tree 92a855268b74fd32b43f4d0a119850f892a5dc9e
parent 0ec53bff19fd11df7b73a607c2fc3bc76ae844ad
author Gerda Zsejke More <gerdazsejke.more@arm.com> 1669217030 +0100
committer James Zern <jzern@google.com> 1669947804 +0000

Count down in Neon subpel variance loops

Counting down and terminating on a zero comparison allows us
to use flag-setting arithmetic instructions, avoiding
an additional CMP instruction before the conditional branch.
This doesn't really affect performance but code size is reduced
by a useful amount since loop prologues are also shorter.

Change-Id: I014288f6cbb8b5033c13fd62d6fb16dbc8a78c6e