Some more results:

= Raspberry Pi 3B 1GB =

   length | before (MiB/s) |  after (MiB/s) |    delta
----------|----------------|----------------|----------
    32768 |          48.24 |          46.19 |   -4.26%
    65536 |          85.99 |          79.96 |   -7.02%
   131072 |         154.00 |         139.68 |   -9.30%
   262144 |         178.72 |         164.12 |   -8.17%
   524288 |         163.56 |         156.55 |   -4.28%
  1048576 |         246.15 |         234.32 |   -4.81%

= Raspberry Pi 3A+ 512MB =

   length | before (MiB/s) |  after (MiB/s) |    delta
----------|----------------|----------------|----------
    32768 |          57.11 |          54.22 |   -5.06%
    65536 |         101.16 |          94.53 |   -6.56%
   131072 |         186.94 |         168.37 |   -9.94%
   262144 |         200.16 |         181.37 |   -9.39%
   524288 |         175.91 |         168.93 |   -3.97%
  1048576 |         261.19 |         250.62 |   -4.04%

= Raspberry Pi Zero 2 =

   length | before (MiB/s) |  after (MiB/s) |    delta
----------|----------------|----------------|----------
    32768 |          40.58 |          38.75 |   -4.51%
    65536 |          72.51 |          67.57 |   -6.81%
   131072 |         132.02 |         121.20 |   -8.20%
   262144 |         165.26 |         149.13 |   -9.76%
   524288 |         160.46 |         153.15 |   -4.55%
  1048576 |         241.92 |         230.87 |   -4.57%

Worth noting that the Pi 4 uses the 2711 SoC, while these (the 3B, 3A+,
and Zero 2) all use the older 2837 SoC. In other words, while the new
memcpy seems "okay" on the 2711, it's got "some" performance regression
on the 2837.

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https://bugs.launchpad.net/bugs/1951032

Title:
  AArch64: Backport memcpy improvements

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