One can avoid one scratch register in MEDIAN_ABS_ACC
(by clobbering topleft which isn't needed lateron).
Furthermore, the earlier code requested more registers
in cglobal than it actually used: median_sad8 only needs
seven registers, median_sad16 only 11. One of these
registers is actually unclobbered (read-only), so
median_sad8 does not need to save and restore and
non-volatile registers on Win64.
Furthermore, the restriction of median_sad8 to x64 can now
be lifted.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Andreas Rheinhardt
67dfae9c5f