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| author | Guoqi Chen <chenguoqi@loongson.cn> | 2024-09-20 11:06:18 +0800 |
|---|---|---|
| committer | abner chenc <chenguoqi@loongson.cn> | 2024-11-19 01:15:07 +0000 |
| commit | 5432cd96fd951bce01bbce9f9744b62871f79b17 (patch) | |
| tree | c39427705c0f47fd68575225c3509d4e9c9b824b /src/runtime | |
| parent | ec7824b6bb12481e7ffe50b7f1cbaa1faf465a44 (diff) | |
| download | go-5432cd96fd951bce01bbce9f9744b62871f79b17.tar.xz | |
cmd/compiler,internal/runtime/atomic: optimize Cas{64,32} on loong64
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>
Diffstat (limited to 'src/runtime')
| -rw-r--r-- | src/runtime/cpuflags.go | 1 | ||||
| -rw-r--r-- | src/runtime/proc.go | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/src/runtime/cpuflags.go b/src/runtime/cpuflags.go index 3f88d20fb3..e81e50f5df 100644 --- a/src/runtime/cpuflags.go +++ b/src/runtime/cpuflags.go @@ -34,6 +34,7 @@ var ( arm64HasATOMICS bool + loong64HasLAMCAS bool loong64HasLAM_BH bool loong64HasLSX bool ) diff --git a/src/runtime/proc.go b/src/runtime/proc.go index cbfac3a923..3f360ef129 100644 --- a/src/runtime/proc.go +++ b/src/runtime/proc.go @@ -752,6 +752,7 @@ func cpuinit(env string) { arm64HasATOMICS = cpu.ARM64.HasATOMICS case "loong64": + loong64HasLAMCAS = cpu.Loong64.HasLAMCAS loong64HasLAM_BH = cpu.Loong64.HasLAM_BH loong64HasLSX = cpu.Loong64.HasLSX } |