tree d3b99ae67e5504c0452681c85c32516afae0209d
parent 7ef83148cfbfd0163fa22a0550d128d935fe2bad
author Jonathan Wright <jonathan.wright@arm.com> 1620309065 +0100
committer James Zern <jzern@google.com> 1620413366 -0700

Optimize Neon SAD reductions using wider ADDP instruction

Implement AArch64-only paths for each of the Neon SAD reduction
functions, making use of a wider pairwise addition instruction only
available on AArch64.

This change removes the need for shuffling between high and low
halves of Neon vectors - resulting in a faster reduction that requires
fewer instructions.

Bug: b/181236880
Change-Id: I1c48580b4aec27222538eeab44e38ecc1f2009dc