Fixes the misuse of "a" vs "an", according to English grammatical
expectations and using https://www.a-or-an.com/
Change-Id: I53ac724070e3ff3d33c304483fe72c023c7cda47
Reviewed-on: https://go-review.googlesource.com/c/go/+/480536
Run-TryBot: shuang cui <imcusg@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
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Auto-Submit: Ian Lance Taylor <iant@google.com>
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Reviewed-by: Michael Knyszek <mknyszek@google.com>
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
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
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Most of these are one-off mistakes. Only one file was all spaces.
Change-Id: I277c3ce4a4811aa4248c90676f66bc775ae8d062
Reviewed-on: https://go-review.googlesource.com/c/go/+/478976
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This change introduces the Compare and Compare32 functions
based on the total-ordering predicate in IEEE-754, section 5.10.
In particular,
* -NaN is ordered before any other value
* +NaN is ordered after any other value
* -0 is ordered before +0
* All other values are ordered the usual way
Compare-8 0.4537n ± 1%
Compare32-8 0.3752n ± 1%
geomean 0.4126n
Fixes#56491.
Change-Id: I5c9c77430a2872f380688c1b0a66f2105b77d5ac
Reviewed-on: https://go-review.googlesource.com/c/go/+/467515
Reviewed-by: WANG Xuerui <git@xen0n.name>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
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Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
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Change-Id: I16ec916b47de2f417b681c8abff5a1375ddf491b
Reviewed-on: https://go-review.googlesource.com/c/go/+/468055
Run-TryBot: Ian Lance Taylor <iant@google.com>
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Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
It currently says only what it wasn't good for, which is not helpful.
Change-Id: I468c7f385c14eaca99788a94d53c30b729ed0944
Reviewed-on: https://go-review.googlesource.com/c/go/+/466276
Reviewed-by: Ian Lance Taylor <iant@google.com>
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This change introduces the Compare and Compare32 functions
based on the total-ordering predicate in IEEE-754, section 5.10.
In particular,
* -NaN is ordered before any other value
* +NaN is ordered after any other value
* -0 is ordered before +0
* All other values are ordered the usual way
name time/op
Compare-8 0.24ns ± 1%
Compare32-8 0.24ns ± 0%
Fixes#56491.
Change-Id: I9444fbfefe26741794c4436a26d403b8da97bdaf
Reviewed-on: https://go-review.googlesource.com/c/go/+/459435
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This operation converts a big.Int to float64,
reporting the accuracy of the result, with
a fast path in hardware.
Fixes#56984
Change-Id: I86d0fb0e105a06a4009986f2f5fd87a4d446f6f9
Reviewed-on: https://go-review.googlesource.com/c/go/+/453115
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The existing implementation does a float64 to int64 conversion in order to check whether the number is odd, however it does not check for overflows. If an overflow occurs, the result is implementation-defined and while it happens to work on amd64 and i386, it produces an incorrect result on arm64 and possibly other architectures.
This change fixes that and also avoids calling isOddInt altogether if the base is +0, because it's unnecessary.
(I was considering avoiding the extra check if runtime.GOARCH is "amd64" or "i386", but I can't see this pattern being used anywhere outside the tests. And having separate files with build tags just for isOddInt() seems like an overkill)
Fixes#57465
Change-Id: Ieb243796194412aa6b98fac05fd19766ca2413ef
GitHub-Last-Rev: 3bfbd85c4c
GitHub-Pull-Request: golang/go#57494
Reviewed-on: https://go-review.googlesource.com/c/go/+/459815
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Allow GODEBUG users to report how many times a setting
resulted in non-default behavior.
Record non-default-behaviors for all existing GODEBUGs.
Also rework tests to ensure that runtime is in sync with runtime/metrics.All,
and generate docs mechanically from metrics.All.
For #56986.
Change-Id: Iefa1213e2a5c3f19ea16cd53298c487952ef05a4
Reviewed-on: https://go-review.googlesource.com/c/go/+/453618
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This will let us reuse it in crypto/ecdsa for the NIST scalar fields.
The main change in API is around encoding and decoding. The SetBytes +
ExpandFor sequence was hacky: SetBytes could produce a bigger size than
the modulus if leading zeroes in the top byte overflowed the limb
boundary, so ExpandFor had to check for and tolerate that. Also, the
caller was responsible for checking that the overflow was actually all
zeroes (which we weren't doing, exposing a crasher in decryption and
signature verification) and then for checking that the result was less
than the modulus. Instead, make SetBytes take a modulus and return an
error if the value overflows. Same with Bytes: we were always allocating
based on Size before FillBytes anyway, so now Bytes takes a modulus.
Finally, SetBig was almost only used for moduli, so replaced
NewModulusFromNat and SetBig with NewModulusFromBig.
Moved the constant-time bitLen to math/big.Int.BitLen. It's slower, but
BitLen is primarily used in cryptographic code, so it's safer this way.
Change-Id: Ibaf7f36d80695578cb80484167d82ce1aa83832f
Reviewed-on: https://go-review.googlesource.com/c/go/+/450055
Auto-Submit: Filippo Valsorda <filippo@golang.org>
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Reviewed-by: Roland Shoemaker <roland@golang.org>
Change-Id: I69065f8adf101fdb28682c55997f503013a50e29
Reviewed-on: https://go-review.googlesource.com/c/go/+/449757
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Joedian Reid <joedian@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
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Programs that call Seed and then expect a specific sequence
of results from the global random source (using functions such as Int)
can be broken when a dependency changes how much it consumes
from the global random source. To avoid such breakages, programs
that need a specific result sequence should use NewRand(NewSource(seed))
to obtain a random generator that other packages cannot access.
Fixes#56319.
Change-Id: Idac33991b719d2c71f109f51dacb3467a649e01e
Reviewed-on: https://go-review.googlesource.com/c/go/+/451375
Reviewed-by: Ian Lance Taylor <iant@google.com>
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We have been expanding our use of GODEBUG for compatibility,
and the current implementation forces a tradeoff between
freshness and efficiency. It parses the environment variable
in full each time it is called, which is expensive. But if clients
cache the result, they won't respond to run-time GODEBUG
changes, as happened with x509sha1 (#56436).
This CL changes the GODEBUG API to provide efficient,
up-to-date results. Instead of a single Get function,
New returns a *godebug.Setting that itself has a Get method.
Clients can save the result of New, which is no more expensive
than errors.New, in a global variable, and then call that
variable's Get method to get the value. Get costs only two
atomic loads in the case where the variable hasn't changed
since the last call.
Unfortunately, these changes do require importing sync
from godebug, which will mean that sync itself will never
be able to use a GODEBUG setting. That doesn't seem like
such a hardship. If it was really necessary, the runtime could
pass a setting to package sync itself at startup, with the
caveat that that setting, like the ones used by runtime itself,
would not respond to run-time GODEBUG changes.
Change-Id: I99a3acfa24fb2a692610af26a5d14bbc62c966ac
Reviewed-on: https://go-review.googlesource.com/c/go/+/449504
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Change-Id: I7605bcbbaa64bb4273ad458a157b1c6011467973
Reviewed-on: https://go-review.googlesource.com/c/go/+/447915
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Change-Id: Iabf955cdb161d02cb4a3e06f466b331e1b6eb2c2
Signed-off-by: cui fliter <imcusg@gmail.com>
Reviewed-on: https://go-review.googlesource.com/c/go/+/447456
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This change improves the performance of Binomial by implementing an
algorithm that produces smaller intermediate values at each step.
Working with smaller big.Int values has the advantage that fewer allocations
and computations are required for each mathematical operation.
The algorithm used is the Multiplicative Formula, which is a well known
way of calculating the Binomial coefficient and is described at:
https://en.wikipedia.org/wiki/Binomial_coefficient#Multiplicative_formulahttps://en.wikipedia.org/wiki/Binomial_coefficient#In_programming_languages
In addition to that, an optimization has been made to remove a
redundant computation of (i+1) on each loop which has a measurable
impact when using big.Int.
Performance improvement measured on an M1 MacBook Pro
running the existing benchmark for Binomial:
name old time/op new time/op delta
Binomial-8 589ns ± 0% 435ns ± 0% -26.05% (p=0.000 n=10+10)
name old alloc/op new alloc/op delta
Binomial-8 1.02kB ± 0% 0.08kB ± 0% -92.19% (p=0.000 n=10+10)
name old allocs/op new allocs/op delta
Binomial-8 38.0 ± 0% 5.0 ± 0% -86.84% (p=0.000 n=10+10)
Change-Id: I5a830386dd42f062e17af88411dd74fcb110ded9
GitHub-Last-Rev: 6b2fca07de
GitHub-Pull-Request: golang/go#56339
Reviewed-on: https://go-review.googlesource.com/c/go/+/444315
Auto-Submit: Robert Griesemer <gri@google.com>
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Reviewed-by: Robert Griesemer <gri@google.com>
Run-TryBot: Robert Griesemer <gri@google.com>
For #20661.
Change-Id: I1e638cb619e643eadc210d71f92bd1af7bafc912
Reviewed-on: https://go-review.googlesource.com/c/go/+/436955
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As of CL 443058, rand.Seed is not necessary to call,
nor is it a particular good idea.
For #54880.
Change-Id: If9d70763622c09008599db8c97a90fcbe285c6f8
Reviewed-on: https://go-review.googlesource.com/c/go/+/445395
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Implement proposal #54880, to automatically seed the global source.
The justification for this not being a breaking change is that any
use of the global source in a package's init function or exported API
clearly must be valid - that is, if a package changes how much
randomness it consumes at init time or in an exported API, that
clearly isn't the kind of breaking change that requires issuing a v2
of that package. That kind of per-package change in the position
of the global source is indistinguishable from seeding the global
source differently. So if the per-package change is valid, so is auto-seeding.
And then, of course, auto-seeding means that packages will be
far less likely to depend on the specific results of the global source
and therefore not break when those kinds of per-package changes
happen in the future.
Seed(1) can be called in programs that need the old sequence from
the global source and want to restore the old behavior.
Of course, those programs will still be broken by the per-package
changes just described, and it would be better for them to allocate
local sources rather than continue to use the global one.
Fixes#54880.
Change-Id: Ib9dc3307b97f7a45587a9cc50d81f919d3edc7ae
Reviewed-on: https://go-review.googlesource.com/c/go/+/443058
Reviewed-by: Austin Clements <austin@google.com>
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It was noted in the go1.9 release notes that functions in math/bits
may be implemented by compiler intrinsics, but this never made it to
the documentation.
This change adapts the wording of the release notes and puts it in the
documentation for math/bits.
Change-Id: Ibeea88eaf7df10952cbe670885e910ac30b49d55
Reviewed-on: https://go-review.googlesource.com/c/go/+/444035
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This sets up for delaying the decision of which seed to use,
but this CL still keeps the original global Seed(1) semantics.
Preparation for #54880.
Change-Id: Ibfa9d50ec9023aa755a83852e55168fa7d24b115
Reviewed-on: https://go-review.googlesource.com/c/go/+/443057
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Fixes#56156
Change-Id: Ib85ff45f0b0d0eac83c39606ee20b3a312e6e919
Reviewed-on: https://go-review.googlesource.com/c/go/+/442335
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This CL optimizes the Hypot function by putting the Abs function in
front of the IsInf check. This simplifies the judgment of IsInf.
Benchmarks:
On linux/arm64,
name old time/op new time/op delta
Hypot-160 5.26ns ± 0% 4.53ns ± 0% -13.84% (p=0.000 n=4+5)
HypotGo-160 5.19ns ± 0% 4.85ns ± 0% -6.53% (p=0.008 n=5+5)
On linux/amd64,
name old time/op new time/op delta
Hypot-44 5.99ns ± 0% 5.99ns ± 0% ~ (p=0.667 n=5+5)
HypotGo-44 7.46ns ± 0% 6.61ns ± 0% -11.37% (p=0.008 n=5+5)
On darwin/arm64,
name old time/op new time/op delta
Hypot-8 3.58ns ± 0% 2.79ns ± 0% -22.01% (p=0.008 n=5+5)
HypotGo-8 3.58ns ± 0% 2.79ns ± 0% -22.15% (p=0.008 n=5+5)
Change-Id: Id79236e01d9494b6e00bbda3ec08c72caf5ef3c1
Reviewed-on: https://go-review.googlesource.com/c/go/+/414974
Reviewed-by: Cherry Mui <cherryyz@google.com>
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Happy to use another service if web.archive.org isn't suitable.
Note: the original page redirects and then links to some nsfw content.
Change-Id: Ie93ca0c6aad871881f35b7e5609b96da5c14cfc0
GitHub-Last-Rev: ced5a97eb5
GitHub-Pull-Request: golang/go#54857
Reviewed-on: https://go-review.googlesource.com/c/go/+/428236
Reviewed-by: Keith Randall <khr@golang.org>
Auto-Submit: Keith Randall <khr@golang.org>
Reviewed-by: Robert Griesemer <gri@google.com>
Reviewed-by: Keith Randall <khr@google.com>
This CL make math.sqrt an intrinsic function, math.Sqrt is not affected
since compiler can inline it. With this change, we can remove all assembly
code for math.Sqrt that aims to speed up indirect call. The go compiler can
generate same or faster code (with regabi) for indirect call.
Benchmark on amd64:
name old time/op new time/op delta
SqrtIndirect 2.60ns ± 3% 1.03ns ± 4% -60.24% (p=0.000 n=10+10)
SqrtLatency 3.40ns ± 1% 3.32ns ± 1% -2.26% (p=0.000 n=10+8)
SqrtIndirectLatency 6.09ns ± 0% 3.31ns ± 0% -45.67% (p=0.000 n=10+10)
SqrtGoLatency 36.1ns ± 6% 34.6ns ± 1% ~ (p=0.101 n=10+10)
SqrtPrime 2.53µs ± 2% 2.55µs ± 6% ~ (p=0.398 n=9+9)
Change-Id: If4be0f242c1d9d4feca7d269fc9cd6e6066f163d
Reviewed-on: https://go-review.googlesource.com/c/go/+/421074
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So we don't have to duplicate the logic to detect noopt builder in
multiple places.
Based on khr@'s suggestion in CL 422037.
Change-Id: Idb338e8bc08cdf00460574bfc0d2f7018c79bbd5
Reviewed-on: https://go-review.googlesource.com/c/go/+/422038
Reviewed-by: Than McIntosh <thanm@google.com>
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Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Since when that test requires inlining, which is disabled on noopt
builder.
Updates #29951
Change-Id: I9d7a0a64015a30d3bfb5ad5d806ea0955657fda3
Reviewed-on: https://go-review.googlesource.com/c/go/+/422039
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
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Mark the assembly routines as not escaping their arguments.
Add a special case to NewInt that, when inlined, can do all
of its allocations (a big.Int and a [1]Word) on the stack.
Update #29951
Change-Id: I9bd38c262eb97df98c0ed9874da7daac381243ea
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Contributors to the loong64 port are:
Weining Lu <luweining@loongson.cn>
Lei Wang <wanglei@loongson.cn>
Lingqin Gong <gonglingqin@loongson.cn>
Xiaolin Zhao <zhaoxiaolin@loongson.cn>
Meidan Li <limeidan@loongson.cn>
Xiaojuan Zhai <zhaixiaojuan@loongson.cn>
Qiyuan Pu <puqiyuan@loongson.cn>
Guoqi Chen <chenguoqi@loongson.cn>
This port has been updated to Go 1.15.6:
https://github.com/loongson/go
Updates #46229
Change-Id: I2ad9ed01fc913b90e75023ac0fa70de87a9f5de1
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Excluding vendor and testdata.
CL 384268 already reformatted most, but these slipped past.
The struct in the doc comment in debug/dwarf/type.go
was fixed up by hand to indent the first and last lines as well.
For #51082.
Change-Id: Iad020f83aafd671ff58238fe491907e85923d0c7
Reviewed-on: https://go-review.googlesource.com/c/go/+/407137
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Make some code more simple.
Change-Id: I801adf0dba5f6c515681345c732dbb907f945419
GitHub-Last-Rev: a505146bac
GitHub-Pull-Request: golang/go#49626
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This CL updates big.Jacobi to avoid forcing its y argument to escape
to the heap. The argument was escaping because it was being passed
through an empty interface to fmt.Sprintf during an assertion failure.
As a result, callers of Jacobi and Int.ModSqrt (which calls Jacobi)
could not keep this value on the stack.
Noticed when working on https://github.com/cockroachdb/apd/pull/103.
Change-Id: I5db9ee2149bf13b921886929425861721b53b085
GitHub-Last-Rev: 3ee07b5dc3
GitHub-Pull-Request: golang/go#50527
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Reviewed-by: Robert Griesemer <gri@golang.org>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Now gc can generate the same assembly code.
Change-Id: Iac503003e14045d63e2def66408c13cee516aa37
Reviewed-on: https://go-review.googlesource.com/c/go/+/402575
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Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Run-TryBot: Wayne Zuo <wdvxdr@golangcn.org>
Auto-Submit: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
TestAlias checks systematically for aliasing issues, where passing the
same value for an argument and the receiver leads to incorrect results.
We had a number of issues like that over the years:
- #31084: Lsh on arm64
- #30217: GCD
- #22830: Exp due to divLarge
- #22265: ModSqrt
- #20490: Add and Sub
- #11284: GCD
This CL also fixes two new minor bugs that the test found. A wrong
result would be returned by
- Exp when the modulo and the receiver alias
- Rand when the limit is negative and it aliases the receiver
The test runs in ~0.05s with the default -quickchecks value.
Change-Id: I8354069ec9886e40c60f2642342ee08e604befb7
Reviewed-on: https://go-review.googlesource.com/c/go/+/168257
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Reviewed-by: Roland Shoemaker <roland@golang.org>
Auto-Submit: Filippo Valsorda <filippo@golang.org>
Run-TryBot: Filippo Valsorda <filippo@golang.org>
Name the arguments in a way that is more self-describing.
Many code editor tools show a snippet of the function and
its arguments. However, "x" and "y" are not helpful in determining
which is the sign and which is the magnitude,
short of reading the documentation itself.
Name the sign argument as "sign" to be explicit.
This follows the same naming convention as IsInf.
Change-Id: Ie3055009e475f96c92d5ea7bfe9828eed908c78b
Reviewed-on: https://go-review.googlesource.com/c/go/+/400177
Run-TryBot: Joseph Tsai <joetsai@digital-static.net>
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Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
[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
Reviewed-on: https://go-review.googlesource.com/c/go/+/384268
Reviewed-by: Jonathan Amsterdam <jba@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
go/doc in all its forms applies this replacement when rendering
the comments. We are considering formatting doc comments,
including doing this replacement as part of the formatting.
Apply it to our source files ahead of time.
For #51082.
Change-Id: Ifcc1f5861abb57c5d14e7d8c2102dfb31b7a3a19
Reviewed-on: https://go-review.googlesource.com/c/go/+/384262
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
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A future change to gofmt will rewrite
// Doc comment.
//
func f()
to
// Doc comment.
func f()
Apply that change preemptively to all doc comments.
For #51082.
Change-Id: I4023e16cfb0729b64a8590f071cd92f17343081d
Reviewed-on: https://go-review.googlesource.com/c/go/+/384259
Trust: Russ Cox <rsc@golang.org>
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For whatever reason (perhaps some tool does this), a handful of comments,
including some doc comments, have TODOs formatted like:
// TODO(name): Text here and
// more text aligned
// under first text.
In doc comments the second line turns into a <pre> block,
which is undesirable in this context.
Rewrite those to unindent, like this instead:
// TODO(name): Text here and
// more text aligned
// at left column.
For #51082.
Change-Id: Ibf5145659a61ebf9496f016752a709a7656d2d4b
Reviewed-on: https://go-review.googlesource.com/c/go/+/384258
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
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A run of lines that are indented with any number of spaces or tabs
format as a <pre> block. This commit fixes various doc comments
that format badly according to that (standard) rule.
For example, consider:
// - List item.
// Second line.
// - Another item.
Because the - lines are unindented, this is actually two paragraphs
separated by a one-line <pre> block. This CL rewrites it to:
// - List item.
// Second line.
// - Another item.
Today, that will format as a single <pre> block.
In a future release, we hope to format it as a bulleted list.
Various other minor fixes as well, all in preparation for reformatting.
For #51082.
Change-Id: I95cf06040d4186830e571cd50148be3bf8daf189
Reviewed-on: https://go-review.googlesource.com/c/go/+/384257
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
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After CL 24430, reflect.DeepEqual no longer returns true when comparing
a *Rat built with (*Rat).SetString("0") with one built with
(*Rat).SetInt64(0).
These should be equivalent, but because (*Rat).SetString does not call
norm() when returning the zero value, the result of reflect.DeepEqual
will be false.
One could suggest that developers should use (*Rat).Cmp instead
of relying on reflect.DeepEqual, but if a (*Rat) is part of a
larger struct that is being compared, this can be cumbersome.
This is fixed by calling z.norm() when returning zero in SetString.
Fixes#50944
Change-Id: Ib84ae975bf82fe02d1203aa9668a01960c0fd59d
Reviewed-on: https://go-review.googlesource.com/c/go/+/364434
Reviewed-by: Katie Hockman <katie@golang.org>
Trust: Katie Hockman <katie@golang.org>
Trust: Ian Lance Taylor <iant@golang.org>
Change-Id: I7dfae0fc91c2d70873ec7ec920be7c0a4888153a
Reviewed-on: https://go-review.googlesource.com/c/go/+/390175
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Trust: Daniel Martí <mvdan@mvdan.cc>
Credit to rsc@ for the original patch.
Thanks to the OSS-Fuzz project for discovering this
issue and to Emmanuel Odeke (@odeke_et) for reporting it.
Fixes#50699
Fixes CVE-2022-23772
Change-Id: I590395a3d55689625390cf1e58f5f40623b26ee5
Reviewed-on: https://go-review.googlesource.com/c/go/+/379537
Trust: Katie Hockman <katie@golang.org>
Run-TryBot: Katie Hockman <katie@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Reviewed-by: Roland Shoemaker <roland@golang.org>
Reviewed-by: Julie Qiu <julie@golang.org>
Rat maintains the invariant that x.b.neg is always false,
but Rat.Denom was writing x.b.neg = false itself too.
That makes Rat.Denom a writing operation, when it should
be a read-only operation. That in turn makes it unsafe to
use from multiple goroutines, which is highly unexpected.
Make it read-only and therefore race-free again.
Fixes#50473.
Change-Id: I97b87913954511e5200c0665d16b9ed63422e505
Reviewed-on: https://go-review.googlesource.com/c/go/+/375935
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@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>
Change-Id: I2f3619aa827e18f356871511c20cf2c712f496b3
Reviewed-on: https://go-review.googlesource.com/c/go/+/353189
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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Trust: Keith Randall <khr@golang.org>
When these packages are released as part of Go 1.18,
Go 1.16 will no longer be supported, so we can remove
the +build tags in these files.
Ran go fix -fix=buildtag std cmd and then reverted the bootstrapDirs
as defined in src/cmd/dist/buildtool.go, which need to continue
to build with Go 1.4 for now.
Also reverted src/vendor and src/cmd/vendor, which will need
to be updated in their own repos first.
Manual changes in runtime/pprof/mprof_test.go to adjust line numbers.
For #41184.
Change-Id: Ic0f93f7091295b6abc76ed5cd6e6746e1280861e
Reviewed-on: https://go-review.googlesource.com/c/go/+/344955
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
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Reviewed-by: Bryan C. Mills <bcmills@google.com>
Minor leftover from CL 74851.
Change-Id: I1b56afcde3c505ba77a0f79e8ae9b01000362298
GitHub-Last-Rev: 87e97571a5
GitHub-Pull-Request: golang/go#48942
Reviewed-on: https://go-review.googlesource.com/c/go/+/355629
Reviewed-by: Robert Griesemer <gri@golang.org>
Trust: Daniel Martí <mvdan@mvdan.cc>
Trust: Alexander Rakoczy <alex@golang.org>
Change-Id: I0c2d26d6ede1452008992efbea7392162da65014
Reviewed-on: https://go-review.googlesource.com/c/go/+/331651
Reviewed-by: Robert Griesemer <gri@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
If someone sees "in [0,n)" it might look like a typo.
Saying "in the half-open interval [0,n)" will give people
something to search the web for (half-open interval).
Change-Id: I3c343f0a7171891e106e709ca77ab9db5daa5c84
Reviewed-on: https://go-review.googlesource.com/c/go/+/328210
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Run-TryBot: Russ Cox <rsc@golang.org>
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The comments in the code refer to Knuth and to Burnikel and Ziegler,
but Knuth's presentation is inscrutable, and our recursive division
code does not bear much resemblance to Burnikel and Ziegler's paper
(which is fine, ours is nicer).
Add a standalone explanation of division instead of referring to
difficult or not-directly-used references.
Change-Id: Ic1b35dc167fb29a69ee00e0b4a768ac9cc9e1324
Reviewed-on: https://go-review.googlesource.com/c/go/+/321078
Trust: Russ Cox <rsc@golang.org>
Trust: Katie Hockman <katie@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Katie Hockman <katie@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Code moved and functions reordered to be in a consistent
top-down dependency order, but otherwise unchanged.
First step toward commenting division algorithms.
Change-Id: Ib5e604fb5b2867edff3a228ba4e57b5cb32c4137
Reviewed-on: https://go-review.googlesource.com/c/go/+/321077
Trust: Russ Cox <rsc@golang.org>
Trust: Katie Hockman <katie@golang.org>
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
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Reviewed-by: Robert Griesemer <gri@golang.org>
Don't add them to files in vendor and cmd/vendor though. These will be
pulled in by updating the respective dependencies.
For #41184
Change-Id: Icc57458c9b3033c347124323f33084c85b224c70
Reviewed-on: https://go-review.googlesource.com/c/go/+/319389
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
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Reviewed-by: Russ Cox <rsc@golang.org>
Since we have int8 to int64 min max and uint8 to uint64 max constants,
we should probably have some for the word size types too. This change
also adds tests to validate the correctness of all integer limit
values.
Fixes#28538
Change-Id: Idd25782e98d16c2abedf39959b7b66e9c4c0c98b
Reviewed-on: https://go-review.googlesource.com/c/go/+/247058
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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The original value was rounded too early, which lead to the
surprising behavior that float64(math.SmallestNonzeroFloat64 / 2)
wasn't 0. That is, the exact compile-time computation of
math.SmallestNonzeroFloat64 / 2 resulted in a value that was
rounded up when converting to float64. To address this, added 3
more digits to the mantissa, ending in a 0.
While at it, also slightly increased the precision of MaxFloat64
to end in a 0.
Computed exact values via https://play.golang.org/p/yt4KTpIx_wP.
Added a test to verify expected behavior.
In contrast to the other (irrational) constants, expanding these
extreme values to more digits is unlikely to be important as they
are not going to appear in numeric computations except for tests
verifying their correctness (as is the case here).
Re-enabled a disabled test in go/types and types2.
Updates #44057.
Fixes#44058.
Change-Id: I8f363155e02331354e929beabe993c8d8de75646
Reviewed-on: https://go-review.googlesource.com/c/go/+/315170
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This CL adds a new flag to the testing package and the go test command
which randomizes the execution order for tests and benchmarks.
This can be useful for identifying unwanted dependencies
between test or benchmark functions.
The flag is off by default. If `-shuffle` is set to `on` then the system
clock will be used as the seed value. If `-shuffle` is set to an integer
N, then N will be used as the seed value. In both cases, the seed will
be reported for failed runs so that they can reproduced later on.
Fixes#28592
Change-Id: I62e7dfae5f63f97a0cbd7830ea844d9f7beac335
Reviewed-on: https://go-review.googlesource.com/c/go/+/310033
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Trust: Bryan C. Mills <bcmills@google.com>
Change-Id: Ibce07f8f36f7c64f7022ce656f8efbec5dff3f82
Reviewed-on: https://go-review.googlesource.com/c/go/+/313829
Reviewed-by: Robert Griesemer <gri@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Trust: Robert Griesemer <gri@golang.org>
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It is still a common misconception that math/rand can be used for
security-sensitive work if seeded with crypto/rand
(lazyledger/lazyledger-core#270). It can not.
Change-Id: I8598c352d1750eabeada50be9976ab68cbb42cc0
Reviewed-on: https://go-review.googlesource.com/c/go/+/310350
Trust: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Katie Hockman <katie@golang.org>
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Discovered by Junchen Li on CL 246858, the comparison before p and z are
swapped can be simplified from
pe < ze || (pe == ze && (pm1 < zm1 || (pm1 == zm1 && pm2 < zm2)))
to
pe < ze || pe == ze && pm1 < zm1
because zm2 is initialized to 0 before the branch.
Change-Id: Iee92d570038df2b0f8941ef6e422a022654ab2d6
Reviewed-on: https://go-review.googlesource.com/c/go/+/247241
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Reviewed-by: Keith Randall <khr@golang.org>
I don't know why the test requires runtime.(*Frame).Next symbol
present in the binary under test. I assume it is just some
sanity check? With CL 268479 runtime.(*Frame).Next can be pruned
by the linker. Replace it with runtime.main which should always
be present.
May fix the longtest builders.
Change-Id: Id3104c058b2786057ff58be41b1d35aeac2f3073
Reviewed-on: https://go-review.googlesource.com/c/go/+/304431
Trust: Cherry Zhang <cherryyz@google.com>
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Reviewed-by: Bryan C. Mills <bcmills@google.com>
Add generic rule to rewrite the single-precision square root expression
with one single-precision instruction. The optimization will reduce two
times of precision converting between double-precision and single-precision.
On arm64 flatform.
previous:
FCVTSD F0, F0
FSQRTD F0, F0
FCVTDS F0, F0
optimized:
FSQRTS S0, S0
And this patch adds the test case to check the correctness.
This patch refers to CL 241877, contributed by Alice Xu
(dianhong.xu@arm.com)
Change-Id: I6de5d02281c693017ac4bd4c10963dd55989bd7e
Reviewed-on: https://go-review.googlesource.com/c/go/+/276873
Trust: fannie zhang <Fannie.Zhang@arm.com>
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Make all our package sources use Go 1.17 gofmt format
(adding //go:build lines).
Part of //go:build change (#41184).
See https://golang.org/design/draft-gobuild
Change-Id: Ia0534360e4957e58cd9a18429c39d0e32a6addb4
Reviewed-on: https://go-review.googlesource.com/c/go/+/294430
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
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Reviewed-by: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
The Surface Pro X's 386 simulator is not completely faithful to a real 387.
The most egregious problem is that it computes Log2(8) as 2.9999999999999996,
but it has some other subtler problems as well. All the problems occur in
routines that we don't even bother with assembly for on amd64.
If the speed of Go code is OK on amd64 it should be OK on 386 too.
Just remove all the 386-only assembly functions.
This leaves Ceil, Floor, Trunc, Hypot, and Sqrt in 386 assembly,
all of which are also in assembly on amd64 and all of which pass
their tests on Surface Pro X.
Compared to amd64, the 386 port omits assembly for Min, Max, and Log.
It never had Min and Max, and this CL deletes Log because Log2 wasn't
even correct. (None of the other architectures have assembly Log either.)
Change-Id: I5eb6c61084467035269d4098a36001447b7a0601
Reviewed-on: https://go-review.googlesource.com/c/go/+/291229
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
There appears to be a typo in the description of
the recursive division algorithm.
Two things seem suspicious with the original comment:
1. It is talking about choosing s, but s doesn't
appear anywhere in the equation.
2. The math in the equation is incorrect.
Where
B = len(v)/2
s = B - 1
Proof that it is incorrect:
len(v) - B >= B + 1
len(v) - len(v)/2 >= len(v)/2 + 1
This doesn't hold if len(v) is even, e.g. 10:
10 - 10/2 >= 10/2 + 1
10 - 5 >= 5 + 1
5 >= 6 // this is false
The new equation will be the following,
which will be mathematically correct:
len(v) - s >= B + 1
len(v) - (len(v)/2 - 1) >= len(v)/2 + 1
len(v) - len(v)/2 + 1 >= len(v)/2 + 1
len(v) - len(v)/2 >= len(v)/2
This holds if len(v) is even or odd.
e.g. 10
10 - 10/2 >= 10/2
10 - 5 >= 5
5 >= 5
e.g. 11
11 - 11/2 >= 11/2
11 - 5 >= 5
6 >= 5
Change-Id: If77ce09286cf7038637b5dfd0fb7d4f828023f56
Reviewed-on: https://go-review.googlesource.com/c/go/+/287372
Run-TryBot: Katie Hockman <katie@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Trust: Katie Hockman <katie@golang.org>
"it does not necessary" -> "it is not necessary"
Change-Id: I66f9cf2670d76b3686badb4a537b3ec084447d62
GitHub-Last-Rev: 52a0f9993a
GitHub-Pull-Request: golang/go#43935
Reviewed-on: https://go-review.googlesource.com/c/go/+/287052
Reviewed-by: Robert Griesemer <gri@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Robert Griesemer <gri@golang.org>
The vulnerability that allowed this panic is
CVE-2020-28362 and has been fixed in a security
release, per #42552.
Change-Id: I774bcda2cc83cdd5a273d21c8d9f4b53fa17c88f
Reviewed-on: https://go-review.googlesource.com/c/go/+/277959
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Reviewed-by: Filippo Valsorda <filippo@golang.org>
As part of #42026, these helpers from io/ioutil were moved to os.
(ioutil.TempFile and TempDir became os.CreateTemp and MkdirTemp.)
Update the Go tree to use the preferred names.
As usual, code compiled with the Go 1.4 bootstrap toolchain
and code vendored from other sources is excluded.
ReadDir changes are in a separate CL, because they are not a
simple search and replace.
For #42026.
Change-Id: If318df0216d57e95ea0c4093b89f65e5b0ababb3
Reviewed-on: https://go-review.googlesource.com/c/go/+/266365
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cui fliter
Daniel Martí
Michael Pratt
Akhil Indurti
Than McIntosh
Valentin Deleplace
Rob Pike
Ian Lance Taylor
Filippo Valsorda
Alan Donovan
Dmitry Panov
Alexander Yastrebov
Russ Cox
ruinan
Eric Lagergren
Lynn Boger
Riccardo Gerosa
hopehook
Nick Craig-Wood
eric fang
Shulhan
Alok Menghrajani
Jonathan FOng
Wayne Zuo
Cuong Manh Le
Keith Randall
Roland Shoemaker
Xiaodong Liu
Ryan Leung
Nathan VanBenschoten
Chressie Himpel
Joe Tsai
Archana R
Lasse Folger
Nicolas Hillegeer
David Chase
Dan Kortschak
cuiweixie
Katie Hockman
Pedro Lopez Mareque
andig
Robert Griesemer
Yasuhiro Matsumoto
tkawakita
Tobias Klauser
Colin Arnott
Paschalis Tsilias
yangwenmai
Yury Smolsky
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