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Guoqi Chen 3214129a83 cmd/compiler,internal/runtime/atomic: optimize Load{64,32,8} on loong64 
The LoadAcquire barrier on Loong64 is "dbar 0x14", using the correct
barrier in Load{8,32,64} implementation can improve performance.

goos: linux
goarch: loong64
pkg: internal/runtime/atomic
cpu: Loongson-3A6000-HV @ 2500.00MHz
                |  bench.old   | bench.new                           |
                |  sec/op      |  sec/op        vs base              |
AtomicLoad64      17.210n ± 0%   4.402n ± 0%   -74.42% (p=0.000 n=20)
AtomicLoad64-2    17.210n ± 0%   4.402n ± 0%   -74.42% (p=0.000 n=20)
AtomicLoad64-4    17.210n ± 0%   4.402n ± 0%   -74.42% (p=0.000 n=20)
AtomicLoad        17.220n ± 0%   4.402n ± 0%   -74.44% (p=0.000 n=20)
AtomicLoad-2      17.210n ± 0%   4.402n ± 0%   -74.42% (p=0.000 n=20)
AtomicLoad-4      17.210n ± 0%   4.402n ± 0%   -74.42% (p=0.000 n=20)
AtomicLoad8       17.210n ± 0%   4.402n ± 0%   -74.42% (p=0.000 n=20)
AtomicLoad8-2     17.210n ± 0%   4.402n ± 0%   -74.42% (p=0.000 n=20)
AtomicLoad8-4     17.210n ± 0%   4.402n ± 0%   -74.42% (p=0.000 n=20)
geomean           17.21n         4.402n        -74.42%

goos: linux
goarch: loong64
pkg: internal/runtime/atomic
cpu: Loongson-3A5000 @ 2500.00MHz
                |  bench.old   | bench.new                           |
                |  sec/op      |  sec/op        vs base              |
AtomicLoad64      18.82n ± 0%    10.41n ± 0%   -44.69% (p=0.000 n=20)
AtomicLoad64-2    18.81n ± 0%    10.41n ± 0%   -44.66% (p=0.000 n=20)
AtomicLoad64-4    18.82n ± 0%    10.41n ± 0%   -44.69% (p=0.000 n=20)
AtomicLoad        18.81n ± 0%    10.41n ± 0%   -44.66% (p=0.000 n=20)
AtomicLoad-2      18.82n ± 0%    10.41n ± 0%   -44.69% (p=0.000 n=20)
AtomicLoad-4      18.81n ± 0%    10.42n ± 0%   -44.63% (p=0.000 n=20)
AtomicLoad8       18.82n ± 0%    10.41n ± 0%   -44.69% (p=0.000 n=20)
AtomicLoad8-2     18.82n ± 0%    10.41n ± 0%   -44.70% (p=0.000 n=20)
AtomicLoad8-4     18.82n ± 0%    10.41n ± 0%   -44.69% (p=0.000 n=20)
geomean           18.82n         10.41n        -44.68%

Change-Id: I9d47c9d6f359c4f2e41035ca656429aade2e7847
Reviewed-on: https://go-review.googlesource.com/c/go/+/581357
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
 		2024-08-01 02:17:13 +00:00
..
atomic cmd/compiler,internal/runtime/atomic: optimize Load{64,32,8} on loong64 2024-08-01 02:17:13 +00:00
exithook internal/runtime/exithook: make safe for concurrent os.Exit 2024-05-24 16:41:13 +00:00
math runtime,internal: move runtime/internal/math to internal/runtime/math 2024-07-23 19:05:16 +00:00
sys runtime,internal: move runtime/internal/sys to internal/runtime/sys 2024-07-23 19:05:35 +00:00
syscall all: delete loong64 non-register ABI fallback path 2024-05-13 15:04:25 +00:00