tree e6f67c09eb18c394f17b91e74d2bd813fc7581a9
parent 1c981e6f81fc4d43487d6ad84d6b499fa55099e8
author Lynn Boger <laboger@linux.vnet.ibm.com> 1705701036 -0600
committer Lynn Boger <laboger@linux.vnet.ibm.com> 1708003821 +0000

x/crypto/internal/poly1305: improve sum_ppc64le.s

This contains a few minor improvements to sum_ppc64le.s
which result in up to 10% performance improvement for
some of the benchmarks in this directory.

- ADDZE followed by ADD can be combined into ADDE
- PCALIGN added to the loop
- Eliminate a few unnecessary register moves

goos: linux
goarch: ppc64le
pkg: golang.org/x/crypto/internal/poly1305
cpu: POWER10
                 │ poly.orig.out │              poly.out              │
                 │    sec/op     │   sec/op     vs base               │
64                   40.34n ± 0%   38.13n ± 0%   -5.47% (p=0.002 n=6)
1K                   482.2n ± 0%   444.6n ± 0%   -7.81% (p=0.002 n=6)
2M                   978.4µ ± 0%   879.3µ ± 0%  -10.12% (p=0.002 n=6)
64Unaligned          40.35n ± 0%   38.16n ± 0%   -5.42% (p=0.002 n=6)
1KUnaligned          482.0n ± 0%   444.2n ± 0%   -7.84% (p=0.002 n=6)
2MUnaligned          978.4µ ± 0%   879.4µ ± 0%  -10.12% (p=0.002 n=6)
Write64              32.69n ± 0%   30.71n ± 0%   -6.04% (p=0.002 n=6)
Write1K              472.4n ± 0%   436.5n ± 0%   -7.60% (p=0.002 n=6)
Write2M              978.3µ ± 0%   879.4µ ± 0%  -10.11% (p=0.002 n=6)
Write64Unaligned     32.67n ± 0%   30.71n ± 0%   -6.00% (p=0.002 n=6)
Write1KUnaligned     472.6n ± 0%   436.4n ± 0%   -7.66% (p=0.002 n=6)
Write2MUnaligned     978.5µ ± 0%   879.6µ ± 0%  -10.10% (p=0.002 n=6)
geomean              2.569µ        2.367µ        -7.87%

Change-Id: I63314e7252ef10fb2d157f623c4bc2e31a63ae32
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/558775
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Paul Murphy <murp@ibm.com>
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>