commit c1fe5663f5c386d03892c9d9b82cbb169ddea171
author George Steed <george.steed@arm.com> Thu Apr 18 08:58:29 2024 +0100
committer Frank Barchard <fbarchard@chromium.org> Wed Jul 10 23:12:43 2024 +0000
tree 02c5ea9fb8a597cef62c2705a8893bf247c170e9
parent 5bac99fe09055ff6866d052669c123d00a86fae0

[AArch64] Use full vectors in ARGB4444To{Y,UV}Row_NEON

The existing ARGB4444TORGB macro only makes use of 64 bit wide vectors
rather than the full 128 bits available, so unroll it to allow us to
process more data per instruction.

For ARGB4444ToUVRow_NEON we already have enough data available each
iteration to make use of full vectors, but for ARGB4444ToYRow_NEON we
also need to adjust the "any" kernel to allow us to process 16 elements
per iteration.

Reduction in runtimes observed compared to the existing Neon kernels:

            | ARGB4444ToUVRow | ARGB4444ToYRow
 Cortex-A55 |          -27.8% |         -34.6%
Cortex-A510 |          -37.0% |         -44.4%
 Cortex-A76 |          -40.2% |         -22.0%
Cortex-A720 |          -33.4% |         -35.5%
  Cortex-X1 |          -34.1% |         -19.7%
  Cortex-X2 |          -32.1% |         -26.3%

Bug: libyuv:976
Change-Id: I08f6286bab0ebf5e24d5d5803f8c45ec6ba776ee
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/5631541
Reviewed-by: Justin Green <greenjustin@google.com>
Reviewed-by: Frank Barchard <fbarchard@chromium.org>