tree 69c1e0a9802c17b825e83a3db2918fcd85437ad7
parent 9ad901b35d392ea02b95e2dc95086f03bb452033
author Gerda Zsejke More <gerdazsejke.more@arm.com> 1669297662 +0100
committer James Zern <jzern@google.com> 1671134528 +0000

Count down in Neon 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 -
especially with older compilers.

Change-Id: I3f75319654c13006591ce861f5a0c2d3230a5e32