ed977e2f47
Go's memory model closely follows the approach C++ concurrency memory
model (https://go.dev/ref/mem) and Go atomic "has the same semantics as C++'s
sequentially consistent atomics".
Meanwhile according to RISCV manual A.6 "Mappings from C/C++ primitives to RISC-V primitives".
C/C++ atomic operations (memory_order_acq_rel) should be map to "amo<op>.{w|d}.aqrl"
LR/SC (memory_order_acq_rel) should map to "lr.{w|d}.aq; <op>; sc.{w|d}.rl"
goos: linux
goarch: riscv64
pkg: runtime/internal/atomic
│ atomic.old.bench │ atomic.new.bench │
│ sec/op │ sec/op vs base │
AtomicLoad64-4 4.216n ± 1% 4.202n ± 0% ~ (p=0.127 n=10)
AtomicStore64-4 5.040n ± 0% 6.718n ± 0% +33.30% (p=0.000 n=10)
AtomicLoad-4 4.217n ± 0% 4.213n ± 0% ~ (p=0.145 n=10)
AtomicStore-4 5.040n ± 0% 6.718n ± 0% +33.30% (p=0.000 n=10)
And8-4 9.237n ± 0% 9.240n ± 0% ~ (p=0.582 n=10)
And-4 5.878n ± 0% 6.719n ± 0% +14.31% (p=0.000 n=10)
And8Parallel-4 28.44n ± 0% 28.46n ± 0% +0.07% (p=0.000 n=10)
AndParallel-4 28.40n ± 0% 28.43n ± 0% +0.11% (p=0.000 n=10)
Or8-4 8.399n ± 0% 8.398n ± 0% ~ (p=0.357 n=10)
Or-4 5.879n ± 0% 6.718n ± 0% +14.27% (p=0.000 n=10)
Or8Parallel-4 28.43n ± 0% 28.45n ± 0% +0.09% (p=0.000 n=10)
OrParallel-4 28.40n ± 0% 28.43n ± 0% +0.11% (p=0.000 n=10)
Xadd-4 30.05n ± 0% 30.10n ± 0% +0.18% (p=0.000 n=10)
Xadd64-4 30.05n ± 0% 30.09n ± 0% +0.12% (p=0.000 n=10)
Cas-4 60.48n ± 0% 61.13n ± 0% +1.08% (p=0.000 n=10)
Cas64-4 62.28n ± 0% 62.34n ± 0% ~ (p=0.810 n=10)
Xchg-4 30.05n ± 0% 30.09n ± 0% +0.15% (p=0.000 n=10)
Xchg64-4 30.05n ± 0% 30.09n ± 0% +0.13% (p=0.000 n=10)
geomean 15.42n 16.17n +4.89%
Fixes #61295
Change-Id: I97b5325db50467eeec36fb079bded7b09a32330f
Reviewed-on: https://go-review.googlesource.com/c/go/+/508715
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Joel Sing <joel@sing.id.au>
Run-TryBot: M Zhuo <mzh@golangcn.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
(cherry picked from commit
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| doc | ||
| lib/time | ||
| misc | ||
| src | ||
| test | ||
| .gitattributes | ||
| .gitignore | ||
| CONTRIBUTING.md | ||
| LICENSE | ||
| PATENTS | ||
| README.md | ||
| SECURITY.md | ||
| VERSION | ||
| codereview.cfg | ||
| go.env | ||
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