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This is my old ARM9E/ARM11 memcpy code from
    https://garage.maemo.org/projects/mplayer/


with some tuning for Raspberry Pi (aligned prefetch added).

Will be used by VFP optimized overlapped blt function.
Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>

Should be useful for better performance when moving windows
and scrolling on the devices without a dedicated 2D hardware
accelerator (Allwinner A13).
Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>