mirror of https://github.com/golang/go.git
[release-branch.go1.19] cmd/asm, cmd/internal/obj: generate proper atomic ops for riscv64
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 #61470
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 890b96f7ab)
Reviewed-on: https://go-review.googlesource.com/c/go/+/511495
Reviewed-by: M Zhuo <mzh@golangcn.org>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Bypass: Matthew Dempsky <mdempsky@google.com>
Auto-Submit: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This commit is contained in:
Meng Zhuo
Gopher Robot
parent
8c8277b8a1
commit
f9c174f502
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@ -183,28 +183,28 @@ start:
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// 8.2: Load-Reserved/Store-Conditional
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LRW (X5), X6 // 2fa30214
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LRD (X5), X6 // 2fb30214
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SCW X5, (X6), X7 // af23531c
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SCD X5, (X6), X7 // af33531c
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SCW X5, (X6), X7 // af23531a
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SCD X5, (X6), X7 // af33531a
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// 8.3: Atomic Memory Operations
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AMOSWAPW X5, (X6), X7 // af23530c
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AMOSWAPD X5, (X6), X7 // af33530c
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AMOADDW X5, (X6), X7 // af235304
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AMOADDD X5, (X6), X7 // af335304
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AMOANDW X5, (X6), X7 // af235364
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AMOANDD X5, (X6), X7 // af335364
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AMOORW X5, (X6), X7 // af235344
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AMOORD X5, (X6), X7 // af335344
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AMOXORW X5, (X6), X7 // af235324
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AMOXORD X5, (X6), X7 // af335324
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AMOMAXW X5, (X6), X7 // af2353a4
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AMOMAXD X5, (X6), X7 // af3353a4
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AMOMAXUW X5, (X6), X7 // af2353e4
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AMOMAXUD X5, (X6), X7 // af3353e4
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AMOMINW X5, (X6), X7 // af235384
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AMOMIND X5, (X6), X7 // af335384
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AMOMINUW X5, (X6), X7 // af2353c4
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AMOMINUD X5, (X6), X7 // af3353c4
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AMOSWAPW X5, (X6), X7 // af23530e
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AMOSWAPD X5, (X6), X7 // af33530e
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AMOADDW X5, (X6), X7 // af235306
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AMOADDD X5, (X6), X7 // af335306
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AMOANDW X5, (X6), X7 // af235366
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AMOANDD X5, (X6), X7 // af335366
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AMOORW X5, (X6), X7 // af235346
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AMOORD X5, (X6), X7 // af335346
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AMOXORW X5, (X6), X7 // af235326
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AMOXORD X5, (X6), X7 // af335326
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AMOMAXW X5, (X6), X7 // af2353a6
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AMOMAXD X5, (X6), X7 // af3353a6
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AMOMAXUW X5, (X6), X7 // af2353e6
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AMOMAXUD X5, (X6), X7 // af3353e6
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AMOMINW X5, (X6), X7 // af235386
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AMOMIND X5, (X6), X7 // af335386
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AMOMINUW X5, (X6), X7 // af2353c6
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AMOMINUD X5, (X6), X7 // af3353c6
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// 10.1: Base Counters and Timers
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RDCYCLE X5 // f32200c0
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@ -2036,17 +2036,22 @@ func instructionsForProg(p *obj.Prog) []*instruction {
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return instructionsForStore(p, ins.as, p.To.Reg)
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case ALRW, ALRD:
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// Set aq to use acquire access ordering, which matches Go's memory requirements.
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// Set aq to use acquire access ordering
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ins.funct7 = 2
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ins.rs1, ins.rs2 = uint32(p.From.Reg), REG_ZERO
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case AADDI, AANDI, AORI, AXORI:
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inss = instructionsForOpImmediate(p, ins.as, p.Reg)
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case ASCW, ASCD, AAMOSWAPW, AAMOSWAPD, AAMOADDW, AAMOADDD, AAMOANDW, AAMOANDD, AAMOORW, AAMOORD,
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case ASCW, ASCD:
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// Set release access ordering
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ins.funct7 = 1
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ins.rd, ins.rs1, ins.rs2 = uint32(p.RegTo2), uint32(p.To.Reg), uint32(p.From.Reg)
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case AAMOSWAPW, AAMOSWAPD, AAMOADDW, AAMOADDD, AAMOANDW, AAMOANDD, AAMOORW, AAMOORD,
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AAMOXORW, AAMOXORD, AAMOMINW, AAMOMIND, AAMOMINUW, AAMOMINUD, AAMOMAXW, AAMOMAXD, AAMOMAXUW, AAMOMAXUD:
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// Set aq to use acquire access ordering, which matches Go's memory requirements.
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ins.funct7 = 2
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// Set aqrl to use acquire & release access ordering
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ins.funct7 = 3
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ins.rd, ins.rs1, ins.rs2 = uint32(p.RegTo2), uint32(p.To.Reg), uint32(p.From.Reg)
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case AECALL, AEBREAK, ARDCYCLE, ARDTIME, ARDINSTRET:
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