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The CV add changes according to TODO in Go source-code.
Internal atomic set does not comply with sync/atomic library and has shortage
operations for signed integers.
This patch extend internal atomic set by Int32 and Int64 operations. It's
implemented new aliases and asm versions of operations. As a result Cas64 was
replaced by Casint64 in findRunnableGCWorker without type casting.
Another purpose is unified structure of internal atomics' source code. Before,
assembly impementations for different archs were in different files. For
example, filename for AMD64 was asm_amd64.s, but filename for RISC-V was
atomic_riscv64.s. Some arches have both files without any meaning. So, assembly
files were merged and renamed to atomic_{$ARCH}.s filenames.
Change-Id: I29a05a7cbf5f4a9cc146e8315536c038af545677
Reviewed-on: https://go-review.googlesource.com/c/go/+/289152
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
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These will be used in a following CL to perform larger bit clear and bit
set than And8/Or8.
Change-Id: I60f7b1099e29b69eb64add77564faee862880a8d
Reviewed-on: https://go-review.googlesource.com/c/go/+/260977
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Trust: Michael Pratt <mpratt@google.com>
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Add an internal atomic intrinsic for load with acquire semantics
(extending LoadAcq to 64b) and add LoadAcquintptr for internal
use within the sync package. For other arches, this remaps to the
appropriate atomic.Load{,64} intrinsic which should not alter code
generation.
Similarly, add StoreRel{uintptr,64} for consistency, and inline.
Finally, add an exception to allow sync to directly use the
runtime/internal/atomic package which avoids more convoluted
workarounds (contributed by Lynn Boger).
In an extreme example, sync.(*Pool).pin consumes 20% of wall time
during fmt tests. This is reduced to 5% on ppc64le/power9.
From the fmt benchmarks on ppc64le:
name old time/op new time/op delta
SprintfPadding 468ns ± 0% 451ns ± 0% -3.63%
SprintfEmpty 73.3ns ± 0% 51.9ns ± 0% -29.20%
SprintfString 135ns ± 0% 122ns ± 0% -9.63%
SprintfTruncateString 232ns ± 0% 214ns ± 0% -7.76%
SprintfTruncateBytes 216ns ± 0% 202ns ± 0% -6.48%
SprintfSlowParsingPath 162ns ± 0% 142ns ± 0% -12.35%
SprintfQuoteString 1.00µs ± 0% 0.99µs ± 0% -1.39%
SprintfInt 117ns ± 0% 104ns ± 0% -11.11%
SprintfIntInt 190ns ± 0% 175ns ± 0% -7.89%
SprintfPrefixedInt 232ns ± 0% 212ns ± 0% -8.62%
SprintfFloat 270ns ± 0% 255ns ± 0% -5.56%
SprintfComplex 1.01µs ± 0% 0.99µs ± 0% -1.68%
SprintfBoolean 127ns ± 0% 111ns ± 0% -12.60%
SprintfHexString 220ns ± 0% 198ns ± 0% -10.00%
SprintfHexBytes 261ns ± 0% 252ns ± 0% -3.45%
SprintfBytes 600ns ± 0% 590ns ± 0% -1.67%
SprintfStringer 684ns ± 0% 658ns ± 0% -3.80%
SprintfStructure 2.57µs ± 0% 2.57µs ± 0% -0.12%
ManyArgs 669ns ± 0% 646ns ± 0% -3.44%
FprintInt 140ns ± 0% 136ns ± 0% -2.86%
FprintfBytes 184ns ± 0% 181ns ± 0% -1.63%
FprintIntNoAlloc 140ns ± 0% 136ns ± 0% -2.86%
ScanInts 929µs ± 0% 921µs ± 0% -0.79%
ScanRecursiveInt 122ms ± 0% 121ms ± 0% -0.11%
ScanRecursiveIntReaderWrapper 122ms ± 0% 122ms ± 0% -0.18%
Change-Id: I4d66780261b57b06ef600229e475462e7313f0d6
Reviewed-on: https://go-review.googlesource.com/c/go/+/253748
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
Reviewed-by: Keith Randall <khr@golang.org>
Trust: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Go Bot <gobot@golang.org>
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We already have Load8, And8, and Or8.
For #10958, #24543, but makes sense on its own.
Change-Id: I478529fc643edc57efdeccaae413c99edd19b2eb
Reviewed-on: https://go-review.googlesource.com/c/go/+/203283
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
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Change-Id: Id52a5730cf9207ee7ccebac4ef12791dc5720e7c
Reviewed-on: https://go-review.googlesource.com/c/go/+/172283
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
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This change creates the infrastructure for new lightweight atomics
primitives in runtime/internal/atomic:
- LoadAcq, for load-acquire
- StoreRel, for store-release
- CasRel, for Compare-and-Swap-release
and implements them for ppc64x. There is visible performance improvement
in producer-consumer scenarios, like BenchmarkChanProdCons*:
benchmark old ns/op new ns/op delta
BenchmarkChanProdCons0-48 2034 2034 +0.00%
BenchmarkChanProdCons10-48 1798 1608 -10.57%
BenchmarkChanProdCons100-48 1596 1585 -0.69%
BenchmarkChanProdConsWork0-48 2084 2046 -1.82%
BenchmarkChanProdConsWork10-48 1829 1668 -8.80%
BenchmarkChanProdConsWork100-48 1650 1650 +0.00%
Fixes #21348
Change-Id: I1f6ce377e4a0fe4bd7f5f775e8036f50070ad8db
Reviewed-on: https://go-review.googlesource.com/c/142277
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
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Change-Id: I99a48f719fd1a8178fc59787084a074e91c89ac6
Reviewed-on: https://go-review.googlesource.com/31489
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
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