Q420 optimize for NEON

[Google Code Exporter]

Q420 uses custom SSE2.
Now that YUY2 has 422 row functions, use them, reduce code, improve 
performance, and gain NEON version.

Original issue reported on code.google.com by [e-mail] on 21 Sep 2012 at 5:17

[Google Code Exporter]

fixed in r386

Original comment by [e-mail] on 1 Oct 2012 at 5:46

• Changed state: Fixed

[Google Code Exporter]

r386 works for Neon but has alignment bug for SSE2 on odd image sizes.

Original comment by [e-mail] on 1 Oct 2012 at 6:38

• Changed state: Started

[Google Code Exporter]

r387 fixes alignment

Original comment by [e-mail] on 1 Oct 2012 at 8:17

• Changed state: Fixed