| Commit message (Collapse) | Author | Age | Files | Lines |
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AppendByteOrder specifies new methods for LittleEndian and BigEndian
for appending an unsigned integer to a byte slice.
The performance of AppendXXX methods are slower than PutXXX methods
since the former needs to do a few slice operations,
while the latter is essentially a single integer store.
In practice, existing usages of PutXXX performed slicing operations
around the call such that this cost was present, regardless.
name time/op
PutUint16-24 0.48ns ± 2%
AppendUint16-24 1.54ns ± 1%
PutUint32-24 0.46ns ± 2%
AppendUint32-24 0.89ns ± 1%
PutUint64-24 0.46ns ± 2%
AppendUint64-24 0.89ns ± 1%
LittleEndianPutUint16-24 0.47ns ± 2%
LittleEndianAppendUint16-24 1.54ns ± 1%
LittleEndianPutUint32-24 0.45ns ± 3%
LittleEndianAppendUint32-24 0.92ns ± 2%
LittleEndianPutUint64-24 0.46ns ± 3%
LittleEndianAppendUint64-24 0.95ns ± 4%
Fixes #50601
Change-Id: I33d2bbc93a3ce01a9269feac33a2432bc1166ead
Reviewed-on: https://go-review.googlesource.com/c/go/+/386017
Trust: Joseph Tsai <joetsai@digital-static.net>
Trust: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Run-TryBot: Joseph Tsai <joetsai@digital-static.net>
TryBot-Result: Gopher Robot <gobot@golang.org>
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And then revert the bootstrap cmd directories and certain testdata.
And adjust tests as needed.
Not reverting the changes in std that are bootstrapped,
because some of those changes would appear in API docs,
and we want to use any consistently.
Instead, rewrite 'any' to 'interface{}' in cmd/dist for those directories
when preparing the bootstrap copy.
A few files changed as a result of running gofmt -w
not because of interface{} -> any but because they
hadn't been updated for the new //go:build lines.
Fixes #49884.
Change-Id: Ie8045cba995f65bd79c694ec77a1b3d1fe01bb09
Reviewed-on: https://go-review.googlesource.com/c/go/+/368254
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
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The old ioutil references are still valid, but update our code
to reflect best practices and get used to the new locations.
Code compiled with the bootstrap toolchain
(cmd/asm, cmd/dist, cmd/compile, debug/elf)
must remain Go 1.4-compatible and is excluded.
Also excluded vendored code.
For #41190.
Change-Id: I6d86f2bf7bc37a9d904b6cee3fe0c7af6d94d5b1
Reviewed-on: https://go-review.googlesource.com/c/go/+/263142
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
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Benchmarks:
goos: linux
goarch: amd64
BenchmarkReadSlice1000Uint8s-8 4097088 296 ns/op 3381.06 MB/s
BenchmarkWriteSlice1000Uint8s-8 4372588 271 ns/op 3694.96 MB/s
Change-Id: I5b6ef0da5052e3381ee9c714bbff541c11ed0259
Reviewed-on: https://go-review.googlesource.com/c/go/+/246837
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Alberto Donizetti <alb.donizetti@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Alberto Donizetti <alb.donizetti@gmail.com>
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This adds float type support to the main switch blocks in Read and
Write, instead of falling back to reflection. This gives a considerable
speedup for the float types:
ReadFloats-8 129ns ± 9% 70ns ± 8% -46.02% (p=0.001 n=7+7)
WriteFloats-8 131ns ± 6% 86ns ±11% -34.59% (p=0.001 n=7+7)
ReadSlice1000Float32s-8 14.6µs ±14% 4.8µs ±12% -67.29% (p=0.001 n=7+7)
WriteSlice1000Float32s-8 16.4µs ±20% 4.7µs ± 8% -71.01% (p=0.001 n=7+7)
Change-Id: I0be99d068b07d10dd6eb1137b45eff6f7c216b87
GitHub-Last-Rev: 4ff326e99ca35977d819f0ba29c10d9efc7e811c
GitHub-Pull-Request: golang/go#31803
Reviewed-on: https://go-review.googlesource.com/c/go/+/174959
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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Make binary.Read return an error when passed `data` argument is not
a pointer to a fixed-size value or a slice of fixed-size values.
Fixes #32927
Change-Id: I04f48be55fe9b0cc66c983d152407d0e42cbcd95
Reviewed-on: https://go-review.googlesource.com/c/go/+/184957
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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A majority of work is spent in dataSize when en/decoding the same
struct over and over again. This wastes a lot of work, since
the result doesn't change for a given reflect.Value.
Cache the result of the function for structs, so that subsequent
calls to dataSize can avoid doing work.
name old time/op new time/op delta
ReadStruct 1.00µs ± 1% 0.37µs ± 1% -62.99% (p=0.029 n=4+4)
WriteStruct 1.00µs ± 3% 0.37µs ± 1% -62.69% (p=0.008 n=5+5)
name old speed new speed delta
ReadStruct 75.1MB/s ± 1% 202.9MB/s ± 1% +170.16% (p=0.029 n=4+4)
WriteStruct 74.8MB/s ± 3% 200.4MB/s ± 1% +167.96% (p=0.008 n=5+5)
Fixes #34471
Change-Id: Ic5d987ca95f1197415ef93643a0af6fc1224fdf0
Reviewed-on: https://go-review.googlesource.com/c/go/+/199539
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
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This adds new rules to recognize consecutive byte loads and
stores and lowers them to loads and stores such as lhz, lwz, ld,
sth, stw, std. This change only covers the little endian cases
on little endian machines, such as is found in encoding/binary
UintXX or PutUintXX for little endian. Big endian will be done
later.
Updates were also made to binary_test.go to allow the benchmark
for Uint and PutUint to actually use those functions because
the way they were written, those functions were being
optimized out.
Testcases were also added to cmd/compile/internal/gc/asm_test.go.
Updates #22496
The following improvement can be found in golang.org/x/crypto
poly1305:
Benchmark64-16 142 114 -19.72%
Benchmark1K-16 1717 1424 -17.06%
Benchmark64Unaligned-16 142 113 -20.42%
Benchmark1KUnaligned-16 1721 1428 -17.02%
chacha20poly1305:
BenchmarkChacha20Poly1305Open_64-16 1012 885 -12.55%
BenchmarkChacha20Poly1305Seal_64-16 971 836 -13.90%
BenchmarkChacha20Poly1305Open_1350-16 11113 9539 -14.16%
BenchmarkChacha20Poly1305Seal_1350-16 11013 9392 -14.72%
BenchmarkChacha20Poly1305Open_8K-16 61074 53431 -12.51%
BenchmarkChacha20Poly1305Seal_8K-16 61214 54806 -10.47%
Other improvements of around 10% found in crypto/tls.
Results after updating encoding/binary/binary_test.go:
BenchmarkLittleEndianPutUint64-16 1.87 0.93 -50.27%
BenchmarkLittleEndianPutUint32-16 1.19 0.93 -21.85%
BenchmarkLittleEndianPutUint16-16 1.16 1.03 -11.21%
Change-Id: I7bbe2fbcbd11362d58662fecd907a0c07e6ca2fb
Reviewed-on: https://go-review.googlesource.com/74410
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Munday <mike.munday@ibm.com>
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rolw 8 on AMD64
... and same for stores. This does for binary.BigEndian.Uint16() what
was already done for Uint32 and Uint64 with BSWAP in 10f75748 (CL 32222).
Here is how generated code changes e.g. for the following function
(omitting saying the same prologue/epilogue):
func get16(b [2]byte) uint16 {
return binary.BigEndian.Uint16(b[:])
}
"".get16 t=1 size=21 args=0x10 locals=0x0
// before
0x0000 00000 (x.go:15) MOVBLZX "".b+9(FP), AX
0x0005 00005 (x.go:15) MOVBLZX "".b+8(FP), CX
0x000a 00010 (x.go:15) SHLL $8, CX
0x000d 00013 (x.go:15) ORL CX, AX
// after
0x0000 00000 (x.go:15) MOVWLZX "".b+8(FP), AX
0x0005 00005 (x.go:15) ROLW $8, AX
encoding/binary is speedup overall a bit:
name old time/op new time/op delta
ReadSlice1000Int32s-4 4.83µs ± 0% 4.83µs ± 0% ~ (p=0.206 n=4+5)
ReadStruct-4 1.29µs ± 2% 1.28µs ± 1% -1.27% (p=0.032 n=4+5)
ReadInts-4 384ns ± 1% 385ns ± 1% ~ (p=0.968 n=4+5)
WriteInts-4 534ns ± 3% 526ns ± 0% -1.54% (p=0.048 n=4+5)
WriteSlice1000Int32s-4 5.02µs ± 0% 5.11µs ± 3% ~ (p=0.175 n=4+5)
PutUint16-4 0.59ns ± 0% 0.49ns ± 2% -16.95% (p=0.016 n=4+5)
PutUint32-4 0.52ns ± 0% 0.52ns ± 0% ~ (all equal)
PutUint64-4 0.53ns ± 0% 0.53ns ± 0% ~ (all equal)
PutUvarint32-4 19.9ns ± 0% 19.9ns ± 1% ~ (p=0.556 n=4+5)
PutUvarint64-4 54.5ns ± 1% 54.2ns ± 0% ~ (p=0.333 n=4+5)
name old speed new speed delta
ReadSlice1000Int32s-4 829MB/s ± 0% 828MB/s ± 0% ~ (p=0.190 n=4+5)
ReadStruct-4 58.0MB/s ± 2% 58.7MB/s ± 1% +1.30% (p=0.032 n=4+5)
ReadInts-4 78.0MB/s ± 1% 77.8MB/s ± 1% ~ (p=0.968 n=4+5)
WriteInts-4 56.1MB/s ± 3% 57.0MB/s ± 0% ~ (p=0.063 n=4+5)
WriteSlice1000Int32s-4 797MB/s ± 0% 783MB/s ± 3% ~ (p=0.190 n=4+5)
PutUint16-4 3.37GB/s ± 0% 4.07GB/s ± 2% +20.83% (p=0.016 n=4+5)
PutUint32-4 7.73GB/s ± 0% 7.72GB/s ± 0% ~ (p=0.556 n=4+5)
PutUint64-4 15.1GB/s ± 0% 15.1GB/s ± 0% ~ (p=0.905 n=4+5)
PutUvarint32-4 201MB/s ± 0% 201MB/s ± 0% ~ (p=0.905 n=4+5)
PutUvarint64-4 147MB/s ± 1% 147MB/s ± 0% ~ (p=0.286 n=4+5)
( "a bit" only because most of the time is spent in reflection-like things
there, not actual bytes decoding. Even for direct PutUint16 benchmark the
looping adds overhead and lowers visible benefit. For code-generated encoders /
decoders actual effect is more than 20% )
Adding Uint32 and Uint64 raw benchmarks too for completeness.
NOTE I had to adjust load-combining rule for bswap case to match first 2 bytes
loads as result of "2-bytes load+shift" -> "loadw + rorw 8" rewrite. Reason is:
for loads+shift, even e.g. into uint16 var
var b []byte
var v uin16
v = uint16(b[1]) | uint16(b[0])<<8
the compiler eventually generates L(ong) shift - SHLLconst [8], probably
because it is more straightforward / other reasons to work on the whole
register. This way 2 bytes rewriting rule is using SHLLconst (not SHLWconst) in
its pattern, and then it always gets matched first, even if 2-byte rule comes
syntactically after 4-byte rule in AMD64.rules because 4-bytes rule seemingly
needs more applyRewrite() cycles to trigger. If 2-bytes rule gets matched for
inner half of
var b []byte
var v uin32
v = uint32(b[3]) | uint32(b[2])<<8 | uint32(b[1])<<16 | uint32(b[0])<<24
and we keep 4-byte load rule unchanged, the result will be MOVW + RORW $8 and
then series of byte loads and shifts - not one MOVL + BSWAPL.
There is no such problem for stores: there compiler, since it probably knows
store destination is 2 bytes wide, uses SHRWconst 8 (not SHRLconst 8) and thus
2-byte store rule is not a subset of rule for 4-byte stores.
Fixes #17151 (int16 was last missing piece there)
Change-Id: Idc03ba965bfce2b94fef456b02ff6742194748f6
Reviewed-on: https://go-review.googlesource.com/34636
Reviewed-by: Ilya Tocar <ilya.tocar@intel.com>
Run-TryBot: Ilya Tocar <ilya.tocar@intel.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
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This change adds support for decoding and encoding the bool type. The
encoding is a single byte, with a zero value for false and a non-zero
value for true.
Closes #16856.
Change-Id: I1d1114b320263691473bb100cad0f380e0204186
Reviewed-on: https://go-review.googlesource.com/28514
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
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The inserted early bound checks cause the slice
to expand beyond the original length of the slice.
Change-Id: Ib38891605f4a9a12d3b9e2071a5f77640b083d2d
Reviewed-on: https://go-review.googlesource.com/20981
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Minux Ma <minux@golang.org>
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Change-Id: I9e887a0b32baf0adc85fa9e4b85b319e8ef333e9
Reviewed-on: https://go-review.googlesource.com/20853
Reviewed-by: Russ Cox <rsc@golang.org>
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Change-Id: I0f4b6752ecc8b4945ecfde627cdec13fc4bb6a69
Reviewed-on: https://go-review.googlesource.com/20850
Reviewed-by: Russ Cox <rsc@golang.org>
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The tree's pretty inconsistent about single space vs double space
after a period in documentation. Make it consistently a single space,
per earlier decisions. This means contributors won't be confused by
misleading precedence.
This CL doesn't use go/doc to parse. It only addresses // comments.
It was generated with:
$ perl -i -npe 's,^(\s*// .+[a-z]\.) +([A-Z]),$1 $2,' $(git grep -l -E '^\s*//(.+\.) +([A-Z])')
$ go test go/doc -update
Change-Id: Iccdb99c37c797ef1f804a94b22ba5ee4b500c4f7
Reviewed-on: https://go-review.googlesource.com/20022
Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Dave Day <djd@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
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This is a subset of https://golang.org/cl/20022 with only the copyright
header lines, so the next CL will be smaller and more reviewable.
Go policy has been single space after periods in comments for some time.
The copyright header template at:
https://golang.org/doc/contribute.html#copyright
also uses a single space.
Make them all consistent.
Change-Id: Icc26c6b8495c3820da6b171ca96a74701b4a01b0
Reviewed-on: https://go-review.googlesource.com/20111
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
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Also add a unit test to lock this behavior into the API.
Fixes #12016
Change-Id: Ib6ec6e7948f0705f3504ede9143b5dc4e790fc44
Reviewed-on: https://go-review.googlesource.com/15171
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
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In the process, simplified internal sizeOf and
dataSize functions. Minor positive impact on
performance. Added test case.
benchmark old ns/op new ns/op delta
BenchmarkReadSlice1000Int32s 14006 14122 +0.83%
BenchmarkReadStruct 2508 2447 -2.43%
BenchmarkReadInts 921 928 +0.76%
BenchmarkWriteInts 2086 2081 -0.24%
BenchmarkWriteSlice1000Int32s 13440 13497 +0.42%
BenchmarkPutUvarint32 28.5 26.3 -7.72%
BenchmarkPutUvarint64 81.3 76.7 -5.66%
benchmark old MB/s new MB/s speedup
BenchmarkReadSlice1000Int32s 285.58 283.24 0.99x
BenchmarkReadStruct 27.90 28.60 1.03x
BenchmarkReadInts 32.57 32.31 0.99x
BenchmarkWriteInts 14.38 14.41 1.00x
BenchmarkWriteSlice1000Int32s 297.60 296.36 1.00x
BenchmarkPutUvarint32 140.55 151.92 1.08x
BenchmarkPutUvarint64 98.36 104.33 1.06x
Fixes #6818.
LGTM=r
R=r
CC=golang-codereviews
https://golang.org/cl/149290045
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Preparation was in CL 134570043.
This CL contains only the effect of 'hg mv src/pkg/* src'.
For more about the move, see golang.org/s/go14nopkg.
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