Commit Graph

62808 Commits

Author SHA1 Message Date
Alex S 57508059e8 encoding/json: correct method comment to reflect actual argument
Change-Id: I0e9040ee5b84463f0391e8e4ae1b64a036867913
GitHub-Last-Rev: 859c82a254
GitHub-Pull-Request: golang/go#73123
Reviewed-on: https://go-review.googlesource.com/c/go/+/662015
Auto-Submit: Sean Liao <sean@liao.dev>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Sean Liao <sean@liao.dev>
2025-04-15 04:38:58 -07:00
Dmitrii Martynov e0dba45c62 runtime: size field for gQueue and gList
Before CL, all instances of gQueue and gList stored the size of
structures in a separate variable. The size changed manually and passed
as a separate argument to different functions. This CL added an
additional field to gQueue and gList structures to store the size. Also,
the calculation of size was moved into the implementation of API for
these structures. This allows to reduce possible errors by eliminating
manual calculation of the size and simplifying functions' signatures.

Change-Id: I087da2dfaec4925e4254ad40fce5ccb4c175ec41
Reviewed-on: https://go-review.googlesource.com/c/go/+/664777
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Auto-Submit: Keith Randall <khr@golang.org>
2025-04-15 02:33:12 -07:00
Achille Roussel ba7b8ca336 iter: reduce memory footprint of iter.Pull functions
The implementation of iter.Pull and iter.Pull2 functions is based on
closures and sharing local state, which results in one heap allocation
for each captured variable.

The number of heap allocations can be reduced by grouping the state
shared between closures in a struct, allowing the compiler to allocate
all local variables in a single heap region instead of creating
individual heap objects for each variable.

This approach can sometimes have downsides when it couples unrelated
objects in a single memory region, preventing the garbage collector from
reclaiming unused memory. While technically only a subset of the local
state is shared between the next and stop functions, it seems unlikely
that retaining the rest of the state until stop is reclaimed would be
problematic in practice, since the two closures would often have very
similar lifetimes.

The change also reduces the total memory footprint due to alignment
rules, the two booleans can be packed in memory and sometimes can even
exist within the padding space of the v value. There is also less
metadata needed for the garbage collector to track each individual heap
allocation.

goos: darwin
goarch: arm64
pkg: iter
cpu: Apple M2 Pro
         │ /tmp/bench.old │           /tmp/bench.new            │
         │     sec/op     │   sec/op     vs base                │
Pull-12       218.6n ± 7%   146.1n ± 0%  -33.19% (p=0.000 n=10)
Pull2-12      239.8n ± 5%   155.0n ± 5%  -35.36% (p=0.000 n=10)
geomean       229.0n        150.5n       -34.28%

         │ /tmp/bench.old │           /tmp/bench.new           │
         │      B/op      │    B/op     vs base                │
Pull-12        288.0 ± 0%   176.0 ± 0%  -38.89% (p=0.000 n=10)
Pull2-12       312.0 ± 0%   176.0 ± 0%  -43.59% (p=0.000 n=10)
geomean        299.8        176.0       -41.29%

         │ /tmp/bench.old │           /tmp/bench.new           │
         │   allocs/op    │ allocs/op   vs base                │
Pull-12       11.000 ± 0%   5.000 ± 0%  -54.55% (p=0.000 n=10)
Pull2-12      12.000 ± 0%   5.000 ± 0%  -58.33% (p=0.000 n=10)
geomean        11.49        5.000       -56.48%

Change-Id: Iccbe233e8ae11066087ffa4781b66489d0d410a7
Reviewed-on: https://go-review.googlesource.com/c/go/+/552375
Reviewed-by: Sean Liao <sean@liao.dev>
Auto-Submit: Sean Liao <sean@liao.dev>
Reviewed-by: qiu laidongfeng2 <2645477756@qq.com>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
2025-04-14 15:10:49 -07:00
fanzha02 adf21a9b56 internal/cpu: add a detection for Neoverse(N3, V3, V3ae) cores
The memmove implementation relies on the variable
runtime.arm64UseAlignedLoads to select fastest code
path. Considering Neoverse N3, V3 and V3ae cores
prefer aligned loads, this patch adds code to detect
them for memmove performance.

Change-Id: I7266fc35d8b2c15ff516c592b987bafacb82b620
Reviewed-on: https://go-review.googlesource.com/c/go/+/664038
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@google.com>
2025-04-14 09:26:16 -07:00
Keith Randall e278a789b6 path: add Join benchmark
This is a case where CL 653856 saves an allocation.

        │     old     │                 new                 │
        │   sec/op    │   sec/op     vs base                │
Join-24   73.57n ± 1%   60.27n ± 1%  -18.07% (p=0.000 n=10)

        │    old     │                new                 │
        │    B/op    │    B/op     vs base                │
Join-24   48.00 ± 0%   24.00 ± 0%  -50.00% (p=0.000 n=10)

        │    old     │                new                 │
        │ allocs/op  │ allocs/op   vs base                │
Join-24   2.000 ± 0%   1.000 ± 0%  -50.00% (p=0.000 n=10)

Change-Id: I56308262ca73a7ab9698b54fd8681f5b44626995
Reviewed-on: https://go-review.googlesource.com/c/go/+/665075
Reviewed-by: Keith Randall <khr@google.com>
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2025-04-14 08:06:30 -07:00
dmathieu 80bff42fdd errors: optimize errors.Join for single unwrappable errors
Change-Id: I10bbb782ca7234cda8c82353f2255eec5be588c9
GitHub-Last-Rev: e5ad8fdb80
GitHub-Pull-Request: golang/go#70770
Reviewed-on: https://go-review.googlesource.com/c/go/+/635115
Auto-Submit: Sean Liao <sean@liao.dev>
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Sean Liao <sean@liao.dev>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
2025-04-14 06:49:08 -07:00
James Tucker 0c0d257241 internal/poll: disable SIO_UDP_NETRESET on Windows
Disable the reception of NET_UNREACHABLE (TTL expired) message reporting
on UDP sockets to match the default behavior of sockets on other
plaforms.

See https://learn.microsoft.com/en-us/windows/win32/winsock/winsock-ioctls#sio_udp_netreset

This is similar to, but a different case from the prior change 3114bd6 /
https://golang.org/issue/5834 that disabled one of the two flags
influencing behavior in response to the reception of related ICMP.

Updates #5834
Updates #68614

Change-Id: I39bc77ab68f5edfc14514d78870ff4a24c0f645e
GitHub-Last-Rev: 78f073bac2
GitHub-Pull-Request: golang/go#68615
Reviewed-on: https://go-review.googlesource.com/c/go/+/601397
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Reviewed-by: Michael Pratt <mpratt@google.com>
Auto-Submit: Michael Pratt <mpratt@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Quim Muntal <quimmuntal@gmail.com>
2025-04-14 05:51:58 -07:00
qmuntal f414dfe4f5 os,internal/poll: support I/O on overlapped files not added to the poller
This fixes the support for I/O on overlapped files that are not added to
the poller. Note that CL 661795 already added support for that, but it
really only worked for pipes, not for plain files.

Additionally, this CL also makes this kind of I/O operations to not
notify the external poller to avoid confusing it.

Updates #15388.

Change-Id: I15c6ea74f3a87960aef0986598077b6eab9b9c99
Reviewed-on: https://go-review.googlesource.com/c/go/+/664415
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Reviewed-by: Damien Neil <dneil@google.com>
Auto-Submit: Quim Muntal <quimmuntal@gmail.com>
2025-04-14 05:40:53 -07:00
Guoqi Chen 13b7c7d8d2 runtime: optimize the function memmove using SIMD on loong64
goos: linux
goarch: loong64
pkg: runtime
cpu: Loongson-3A6000 @ 2500.00MHz
                                 |  bench.old   |            bench.new                |
                                 |    sec/op    |   sec/op     vs base                |
Memmove/256                        10.215n ± 0%   6.407n ± 0%  -37.28% (p=0.000 n=10)
Memmove/512                        16.940n ± 0%   8.694n ± 0%  -48.68% (p=0.000 n=10)
Memmove/1024                        29.64n ± 0%   15.22n ± 0%  -48.65% (p=0.000 n=10)
Memmove/2048                        55.42n ± 0%   28.03n ± 0%  -49.43% (p=0.000 n=10)
Memmove/4096                       106.55n ± 0%   53.65n ± 0%  -49.65% (p=0.000 n=10)
MemmoveOverlap/256                  11.01n ± 0%   10.84n ± 0%   -1.54% (p=0.000 n=10)
MemmoveOverlap/512                  17.41n ± 0%   15.09n ± 0%  -13.35% (p=0.000 n=10)
MemmoveOverlap/1024                 30.23n ± 0%   28.70n ± 0%   -5.08% (p=0.000 n=10)
MemmoveOverlap/2048                 55.87n ± 0%   42.84n ± 0%  -23.32% (p=0.000 n=10)
MemmoveOverlap/4096                107.10n ± 0%   87.90n ± 0%  -17.93% (p=0.000 n=10)
MemmoveUnalignedDst/256            16.665n ± 1%   9.611n ± 0%  -42.33% (p=0.000 n=10)
MemmoveUnalignedDst/512             24.75n ± 0%   11.81n ± 0%  -52.29% (p=0.000 n=10)
MemmoveUnalignedDst/1024            43.25n ± 0%   20.46n ± 1%  -52.68% (p=0.000 n=10)
MemmoveUnalignedDst/2048            75.68n ± 0%   39.64n ± 0%  -47.61% (p=0.000 n=10)
MemmoveUnalignedDst/4096           152.75n ± 0%   80.08n ± 0%  -47.57% (p=0.000 n=10)
MemmoveUnalignedDstOverlap/256      11.88n ± 1%   10.95n ± 0%   -7.83% (p=0.000 n=10)
MemmoveUnalignedDstOverlap/512      19.71n ± 0%   16.20n ± 0%  -17.83% (p=0.000 n=10)
MemmoveUnalignedDstOverlap/1024     39.84n ± 0%   28.74n ± 0%  -27.86% (p=0.000 n=10)
MemmoveUnalignedDstOverlap/2048     81.12n ± 0%   40.11n ± 0%  -50.56% (p=0.000 n=10)
MemmoveUnalignedDstOverlap/4096    166.20n ± 0%   85.11n ± 0%  -48.79% (p=0.000 n=10)
MemmoveUnalignedSrc/256            10.945n ± 1%   6.807n ± 0%  -37.81% (p=0.000 n=10)
MemmoveUnalignedSrc/512             19.33n ± 4%   11.01n ± 1%  -43.02% (p=0.000 n=10)
MemmoveUnalignedSrc/1024            34.74n ± 0%   19.69n ± 0%  -43.32% (p=0.000 n=10)
MemmoveUnalignedSrc/2048            65.98n ± 0%   39.79n ± 0%  -39.69% (p=0.000 n=10)
MemmoveUnalignedSrc/4096           126.00n ± 0%   81.31n ± 0%  -35.47% (p=0.000 n=10)
MemmoveUnalignedSrcDst/f_256_0     13.610n ± 0%   7.608n ± 0%  -44.10% (p=0.000 n=10)
MemmoveUnalignedSrcDst/b_256_0      12.81n ± 0%   10.94n ± 0%  -14.60% (p=0.000 n=10)
MemmoveUnalignedSrcDst/f_256_1      17.17n ± 0%   10.01n ± 0%  -41.70% (p=0.000 n=10)
MemmoveUnalignedSrcDst/b_256_1      17.62n ± 0%   11.21n ± 0%  -36.38% (p=0.000 n=10)
MemmoveUnalignedSrcDst/f_256_4      16.22n ± 0%   10.01n ± 0%  -38.29% (p=0.000 n=10)
MemmoveUnalignedSrcDst/b_256_4      16.42n ± 0%   11.21n ± 0%  -31.73% (p=0.000 n=10)
MemmoveUnalignedSrcDst/f_256_7      14.09n ± 0%   10.79n ± 0%  -23.39% (p=0.000 n=10)
MemmoveUnalignedSrcDst/b_256_7      14.82n ± 0%   11.21n ± 0%  -24.36% (p=0.000 n=10)
MemmoveUnalignedSrcDst/f_4096_0    109.80n ± 0%   75.07n ± 0%  -31.63% (p=0.000 n=10)
MemmoveUnalignedSrcDst/b_4096_0    108.90n ± 0%   78.48n ± 0%  -27.93% (p=0.000 n=10)
MemmoveUnalignedSrcDst/f_4096_1    113.60n ± 0%   78.88n ± 0%  -30.56% (p=0.000 n=10)
MemmoveUnalignedSrcDst/b_4096_1    113.80n ± 0%   80.56n ± 0%  -29.20% (p=0.000 n=10)
MemmoveUnalignedSrcDst/f_4096_4    112.30n ± 0%   80.35n ± 0%  -28.45% (p=0.000 n=10)
MemmoveUnalignedSrcDst/b_4096_4    113.80n ± 1%   80.58n ± 0%  -29.19% (p=0.000 n=10)
MemmoveUnalignedSrcDst/f_4096_7    110.70n ± 0%   79.68n ± 0%  -28.02% (p=0.000 n=10)
MemmoveUnalignedSrcDst/b_4096_7    111.10n ± 0%   80.58n ± 0%  -27.47% (p=0.000 n=10)
MemmoveUnalignedSrcDst/f_65536_0    4.669µ ± 0%   2.680µ ± 0%  -42.60% (p=0.000 n=10)
MemmoveUnalignedSrcDst/b_65536_0    5.083µ ± 0%   2.672µ ± 0%  -47.43% (p=0.000 n=10)
MemmoveUnalignedSrcDst/f_65536_1    4.716µ ± 0%   2.677µ ± 0%  -43.24% (p=0.000 n=10)
MemmoveUnalignedSrcDst/b_65536_1    4.611µ ± 0%   2.672µ ± 0%  -42.05% (p=0.000 n=10)
MemmoveUnalignedSrcDst/f_65536_4    4.718µ ± 0%   2.678µ ± 0%  -43.24% (p=0.000 n=10)
MemmoveUnalignedSrcDst/b_65536_4    4.610µ ± 0%   2.673µ ± 0%  -42.01% (p=0.000 n=10)
MemmoveUnalignedSrcDst/f_65536_7    4.724µ ± 0%   2.678µ ± 0%  -43.31% (p=0.000 n=10)
MemmoveUnalignedSrcDst/b_65536_7    4.611µ ± 0%   2.673µ ± 0%  -42.03% (p=0.000 n=10)
MemmoveUnalignedSrcOverlap/256      13.62n ± 0%   11.97n ± 0%  -12.11% (p=0.000 n=10)
MemmoveUnalignedSrcOverlap/512      23.96n ± 0%   16.20n ± 0%  -32.39% (p=0.000 n=10)
MemmoveUnalignedSrcOverlap/1024     43.95n ± 0%   30.25n ± 0%  -31.18% (p=0.000 n=10)
MemmoveUnalignedSrcOverlap/2048     84.29n ± 0%   42.27n ± 0%  -49.85% (p=0.000 n=10)
MemmoveUnalignedSrcOverlap/4096    170.50n ± 0%   85.47n ± 0%  -49.87% (p=0.000 n=10)

Change-Id: Id1c3fbfed049d9a665f05f7c1af84e9fbd45fddf
Reviewed-on: https://go-review.googlesource.com/c/go/+/663395
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Meidan Li <limeidan@loongson.cn>
2025-04-13 20:20:58 -07:00
Than McIntosh 47ab9cbd82 cmd: fix DWARF gen bug with packages that use assembly
When the compiler builds a Go package with DWARF 5 generation enabled,
it emits relocations into various generated DWARF symbols (ex:
SDWARFFCN) that use the R_DWTXTADDR_* flavor of relocations. The
specific size of this relocation is selected based on the total number
of functions in the package -- if the package is tiny (just a couple
funcs) we can use R_DWTXTADDR_U1 relocs (which target just a byte); if
the package is larger we might need to use the 2-byte or 3-byte flavor
of this reloc.

Prior to this patch, the strategy used to pick the right relocation
size was flawed in that it didn't take into account packages with
assembly code. For example, if you have a package P with 200 funcs
written in Go source and 200 funcs written in assembly, you can't use
the R_DWTXTADDR_U1 reloc flavor for indirect text references since the
real function count for the package (asm + go) exceeds 255.

The new strategy (with this patch) is to have the compiler look at the
"symabis" file to determine the count of assembly functions. For the
assembler, rather than create additional plumbing to pass in the Go
source func count we just use an dummy (artificially high) function
count so as to select a relocation that will be large enough.

Fixes #72810.
Updates #26379.

Change-Id: I98d04f3c6aacca1dafe1f1610c99c77db290d1d8
Reviewed-on: https://go-review.googlesource.com/c/go/+/663235
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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Reviewed-by: David Chase <drchase@google.com>
2025-04-13 08:09:12 -07:00
Keith Randall 21acfdc4ef cmd/compile: turn off variable-sized make() stack allocation with -N
Give people a way to turn this optimization off.

(Currently the constant-sized make() stack allocation is not disabled
with -N. Kinda inconsistent, but oh well, probably worse to change it now.)

Update #73253

Change-Id: Idb9ffde444f34e70673147fd6a962368904a7a55
Reviewed-on: https://go-review.googlesource.com/c/go/+/664655
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Jorropo <jorropo.pgm@gmail.com>
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2025-04-11 17:18:12 -07:00
Marcel Meyer 03640f688b all: use built-in min, max functions
Change-Id: Ie76ebb556d635068342747f3f91dd7dc423df531
GitHub-Last-Rev: aea61fb3a0
GitHub-Pull-Request: golang/go#73340
Reviewed-on: https://go-review.googlesource.com/c/go/+/664677
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Reviewed-by: Keith Randall <khr@google.com>
2025-04-11 16:00:30 -07:00
Marcel Meyer 56fad21c22 cmd/compile/internal/ssa: small cleanups
Change-Id: I0420fb3956577c56fa24a31929331d526d480556
GitHub-Last-Rev: d74b0d4d75
GitHub-Pull-Request: golang/go#73339
Reviewed-on: https://go-review.googlesource.com/c/go/+/664975
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
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2025-04-11 15:58:07 -07:00
Tobias Klauser f967078712 os: fix TestRootChtimes on illumos
TestRootChtimes currently fails on illumos [1] because the times
returned by os.Stat have only microsecond precision on that builder.
Truncate them to make the test pass again.

[1] https://build.golang.org/log/9780af24c3b3073dae1d827b2b9f9e3a48912c30

Change-Id: I8cf895d0b60c854c27cb4faf57c3b44bd40bfdd4
Reviewed-on: https://go-review.googlesource.com/c/go/+/664915
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
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2025-04-11 13:20:16 -07:00
Russ Cox 3968a5bca4 runtime: handle m0 padding better
The SpinbitMutex experiment requires m structs other than m0
to be allocated in 2048-byte size class, by adding padding.
Do the calculation more explicitly, to avoid future CLs like CL 653335.

Change-Id: I83ae1e86ef3711ab65441f4e487f94b9e1429029
Reviewed-on: https://go-review.googlesource.com/c/go/+/654595
Reviewed-by: Rhys Hiltner <rhys.hiltner@gmail.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
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2025-04-11 12:24:59 -07:00
Marcel Meyer c77ada1b78 cmd/compile/internal/ssa: simplify with built-in min, max functions
Change-Id: I08fa2940cd3565c578b1b323656a4fa12e0c65bb
GitHub-Last-Rev: 1f673b190e
GitHub-Pull-Request: golang/go#73322
Reviewed-on: https://go-review.googlesource.com/c/go/+/664675
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2025-04-11 08:50:53 -07:00
Marcel Meyer bbf4d57c22 cmd/compile/internal/ssa: use built-in min, max function
Change-Id: I6dd6e3f8a581931fcea3c3e0ac30ce450253e1d8
GitHub-Last-Rev: c476f8b9a3
GitHub-Pull-Request: golang/go#73318
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2025-04-11 08:31:00 -07:00
Marcel Meyer c3a0859720 runtime: use built-in min function
Change-Id: I625c392864c97cefc2ac8f23612e3f62f7fbba23
GitHub-Last-Rev: 779f756850
GitHub-Pull-Request: golang/go#73313
Reviewed-on: https://go-review.googlesource.com/c/go/+/664016
Reviewed-by: Keith Randall <khr@golang.org>
Auto-Submit: Keith Randall <khr@golang.org>
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Reviewed-by: Keith Randall <khr@google.com>
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2025-04-11 08:22:09 -07:00
1911860538 5c2c1cde9c time: remove redundant int conversion in tzruleTime
daysBefore returns int.

Change-Id: Ib30c9ea76b46178a4fc35e8198aaab913329ceba
GitHub-Last-Rev: 2999e99dad
GitHub-Pull-Request: golang/go#73182
Reviewed-on: https://go-review.googlesource.com/c/go/+/663275
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Reviewed-by: Sean Liao <sean@liao.dev>
2025-04-11 07:30:57 -07:00
Russ Cox 432fd9c60f math/big: remove copy responsibility from, rename shlVU, shrVU
It is annoying that non-x86 implementations of shlVU and shrVU
have to go out of their way to handle the trivial case shift==0
with their own copy loops. Instead, arrange to never call them
with shift==0, so that the code can be removed.

Unfortunately, there are linknames of shlVU, so we cannot
change that function. But we can rename the functions and
then leave behind a shlVU wrapper, so do that.

Since the big.Int API calls the operations Lsh and Rsh, rename
shlVU/shrVU to lshVU/rshVU. Also rename various other shl/shr
methods and functions to lsh/rsh.

Change-Id: Ieaf54e0110a298730aa3e4566ce5be57ba7fc121
Reviewed-on: https://go-review.googlesource.com/c/go/+/664896
Reviewed-by: Alan Donovan <adonovan@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
2025-04-11 06:03:38 -07:00
Russ Cox 4dffdd797b math/big: replace addMulVVW with addMulVVWW
addMulVVW is an unnecessarily special case.
All other assembly routines taking []Word (V as in vector) arguments
take separate source and destination. For example:

	addVV: z = x+y
	mulAddVWW: z = x*m+a

addMulVVW uses the z parameter as both destination and source:

	addMulVVW: z = z+x*m

Even looking at the signatures is confusing: all the VV routines take
two input vectors x and y, but addMulVVW takes only x: where is y?
(The answer is that the two inputs are z and x.)

It would be nice to fix this, both for understandability and regularity,
and to simplify a future assembly generator.

We cannot remove or redefine addMulVVW, because it has been used
in linknames. Instead, the CL adds a new final addend argument ‘a’
like in mulAddVWW, making the natural name addMulVVWW
(two input vectors, two input words):

	addMulVVWW: z = x+y*m+a

This CL updates all the assembly implementations to rename the
inputs z, x, y -> x, y, m, and then introduces a separate destination z.

Change-Id: Ib76c80b53f6d1f4a901f663566e9c4764bb20488
Reviewed-on: https://go-review.googlesource.com/c/go/+/664895
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Reviewed-by: Alan Donovan <adonovan@google.com>
2025-04-11 05:42:18 -07:00
Marcel Meyer 037112464b cmd/compile/internal/ssa: use built-in min function
Change-Id: Id4276adea58afdf98c6f9b547cca0546fc659ae1
GitHub-Last-Rev: 4c836241c8
GitHub-Pull-Request: golang/go#73323
Reviewed-on: https://go-review.googlesource.com/c/go/+/664695
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2025-04-10 16:38:29 -07:00
Marcel Meyer 9d915d6870 cmd/compile/internal/ssa: remove unused round function
Change-Id: I15ee74ab0be0cd996a74e6233b39e0953da3f327
GitHub-Last-Rev: dc41b1027a
GitHub-Pull-Request: golang/go#73324
Reviewed-on: https://go-review.googlesource.com/c/go/+/664696
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Auto-Submit: Dmitri Shuralyov <dmitshur@google.com>
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2025-04-10 16:37:57 -07:00
Sam Thanawalla 835e36fc7f cmd/go: add subdirectory support to go-import meta tag
This CL adds ability to specify a subdirectory in the go-import meta tag.
A go-import meta tag now will support:
<meta name="go-import" content="root-path vcs repo-url subdir">

Fixes: #34055
Cq-Include-Trybots: luci.golang.try:gotip-linux-amd64-longtest,gotip-windows-amd64-longtest
Change-Id: Iedac520f97e0646254cc1bd2f97d5a9a5236829b
Reviewed-on: https://go-review.googlesource.com/c/go/+/625577
Reviewed-by: Michael Matloob <matloob@golang.org>
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2025-04-10 11:14:09 -07:00
qmuntal 2c35900fe4 net: deduplicate sendfile files
The sendfile implementation for platforms supporting it is now in
net/sendfile.go, rather than being duplicated in separate files for
each platform.

The only difference between the implementations was the poll.SendFile
parameters, which have been harmonized, and also linux strictly
asserting for os.File, which now have been relaxed to allow any
type implementing syscall.Conn.

Change-Id: Ia1a2d5ee7380710a36fc555dbf681f7e996ea2ec
Reviewed-on: https://go-review.googlesource.com/c/go/+/664075
Reviewed-by: Damien Neil <dneil@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Quim Muntal <quimmuntal@gmail.com>
2025-04-10 09:12:09 -07:00
qmuntal 9aad012a6e net: reenable sendfile on Windows
Windows sendfile optimization is skipped since CL 472475, which started
passing an os.fileWithoutWriteTo instead of an os.File to sendfile,
and that function was only implemented for os.File.

This CL fixes the issue by asserting against an interface rather than
a concrete type.

Some tests have been reenabled, triggering bugs in poll.SendFile which
have been fixed in this CL.

Fixes #67042.

Cq-Include-Trybots: luci.golang.try:gotip-windows-amd64-longtest
Change-Id: Id6f7a0e1e0f34a72216fa9d00c5bf36f5a994219
Reviewed-on: https://go-review.googlesource.com/c/go/+/664055
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
2025-04-10 07:36:41 -07:00
Zxilly d60a684c87 cmd/internal/obj/wasm: use i64 for large return addr
Use i64 to avoid overflow when getting PC_F from the return addr.

Fixes #73246

Change-Id: I5683dccf7eada4b8536edf53e2e83116a2f6d943
GitHub-Last-Rev: 267d9a1a03
GitHub-Pull-Request: golang/go#73277
Reviewed-on: https://go-review.googlesource.com/c/go/+/663995
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Reviewed-by: Cherry Mui <cherryyz@google.com>
2025-04-09 23:38:23 -07:00
1911860538 7a82b6a9e1 net/http: initialize Value with File length in cloneMultipartForm
Improve the initialization of the Value map in cloneMultipartForm by
utilizing the length of the File map to optimize memory allocation.

Change-Id: I97ba9e19b2718a75c270e6df21306f4c82656c71
GitHub-Last-Rev: a9683ba9a7
GitHub-Pull-Request: golang/go#69943
Reviewed-on: https://go-review.googlesource.com/c/go/+/621235
Reviewed-by: Christian Ekrem <christianekrem@gmail.com>
Reviewed-by: Sean Liao <sean@liao.dev>
Reviewed-by: qiu laidongfeng2 <2645477756@qq.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Damien Neil <dneil@google.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
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2025-04-09 17:04:40 -07:00
Dmitrii Martynov a42e337ede runtime: explicitly exclude a potential deadlock in the scheduler
The following sequence in the scheduler may potentially lead to
deadlock:
- globrunqget() -> runqput() -> runqputslow() -> globrunqputbatch()
However, according to the current logic of the scheduler it is not
possible to face the deadlock.

The patch explicitly excludes the deadlock, even though it is impossible
situation at the moment.

Additionally, the "runq" and "globrunq" APIs were partially refactored,
which allowed to minimize the usage of these APIs by each other.
This will prevent situations described in the CL.

Change-Id: I7318f935d285b95522998e0903eaa6193af2ba48
Reviewed-on: https://go-review.googlesource.com/c/go/+/662216
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
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2025-04-09 16:12:45 -07:00
qiulaidongfeng 8898450841 cmd/go: only print GOCACHE value in env -changed if it's not the default
When other environment variables are set to default values,
we will not print it in go env -changed,
GOCACHE should do the same.

For #69994

Change-Id: I16661803cf1f56dd132b4db1c2d5cb4823fc0e58
Reviewed-on: https://go-review.googlesource.com/c/go/+/621997
Reviewed-by: Sean Liao <sean@liao.dev>
Auto-Submit: Sean Liao <sean@liao.dev>
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2025-04-09 13:56:45 -07:00
thepudds 4820816b0d cmd/go/internal/modcmd: remove documentation for auto-converting legacy formats
CL 518776 dropped the ability of 'go mod init' to convert
legacy pre-module dependency configuration files, such as automatically
transforming a Gopkg.lock to a go.mod file with similar requirements,
but some of the documentation remained.

In this CL, we remove it from the cmd/go documentation.
(CL 662675 is a companion change that removes it from the Modules
Reference page).

Updates #71537

Change-Id: Ieccc64c811c4c25a657c00e42f7362a32b5fd661
Reviewed-on: https://go-review.googlesource.com/c/go/+/662695
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2025-04-09 13:53:22 -07:00
Jakob Ackermann cfb78d63bd net/http: reduce memory usage when hijacking
Previously, Hijack allocated a new write buffer and the existing
connection write buffer used an extra 4KiB of memory until the handler
finished and the "conn" was garbage collected. Now, hijack re-uses the
existing write buffer and re-attaches it to the raw connection to avoid
referencing the net/http "conn" after returning.

After a handler that hijacked exited, the "conn" reference in
"connReader" will now be unset. This allows all of the "conn",
"response" and "Request" to get garbage collected.
Overall, this is reducing the memory usage by 43% or 6.7KiB per hijacked
connection (see BenchmarkServerHijackMemoryUsage in an earlier revision
of the CL).

CloseNotify will continue to work _before_ the handler has exited
(i.e. while the "conn" is still referenced in "connReader"). This aligns
with the documentation of CloseNotifier:
> After the Handler has returned, there is no guarantee that the channel
> receives a value.

goos: linux
goarch: amd64
pkg: net/http
cpu: Intel(R) Core(TM) i7-8550U CPU @ 1.80GHz
               │   before    │             after              │
               │   sec/op    │    sec/op     vs base          │
ServerHijack-8   42.59µ ± 8%   39.47µ ± 16%  ~ (p=0.481 n=10)

               │    before    │                after                 │
               │     B/op     │     B/op      vs base                │
ServerHijack-8   16.12Ki ± 0%   12.06Ki ± 0%  -25.16% (p=0.000 n=10)

               │   before   │               after               │
               │ allocs/op  │ allocs/op   vs base               │
ServerHijack-8   51.00 ± 0%   49.00 ± 0%  -3.92% (p=0.000 n=10)

Change-Id: I20a37ee314ed0d47463a4657d712154e78e48138
GitHub-Last-Rev: 80f09dfa27
GitHub-Pull-Request: golang/go#70756
Reviewed-on: https://go-review.googlesource.com/c/go/+/634855
Reviewed-by: Sean Liao <sean@liao.dev>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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2025-04-09 13:49:52 -07:00
qmuntal cac276f81a internal/poll: fix race in Close
There is a potential race between a concurrent call to FD.initIO, which
calls FD.pd.init, and a call to FD.Close, which calls FD.pd.evict.

This is solved by calling FD.initIO in FD.Close, as that will block
until the concurrent FD.initIO has completed. Note that FD.initIO is
no-op if first called from here.

The race window is so small that it is not possible to write a test
that triggers it.

Change-Id: Ie2f2818e746b9d626fe3b9eb6b8ff967c81ef863
Reviewed-on: https://go-review.googlesource.com/c/go/+/663815
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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Reviewed-by: Damien Neil <dneil@google.com>
2025-04-09 13:07:09 -07:00
qmuntal 7007dfcd0c os: clean-up NewFile tests
This CL removes some unnecessary code and duplicated NewFile tests
cases.

It also simplifies TestPipeCanceled by removing the need for using
SetReadDeadline. Using CancelIoEx instead of CancelIo makes the cancel
operations to finish almost instantly. The latter could take more than
20s to finish if called from a thread different from the one that
called ReadFile.

Change-Id: I9033cbcad277666bc2aec89b3e5a3ef529da2cd8
Reviewed-on: https://go-review.googlesource.com/c/go/+/663755
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
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2025-04-09 13:06:17 -07:00
limeidan 09d76e59d2 cmd/compile: set unalignedOK to make memcombine work properly on loong64
goos: linux
goarch: loong64
pkg: unicode/utf8
cpu: Loongson-3A6000-HV @ 2500.00MHz
                            │     old     │                 new                 │
                            │   sec/op    │   sec/op     vs base                │
ValidTenASCIIChars            7.604n ± 0%   6.805n ± 0%  -10.51% (p=0.000 n=10)
Valid100KASCIIChars           37.41µ ± 0%   16.58µ ± 0%  -55.67% (p=0.000 n=10)
ValidTenJapaneseChars         60.84n ± 0%   58.62n ± 0%   -3.64% (p=0.000 n=10)
ValidLongMostlyASCII          113.5µ ± 0%   113.5µ ± 0%        ~ (p=0.303 n=10)
ValidLongJapanese             204.6µ ± 0%   206.8µ ± 0%   +1.07% (p=0.000 n=10)
ValidStringTenASCIIChars      7.604n ± 0%   6.803n ± 0%  -10.53% (p=0.000 n=10)
ValidString100KASCIIChars     38.05µ ± 0%   17.14µ ± 0%  -54.97% (p=0.000 n=10)
ValidStringTenJapaneseChars   60.58n ± 0%   59.48n ± 0%   -1.82% (p=0.000 n=10)
ValidStringLongMostlyASCII    113.5µ ± 0%   113.4µ ± 0%   -0.10% (p=0.000 n=10)
ValidStringLongJapanese       205.9µ ± 0%   207.3µ ± 0%   +0.67% (p=0.000 n=10)
geomean                       3.324µ        2.756µ       -17.08%

Change-Id: Id43b6e2e41907bd4b92f421dacde31f048db47d6
Reviewed-on: https://go-review.googlesource.com/c/go/+/662495
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2025-04-09 09:18:20 -07:00
David Chase ecc06f0db7 cmd/compile: fix the test for ABI specification so it works right w/ generics
Change-Id: I09ef615bfe69a30fa8f7eef5f0a8ff94a244c920
Reviewed-on: https://go-review.googlesource.com/c/go/+/663776
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2025-04-09 00:32:10 -07:00
Keith Randall 0909bcd9e4 syscall: remove unused windows function
It's causing the dependency test to fail.

Fixes #73274

Change-Id: I7d80ea4872e360c16ac3b77acf15fa2660d117b3
Reviewed-on: https://go-review.googlesource.com/c/go/+/663975
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2025-04-08 17:13:04 -07:00
Neal Patel 53badd4836 net/http: push roundTrip panic higher in the stack
If Transport is a non-nil interface pointing to a nil implementer,
then a panic inside of roundTrip further obsfucates the issue.

Change-Id: I47664b8e6185c5f56b5e529f49022484b5ea1d94
Reviewed-on: https://go-review.googlesource.com/c/go/+/661897
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2025-04-08 14:27:47 -07:00
Damien Neil ec4a9fb321 context: don't return a nil Cause for a canceled custom context
Avoid a case where Cause(ctx) could return nil for a canceled context,
when ctx is a custom context implementation and descends from a
cancellable-but-not-canceled first-party Context.

Fixes #73258

Change-Id: Idbd81ccddea82ecabece4373d718baae6ca4b58e
Reviewed-on: https://go-review.googlesource.com/c/go/+/663936
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2025-04-08 14:04:56 -07:00
cuishuang 3acd440219 time: add examples for AppendBinary and AppendText
Change-Id: I61529b5162f8a77d3bbffcbbac98c834a7626e3a
Reviewed-on: https://go-review.googlesource.com/c/go/+/661935
Reviewed-by: Sean Liao <sean@liao.dev>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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Reviewed-by: Carlos Amedee <carlos@golang.org>
2025-04-08 13:59:46 -07:00
Alan Donovan 8433412b74 go/types: document that Defs[id] may be missing in ill-typed code
Updates #70968

Change-Id: Id0a4acd6bad917ba8a5c439625bca14469b6eb7c
Reviewed-on: https://go-review.googlesource.com/c/go/+/663895
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2025-04-08 13:26:21 -07:00
Mark Freeman 559b5d814f go/types, types2: fix failing error message test for s390x
Fixes #73206.

Change-Id: If27ce5fe7aa71415b6e2d525c78b1f04b88a308b
Reviewed-on: https://go-review.googlesource.com/c/go/+/663635
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2025-04-08 08:25:47 -07:00
qmuntal 3a4f077710 syscall: fix dangling pointers in Windows' process attributes
Windows' _PROC_THREAD_ATTRIBUTE_LIST can contain pointers to memory
owned by Go, but the GC is not aware of this. This can lead to the
memory being freed while the _PROC_THREAD_ATTRIBUTE_LIST is still in
use.

This CL uses the same approach as in x/sys/windows to ensure that the
attributes are not collected by the GC.

Fixes #73170.
Updates #73199.

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2025-04-08 07:56:17 -07:00
Mateusz Poliwczak 58b6891108 go/ast: don't MergeLine in SortImports when last import on the same line as RParen
Fixes #69183

Change-Id: I8b78dadaa8ba91e74ea2bfc21abd6abe72b7e38b
GitHub-Last-Rev: 1a41f9e8e3
GitHub-Pull-Request: golang/go#69187
Reviewed-on: https://go-review.googlesource.com/c/go/+/610035
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2025-04-08 07:56:01 -07:00
apocelipes 38a2a3c7ce runtime: use internal/byteorder
To simplify the code.

Change-Id: Ib1af5009cc25bb29fd26fdb7b29ff4579f0150aa
GitHub-Last-Rev: f698a8a771
GitHub-Pull-Request: golang/go#73255
Reviewed-on: https://go-review.googlesource.com/c/go/+/663735
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
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2025-04-08 07:47:16 -07:00
Mateusz Poliwczak 14b15a2bea internal/runtime/maps: pass proper func PC to race.WritePC/race.ReadPC
Fixes #73191

Change-Id: I0f8a5a19faa745943a98476c7caf4c97ccdce184
Reviewed-on: https://go-review.googlesource.com/c/go/+/663175
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
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2025-04-08 06:12:47 -07:00
Keith Randall af278bfb1f cmd/compile: add additional flag constant folding rules
Fixes #73200

Change-Id: I77518d37acd838acf79ed113194bac5e2c30897f
Reviewed-on: https://go-review.googlesource.com/c/go/+/663535
Reviewed-by: David Chase <drchase@google.com>
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2025-04-07 22:48:32 -07:00
Brad Fitzpatrick 92309ff771 doc/next: fix link
It was rendering incorrectly at https://tip.golang.org/doc/go1.25

Change-Id: I2f66c95414ac5d71b9b02b91bcdc0d0a87b3f605
Reviewed-on: https://go-review.googlesource.com/c/go/+/662436
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2025-04-07 13:59:43 -07:00
zhi.wang 8054d2da5b strconv: use switch for '+'/'-' prefix handling
Follow the approach used in strconv's readFloat, decimal.set, and Atoi,
where leading '+' and '-' are handled using a switch for clarity and
consistency.

Change-Id: I41eff34ce90b5ac43fcdbc0bb88910d6d5fb4d39
GitHub-Last-Rev: 0c9d2efb5a
GitHub-Pull-Request: golang/go#73185
Reviewed-on: https://go-review.googlesource.com/c/go/+/663257
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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2025-04-07 13:36:46 -07:00
abemotion b2819d13db net/http: add link to types
Some types are not linked.
This change adds a link to each type.

Change-Id: Id46fb64a74efb851ed76e4136f15e8fd9e445bb7
Reviewed-on: https://go-review.googlesource.com/c/go/+/663075
Reviewed-by: Damien Neil <dneil@google.com>
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2025-04-07 13:35:49 -07:00