The Repeat("-", maxInt) call should produce
panic: runtime error: makeslice: len out of range
instead of
panic: strings: Repeat output length overflow
This PR is only for theory perfection.
Change-Id: If67d87b147d666fbbb7238656f2a0cb6cf1dbb5b
GitHub-Last-Rev: 29dc0cb9c9
GitHub-Pull-Request: golang/go#67068
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[Reader.Reader] does not exist in this package.
These docs most likely meant to refer to [Reader] itself.
Change-Id: I4fa117e8541573e0be7c13751fdfc102d5f2d604
Reviewed-on: https://go-review.googlesource.com/c/go/+/582515
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TestNewBufferShallow should be skipped if optimization is disabled.
It is currently failing on no-opt builders.
Change-Id: Ib5e62022a56a4e5f158f247d69a6229d2cb4d99e
Reviewed-on: https://go-review.googlesource.com/c/go/+/581915
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At present, there is no API to reset the underlying []byte
of an existing Buffer struct, except to shallow copy
the entire Buffer struct.
Updates #67004
Change-Id: I08998f7a95ae5bde0897d86247d47f23cd784583
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The document address currently showing the problem is: https://pkg.go.dev/bytes#Buffer.ReadByte
Change-Id: Ib52747e38f72541f3ca2a595aa8eca5d91281c80
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This bottoms out in internal/bytealg.Count, which does a fair amount
of avx shenanigans. Make sure we're not reading out of bounds.
Change-Id: Ied0e461f536f75acc24c6797f7fc74e3f3901c10
Reviewed-on: https://go-review.googlesource.com/c/go/+/533116
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Also rename 'substr' to 'sep' in IndexRabinKarp for consistency.
Change-Id: Icc2ad1116aecaf002c8264daa2fa608306c9a88a
GitHub-Last-Rev: 1784b93f53
GitHub-Pull-Request: golang/go#63854
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This is a follow-up to CL 538175.
Change-Id: Iec2523b36a16d7e157c17858c89fcd43c2470d58
GitHub-Last-Rev: 812d36e57c
GitHub-Pull-Request: golang/go#63770
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…generics
The logic of HashStrBytes, HashStrRevBytes and HashStr, HashStrRev,
are exactly the same, except that the types are different.
Since the bootstrap toolchain is bumped to 1.20, we can eliminate them
by using generics.
Change-Id: I4336b1cab494ba963f09646c169b45f6b1ee62e3
GitHub-Last-Rev: b11a2bf947
GitHub-Pull-Request: golang/go#63766
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Change-Id: I340e892aa4ecc780905be984016efc86699a45a2
Reviewed-on: https://go-review.googlesource.com/c/go/+/533556
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Update the doc comments to use the more idiomatic and common phrase
"reports whether" instead of "tests whether".
Change-Id: I2b7f8cce2d192f66e296ebaa9b37f37e8276b4ae
Reviewed-on: https://go-review.googlesource.com/c/go/+/524898
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To avoid duplicating them in net/netip and os and to allow these
packages automatically benefiting from future performance improvements
when optimized native LastIndexByte{,String} implementations are added.
For #36891
Change-Id: I4905a4742273570c2c36b867df57762c5bfbe1e4
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TestCompareBytes already took into account the -short
testing flag, however, only if not run on one of the Go builders.
This extra condition is no longer necessary as we have much
better longtest coverage than we did when the check was added.
Fixes#61071
Change-Id: I0fc716f4e7baa04019ee00608f223f27c931edcc
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Found by running
$ go run golang.org/x/tools/go/analysis/passes/nilness/cmd/nilness@latest std
No actual bugs--other than one panic(nil)--but a
few places where error nilness was unclear.
Change-Id: Ia916ba30f46f29c1bcf928cc62280169b922463a
Reviewed-on: https://go-review.googlesource.com/c/go/+/486675
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Fixes the misuse of "a" vs "an", according to English grammatical
expectations and using https://www.a-or-an.com/
Change-Id: I53ac724070e3ff3d33c304483fe72c023c7cda47
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I noticed the one in path/filepath while reading the docs,
and the other ones were found via some quick grepping.
Change-Id: I386f2f74ef816a6d18aa2f58ee6b64dbd0147c9e
Reviewed-on: https://go-review.googlesource.com/c/go/+/478795
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This adds a new Buffer.AvailableBuffer method that returns
an empty buffer with a possibly non-empty capacity for use
with append-like APIs.
The typical usage pattern is something like:
b := bb.AvailableBuffer()
b = appendValue(b, v)
bb.Write(b)
It allows logic combining append-like APIs with Buffer
to avoid needing to allocate and manage buffers themselves and
allows the append-like APIs to directly write into the Buffer.
The Buffer.Write method uses the builtin copy function,
which avoids copying bytes if the source and destination are identical.
Thus, Buffer.Write is a constant-time call for this pattern.
Performance:
BenchmarkBufferAppendNoCopy 2.909 ns/op 5766942167.24 MB/s
This benchmark should only be testing the cost of bookkeeping
and never the copying of the input slice.
Thus, the MB/s should be orders of magnitude faster than RAM.
Fixes#53685
Change-Id: I0b41e54361339df309db8d03527689b123f99085
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Change-Id: Ic93ad59119f3549c0f13c4f366f71e9d01b88c47
GitHub-Last-Rev: afb5180472
GitHub-Pull-Request: golang/go#57907
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Change-Id: I63181f6540fc1bfcfc988a16bf9fafbd3575cfdf
GitHub-Last-Rev: d90528730a
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This commit adds an ASCII fast path to bytes/strings EqualFold that
roughly doubles performance when all characters are ASCII.
It also changes strings.EqualFold to use `for range` for the first
string since this is ~10% faster than using utf8.DecodeRuneInString for
both (see #31666).
Performance (similar results on arm64 and amd64):
name old time/op new time/op delta
EqualFold/Tests-10 238ns ± 0% 172ns ± 1% -27.91% (p=0.000 n=10+10)
EqualFold/ASCII-10 20.5ns ± 0% 9.7ns ± 0% -52.73% (p=0.000 n=10+10)
EqualFold/UnicodePrefix-10 86.5ns ± 0% 77.6ns ± 0% -10.37% (p=0.000 n=10+10)
EqualFold/UnicodeSuffix-10 86.8ns ± 2% 71.3ns ± 0% -17.88% (p=0.000 n=10+8)
Change-Id: I058f3f97a08dc04d65af895674d85420f920abe1
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Updates #54854
Change-Id: I9c14f9fa595f73eae44eb714abc5d486915893c1
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This follows on CL 407176 which added this function (in both
packages). This CL makes it consistent with the Cut function,
which uses “before” and “after” in return variable names.
Change-Id: Id4345d2fe0f50bf301a880803e87bf356986b518
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The new Clone function returns a copy of b[:len(b)]
for the input byte slice b.
The result may have additional unused capacity.
Clone(nil) returns nil.
Fixes#45038
Change-Id: I0469a202d77a7b491f1341c08915d07ddd1f0300
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Split should only split strings and not perform mangling
of invalid UTF-8 into ut8.RuneError.
The prior behavior is clearly a bug since mangling is not
performed in all other situations (e.g., separator is non-empty).
Fixes#53511
Change-Id: I112a2ef15ee46ddecda015ee14bca04cd76adfbf
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The Reader.Reset changes the underlying byte slice, so it actually
changes the return value of the Size method.
Fixes#54018
Change-Id: I160deaa2244e95cb93303cb5dfb67a8d90a375ef
GitHub-Last-Rev: b04724a072
GitHub-Pull-Request: golang/go#54020
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As is already done in strings package.
Change-Id: Ia45e6443ddf6beac5e70a1cc493119030e173139
GitHub-Last-Rev: 1174c25035
GitHub-Pull-Request: golang/go#52348
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[This CL is part of a sequence implementing the proposal #51082.
The design doc is at https://go.dev/s/godocfmt-design.]
Run the updated gofmt, which reformats doc comments,
on the main repository. Vendored files are excluded.
For #51082.
Change-Id: I7332f099b60f716295fb34719c98c04eb1a85407
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This CL removes the problem description pointed out by @bjkail.
Second, synchronously modify the comments of the bytes package.
Updates #52022Fixes#52204
Change-Id: I0aa52c774f40bb91f32bebdd2a62a11067a77be0
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So that bytes.SplitN("", "T", int(144115188075855872)) does not panic.
Change-Id: I7c068852bd708416164fc2ed8b84cf6b2d593666
GitHub-Last-Rev: f8df09d65e
GitHub-Pull-Request: golang/go#52147
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Keep returning nil for the cases where we historically returned nil,
even though this is slightly different for TrimLeft and TrimRight.
Fixes#51793
Change-Id: Ifbdfc6b09d52b8e063cfe6341019f9b2eb8b70e9
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Rather than naively making a slice of capacity 2*c+n,
rely on the append(..., make(...)) pattern to allocate a
slice that aligns up to the closest size class.
Performance:
name old time/op new time/op delta
BufferWriteBlock/N4096 3.03µs ± 6% 2.04µs ± 6% -32.60% (p=0.000 n=10+10)
BufferWriteBlock/N65536 47.8µs ± 6% 28.1µs ± 2% -41.32% (p=0.000 n=9+8)
BufferWriteBlock/N1048576 844µs ± 7% 510µs ± 5% -39.59% (p=0.000 n=8+9)
name old alloc/op new alloc/op delta
BufferWriteBlock/N4096 12.3kB ± 0% 7.2kB ± 0% -41.67% (p=0.000 n=10+10)
BufferWriteBlock/N65536 258kB ± 0% 130kB ± 0% -49.60% (p=0.000 n=10+10)
BufferWriteBlock/N1048576 4.19MB ± 0% 2.10MB ± 0% -49.98% (p=0.000 n=10+8)
name old allocs/op new allocs/op delta
BufferWriteBlock/N4096 3.00 ± 0% 3.00 ± 0% ~ (all equal)
BufferWriteBlock/N65536 7.00 ± 0% 7.00 ± 0% ~ (all equal)
BufferWriteBlock/N1048576 11.0 ± 0% 11.0 ± 0% ~ (all equal)
The performance is faster since the growth rate is capped at 2x,
while previously it could grow by amounts potentially much greater than 2x,
leading to significant amounts of memory waste and extra copying.
Credit goes to Martin Möhrmann for suggesting the
append(b, make([]T, n)...) pattern.
Fixes#42984
Updates #51462
Change-Id: I7b23f75dddbf53f8b8b93485bb1a1fff9649b96b
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Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
For #46336
Change-Id: Idc23302085e14e24d571f5995d6d33ca964a0021
Reviewed-on: https://go-review.googlesource.com/c/go/+/382954
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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
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Title doesn't handle Unicode punctuation and language-specific
capitalization rules. Replace the BUG comment with a Deprecated
one, suggesting a more robust alternative, and allowing Title
to be exposed to tooling.
Fixes#48367.
Change-Id: I952f1f37cd35b587a95893fb022827bdd9ec7de9
Reviewed-on: https://go-review.googlesource.com/c/go/+/359485
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Cherry Mui <cherryyz@google.com>
Change-Id: Ieb107fdfccde9f054491f667a384b16f7af71dea
Reviewed-on: https://go-review.googlesource.com/c/go/+/355289
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Improve TestIndexNearPageBoundary to verify needles
ending on a page boundary don't cause a segfault.
Change-Id: I2edb13db63a71dc9955e266f6b97026ee13bf76e
Reviewed-on: https://go-review.googlesource.com/c/go/+/356889
Reviewed-by: Cherry Mui <cherryyz@google.com>
Trust: Lynn Boger <laboger@linux.vnet.ibm.com>
go101
Daniel Martí
qmuntal
Joe Tsai
cui fliter
Mateusz Poliwczak
Mauri de Souza Meneguzzo
Keith Randall
Jes Cok
Matthew Dempsky
Tobias Klauser
Johan Brandhorst-Satzkorn
Mark Ryan
Alan Donovan
hopehook
fangguizhen
Carlo Alberto Ferraris
Charlie Vieth
Joel Sing
cuiweixie
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