remainder. * Use the very efficient ffs algorithm from ffs-arm.S for dividing by a power of 2. ... git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19032 a1c6a512-1295-4272-9138-f99709370657	2008-11-06 21:21:33 +00:00
Jens Arnold	0eb6ae938e	This optimisation breaks for very large divisors (MSB set), so remove it. ... git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19012 a1c6a512-1295-4272-9138-f99709370657	2008-11-05 07:36:39 +00:00
Jens Arnold	fe04e40be7	Further optimised (vs. libgcc) unsigned 32 bit division for ARMv4 (based on the ARMv5(+) version from libgcc), in IRAM on PP for better performance on PP5002, and put into the codeclib for possible reuse. APE -c1000 is now usable on both PP502x and PP5002 (~138% realtime, they're on par now). Gigabeat F/X should also see an APE speedup. ... git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19009 a1c6a512-1295-4272-9138-f99709370657	2008-11-05 00:10:05 +00:00