quantize: use aarch64 vmaxv
Simplify max value calculation on aarch64 by using vmaxv. Much
faster for 4x4 but diminishing returns as the block size grows.
Only the vp9 quantize has a speed test hooked up. Anticipate
similar results for the other quantize versions.
Before:
[ RUN ] NEON/VP9QuantizeTest.DISABLED_Speed/2
[ BENCH ] Bypass calculations 4x4 31.6 ms ( ±0.0 ms )
[ BENCH ] Full calculations 4x4 31.6 ms ( ±0.0 ms )
[ BENCH ] Bypass calculations 8x8 17.7 ms ( ±0.0 ms )
[ BENCH ] Full calculations 8x8 17.7 ms ( ±0.0 ms )
[ BENCH ] Bypass calculations 16x16 14.2 ms ( ±0.0 ms )
[ BENCH ] Full calculations 16x16 14.2 ms ( ±0.0 ms )
[ OK ] NEON/VP9QuantizeTest.DISABLED_Speed/2 (1906 ms)
[ RUN ] NEON/VP9QuantizeTest.DISABLED_Speed/3
[ BENCH ] Bypass calculations 32x32 18.6 ms ( ±0.0 ms )
[ BENCH ] Full calculations 32x32 18.6 ms ( ±0.0 ms )
After:
[ RUN ] NEON/VP9QuantizeTest.DISABLED_Speed/2
[ BENCH ] Bypass calculations 4x4 29.1 ms ( ±0.0 ms )
[ BENCH ] Full calculations 4x4 29.1 ms ( ±0.0 ms )
[ BENCH ] Bypass calculations 8x8 16.9 ms ( ±0.0 ms )
[ BENCH ] Full calculations 8x8 16.9 ms ( ±0.0 ms )
[ BENCH ] Bypass calculations 16x16 14.1 ms ( ±0.0 ms )
[ BENCH ] Full calculations 16x16 14.1 ms ( ±0.0 ms )
[ OK ] NEON/VP9QuantizeTest.DISABLED_Speed/2 (1803 ms)
[ RUN ] NEON/VP9QuantizeTest.DISABLED_Speed/3
[ BENCH ] Bypass calculations 32x32 18.6 ms ( ±0.0 ms )
[ BENCH ] Full calculations 32x32 18.6 ms ( ±0.0 ms )
Change-Id: Ic95812b3fdbd4e47b4dcb8ed46c68a9617de38d2