commit a425b559bdf8c2a7c3567af42ffe970d238cb72e
author George Steed <george.steed@arm.com> Wed Apr 17 11:27:48 2024 +0100
committer Frank Barchard <fbarchard@chromium.org> Wed Jul 10 23:09:53 2024 +0000
tree 3613d8b5c315791ff203e58b92b6b7a26624ae2f
parent 3b3c7f0b81102c12a3642e1ca9031eccd0cbbcbd

[AArch64] Use full vectors in ARGB1555To{Y,UV}Row_NEON

The existing RGB555TOARGB 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 ARGB1555ToUVRow_NEON we already have enough data available each
iteration to make use of full vectors, but for ARGB1555ToYRow_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:

            | ARGB1555ToUVRow | ARGB1555ToYRow
 Cortex-A55 |          -28.8% |         -35.3%
Cortex-A510 |          -34.0% |         -48.5%
 Cortex-A76 |          -36.7% |         -25.1%
Cortex-A720 |          -29.7% |         -31.1%
  Cortex-X1 |          -31.6% |         -19.7%
  Cortex-X2 |          -27.6% |         -22.7%

Bug: libyuv:976
Change-Id: Idd745c133b5fb65001652a59f01ac1aa3bb42067
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/5631540
Reviewed-by: Frank Barchard <fbarchard@chromium.org>
Reviewed-by: Justin Green <greenjustin@google.com>