2013/3/4 Georg-Johann Lay <a...@gjlay.de>: > This patch fixed the speed of 64-bit shifts and rotate. > > These operations were implemented by bit-wise shifts and thus the speed is not > reasonable for such basic arithmetic. > > The new implementation first shifts byte-wise and only the remaining mod 8 is > shifted bit-wise. > > The new methods needs few more instructions, but 64-bit arithmetic needs much > code, anyway... But base arithmetic should operate reasonably fast and not > take 600 or mote ticks for a simple shift. > > Ok for trunk? > > Johann > > > * config/avr/lib1funcs.S (__ashrdi3, __lshrdi3, __ashldi3) > (__rotldi3): Shift bytewise if applicable. >
Approved. Denis.
