5432cd96fd
In Loongson's new microstructure LA664 (Loongson-3A6000) and later, the atomic
compare-and-exchange instruction AMCAS[DB]{B,W,H,V} [1] is supported. Therefore,
the implementation of the atomic operation compare-and-swap can be selected according
to the CPUCFG flag LAMCAS: AMCASDB(full barrier) instruction is used on new
microstructures, and traditional LL-SC is used on LA464 (Loongson-3A5000) and older
microstructures. This can significantly improve the performance of Go programs on
new microstructures.
goos: linux
goarch: loong64
pkg: internal/runtime/atomic
cpu: Loongson-3A6000 @ 2500.00MHz
| bench.old | bench.new |
| sec/op | sec/op vs base |
Cas 46.84n ± 0% 22.82n ± 0% -51.28% (p=0.000 n=20)
Cas-2 47.58n ± 0% 29.57n ± 0% -37.85% (p=0.000 n=20)
Cas-4 43.27n ± 20% 25.31n ± 13% -41.50% (p=0.000 n=20)
Cas64 46.85n ± 0% 22.82n ± 0% -51.29% (p=0.000 n=20)
Cas64-2 47.43n ± 0% 29.53n ± 0% -37.74% (p=0.002 n=20)
Cas64-4 43.18n ± 0% 25.28n ± 2% -41.46% (p=0.000 n=20)
geomean 45.82n 25.74n -43.82%
goos: linux
goarch: loong64
pkg: internal/runtime/atomic
cpu: Loongson-3A5000 @ 2500.00MHz
| bench.old | bench.new |
| sec/op | sec/op vs base |
Cas 50.05n ± 0% 51.26n ± 0% +2.42% (p=0.000 n=20)
Cas-2 52.80n ± 0% 53.11n ± 0% +0.59% (p=0.000 n=20)
Cas-4 55.97n ± 0% 57.31n ± 0% +2.39% (p=0.000 n=20)
Cas64 50.05n ± 0% 51.26n ± 0% +2.42% (p=0.000 n=20)
Cas64-2 52.68n ± 0% 53.11n ± 0% +0.82% (p=0.000 n=20)
Cas64-4 55.96n ± 0% 57.26n ± 0% +2.33% (p=0.000 n=20)
geomean 52.86n 53.83n +1.82%
[1]: https://loongson.github.io/LoongArch-Documentation/LoongArch-ELF-ABI-EN.html
Change-Id: I9b777c63c124fb492f61c903f77061fa2b4e5322
Reviewed-on: https://go-review.googlesource.com/c/go/+/613396
Reviewed-by: Meidan Li <limeidan@loongson.cn>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Qiqi Huang <huangqiqi@loongson.cn>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
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| .github | ||
| api | ||
| doc | ||
| lib | ||
| misc | ||
| src | ||
| test | ||
| .gitattributes | ||
| .gitignore | ||
| CONTRIBUTING.md | ||
| LICENSE | ||
| PATENTS | ||
| README.md | ||
| SECURITY.md | ||
| codereview.cfg | ||
| go.env | ||
README.md
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