cmd/compile: tighten bounds for induction variables in strided loops

for i := 0; i < 9; i += 3

Currently we compute bounds of [0,8]. Really we know that it is [0,6].

CL 415874 computed the better bound as part of overflow detection.
This CL just incorporates that better info to the prove pass.

R=go1.20

Change-Id: Ife82cc415321f6652c2b5d132a40ec23e3385766
Reviewed-on: https://go-review.googlesource.com/c/go/+/415937
Reviewed-by: Heschi Kreinick <heschi@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: Keith Randall <khr@golang.org>

runtime: convert consistentHeapStats.gen to atomic type

For #53821

Change-Id: I9f57b84f6a2c29d750fb20420daef903a9311a83
Reviewed-on: https://go-review.googlesource.com/c/go/+/425781
Run-TryBot: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

cmd/dist: disable cgo when testing internal linking of PIE

Since when internal linking cgo on some platforms, like android, is not
fully supported.

Updates #46731

Change-Id: I344a763f8dfb0cce04371d9305eee634bfd9ee77
Reviewed-on: https://go-review.googlesource.com/c/go/+/426199
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>

cmd/compile: simplify bounded shift on riscv64

The prove pass will mark some shifts bounded, and then we can use that
information to generate better code on riscv64.

Change-Id: Ia22f43d0598453c9417adac7017db28d7240948b
Reviewed-on: https://go-review.googlesource.com/c/go/+/422616
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Joel Sing <joel@sing.id.au>
Run-TryBot: Wayne Zuo <wdvxdr@golangcn.org>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Keith Randall <khr@golang.org>
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>

cmd/compile: remove NEG when used with SEQZ/SNEZ on riscv64

The negation does not change the comparison to zero.

Also remove unnecessary x.Uses == 1 condition from equivalent BEQZ/BNEZ rules.

Change-Id: I62dd8e383e42bfe5c46d11bbf78d8e5ff862a1d5
Reviewed-on: https://go-review.googlesource.com/c/go/+/426262
Reviewed-by: Cherry Mui <cherryyz@google.com>
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cmd/compile: avoid extending floating point comparision on riscv64

The result of these operations are already extended.

Change-Id: Ifc8ba362dda7035d8fd0d40046a96f61d3082877
Reviewed-on: https://go-review.googlesource.com/c/go/+/426260
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Meng Zhuo <mzh@golangcn.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>
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Reviewed-by: Cherry Mui <cherryyz@google.com>

cmd/compile: avoid extending when already sufficiently masked on riscv64

Removes more than 2000 instructions from the Go binary on linux/risv64.

Change-Id: I6db3e3b1c93f29f00869adcba7c6192bfb90b25c
Reviewed-on: https://go-review.googlesource.com/c/go/+/426259
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Reviewed-by: Heschi Kreinick <heschi@google.com>
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Reviewed-by: Wayne Zuo <wdvxdr@golangcn.org>
Reviewed-by: Meng Zhuo <mzh@golangcn.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>

runtime: convert rwmutex.{readerCount,readerWait} to atomic type

For #53821

Change-Id: Ib10a745799e8bc0dc1d02a9c3e5d00b2842a9edd
Reviewed-on: https://go-review.googlesource.com/c/go/+/425779
Run-TryBot: Michael Pratt <mpratt@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
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cmd/compile: add support for unsafe.{String,StringData,SliceData}

For #53003

Change-Id: I13a761daca8b433b271a1feb711c103d9820772d
Reviewed-on: https://go-review.googlesource.com/c/go/+/423774
Reviewed-by: Heschi Kreinick <heschi@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: hopehook <hopehook@golangcn.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

runtime: convert worldIsStopped to atomic type

For #53821

Change-Id: I246b65ddb1171d2cab42f98092c64f20ecef392a
Reviewed-on: https://go-review.googlesource.com/c/go/+/425778
Run-TryBot: Michael Pratt <mpratt@google.com>
Reviewed-by: Heschi Kreinick <heschi@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>

internal/poll, internal/syscall/unix, net, runtime: convert openbsd (except mips64) to direct libc calls

Call libc wrappers directly rather than calling using syscall(2).

Updates golang/go#36435

Change-Id: I40be410c7472f7d89cbec2ebdc7c841c7726ca4a
Reviewed-on: https://go-review.googlesource.com/c/go/+/425637
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Heschi Kreinick <heschi@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Joel Sing <joel@sing.id.au>

cmd/asm: fix condition check to work on ppc64

A condition check was added to parse.go in CL 405542 to prevent
usage of scaled operands on ppc64. However while trying to improve
the error notification message, an if-condition was left out by
oversight. This CL corrects that.

Change-Id: I8cef3dd194c75343354ffe888b5e639e694badde
Reviewed-on: https://go-review.googlesource.com/c/go/+/426994
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: Archana Ravindar <aravind5@in.ibm.com>
Reviewed-by: Heschi Kreinick <heschi@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

cmd/internal/obj/arm64: allow transition from $0 to ZR for MSR

Previously the first operand of MSR could be $0, which would be
converted to the ZR register. This is prohibited by CL 404316,
this CL restores this instruction format.

Change-Id: I5b5be59e76aa58423a0fb96942d1b2a9de62e311
Reviewed-on: https://go-review.googlesource.com/c/go/+/426198
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
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Run-TryBot: Eric Fang <eric.fang@arm.com>

runtime: fix comment typo in mpagealloc.go

leve --> level

Change-Id: Ia5ff46c79c4dda2df426ec75d69e8fcede909b47
GitHub-Last-Rev: e57cad22d99b74c7e220f4d5a7b03a830544aea9
GitHub-Pull-Request: golang/go#54788
Reviewed-on: https://go-review.googlesource.com/c/go/+/426974
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Keith Randall <khr@golang.org>
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Auto-Submit: Keith Randall <khr@google.com>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Keith Randall <khr@google.com>

runtime: convert semaRoot.nwait to atomic type

For #53821

Change-Id: I686fe81268f70acc6a4c3e6b1d3ed0e07bb0d61c
Reviewed-on: https://go-review.googlesource.com/c/go/+/425775
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runtime: convert p.numTimers and p.deletedTimers to internal atomic types

Note that this changes the non-atomic operations in p.destroy() to atomic operations.

For #53821

Change-Id: I7bba77c9a2287ba697c87cce2c79293e4d1b3334
Reviewed-on: https://go-review.googlesource.com/c/go/+/425774
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runtime: convert sig.{state,delivering} to atomic type

For #53821

Change-Id: I1c8df255ce9e2345d4fa45bd4d1761b73b9fa064
Reviewed-on: https://go-review.googlesource.com/c/go/+/425780
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>
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runtime: convert mcache.flushGen to atomic type

For #53821

Change-Id: I90ab52a45b7fb6b9e3ff1d6ea97251549306c7aa
Reviewed-on: https://go-review.googlesource.com/c/go/+/425435
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Run-TryBot: xie cui <523516579@qq.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

runtime: convert mOS.profileTimerValid to internal atomic type

For #53821

Change-Id: I6ef90867e918d4907baa83c5a811f1f93e8c09a5
Reviewed-on: https://go-review.googlesource.com/c/go/+/426196
Reviewed-by: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Michael Pratt <mpratt@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>

runtime: convert workType.cycles to internal atomic types

Note that this changes a non-atomic operation to atomic operation in gcStart().

For #53821

Change-Id: I754d254f6f190855144ff62151b6bae673b47867
Reviewed-on: https://go-review.googlesource.com/c/go/+/425776
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Auto-Submit: Michael Pratt <mpratt@google.com>
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Run-TryBot: Michael Knyszek <mknyszek@google.com>

runtime: convert extram and extraMWaiters to internal atomic type

Updates #53821

Change-Id: Id579b2f8e48dfbe9f37e02d2fa8c94354f9887a4
Reviewed-on: https://go-review.googlesource.com/c/go/+/425480
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Run-TryBot: hopehook <hopehook@golangcn.org>
Auto-Submit: Michael Pratt <mpratt@google.com>
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net/http/pprof: link docs to runtime/pprof

And add some documentation for the debug query param.

Fixes #27737
Fixes #53971

Change-Id: I629aaa2d4a43175381eb04872f1caad238519a41
Reviewed-on: https://go-review.googlesource.com/c/go/+/421635
Run-TryBot: Cherry Mui <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Cherry Mui <cherryyz@google.com>
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cmd/compile: teach prove about bitwise OR operation

Fixes #45928.

Change-Id: Ifbb0effbca4ab7c0eb56069fee40edb564553c35
Reviewed-on: https://go-review.googlesource.com/c/go/+/410336
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Wayne Zuo <wdvxdr@golangcn.org>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

cmd/compile: derive relation between x+delta and x in prove

If x+delta cannot overflow/underflow, we can derive:
  x+delta < x if delta<0 (this CL included)
  x+delta > x if delta>0 (this CL not included due to
  a recursive stack overflow)

Remove 95 bounds checks during ./make.bat

Fixes #51622

Change-Id: I60d9bd84c5d7e81bbf808508afd09be596644f09
Reviewed-on: https://go-review.googlesource.com/c/go/+/406175
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Wayne Zuo <wdvxdr@golangcn.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>

cmd/compile: avoid excessive libfuzzer instrumentation of int compares

Do not intercept integer compares that are used to increment libFuzzer's
8-bit counters. This is unnecessary and has a negative impact on the
fuzzing performance. This fixes #53760.

Change-Id: Id22efac968b18014eedabb6f0762e1456897024e
GitHub-Last-Rev: 52f69fd68c21001beb7b853d4f0343ece0d3f9d1
GitHub-Pull-Request: golang/go#53786
Reviewed-on: https://go-review.googlesource.com/c/go/+/416796
Run-TryBot: Keith Randall <khr@golang.org>
Auto-Submit: Keith Randall <khr@golang.org>
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Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>

cmd/compile/internal/noder: reuse package scope's names

Change-Id: I2cc62efb7bb3b47f1ee3ed0bb77e35c47e2df9a1
GitHub-Last-Rev: 106cb494de6fb08302018bff55944ee120ef4545
GitHub-Pull-Request: golang/go#54718
Reviewed-on: https://go-review.googlesource.com/c/go/+/426297
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
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reflect: use cgo.Incomplete instead of go:notinheap in tests

go:notinheap will be replaced by runtime/internal/sys.NotInHeap, and for
longer term, we want to restrict all of its usages inside the runtime
package only.

Updates #46731

Change-Id: I267adc2a19f0dc8a1ed29b5b4aeec1a7dc7318d5
Reviewed-on: https://go-review.googlesource.com/c/go/+/421880
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Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Keith Randall <khr@google.com>
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cmd/compile: regenerate node_gen.go

Looks like CL 413361 which added CaseClause.RTypes missed the need
to regenerate this file.

Also CL 413357 added DynamicTypeAssertExpr.SrcRType, same issue.

Change-Id: I45e4d0685cc2f9bdcef1fad2cfc92e7005ef363e
Reviewed-on: https://go-review.googlesource.com/c/go/+/426675
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Reviewed-by: David Chase <drchase@google.com>
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Reviewed-by: Matthew Dempsky <mdempsky@google.com>

testing: increment tempDirSeq non-atomically

It's unnecessary to to call atomic.AddInt32 since there is a mutex lock.

Change-Id: I31fcece17c34f99a95772d744aebd3f6a8cf1d23
Reviewed-on: https://go-review.googlesource.com/c/go/+/426081
Reviewed-by: Michael Pratt <mpratt@google.com>
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Reviewed-by: Bryan Mills <bcmills@google.com>
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Auto-Submit: Bryan Mills <bcmills@google.com>

cmd/go/internal/imports: recognize "unix" build tag

For #20322
For #51572
Fixes #54712

Change-Id: I22fcfa820e83323bfdf1a40deee7286240f02b3e
GitHub-Last-Rev: cd2c6536b0298baf3c54e5bdbc456a814545cff4
GitHub-Pull-Request: golang/go#54716
Reviewed-on: https://go-review.googlesource.com/c/go/+/426296
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Reviewed-by: Bryan Mills <bcmills@google.com>

cmd/compile: only inline method wrapper if method don't contain closures

CL 327871 changes methodWrapper to always perform inlining after global
escape analysis. However, inlining the method may reveal closures, which
require walking all function bodies to decide whether to capture free
variables by value or by ref.

To fix it, just not doing inline if the method contains any closures.

Fixes #53702

Change-Id: I4b0255b86257cc6fe7e5fafbc545cc5cff9113e1
Reviewed-on: https://go-review.googlesource.com/c/go/+/426334
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
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cmd/compile: fix unified IR shapifying recursive instantiated types

Shape-based stenciling in unified IR is done by converting type argument
to its underlying type. So it agressively check that type argument is
not a TFORW. However, for recursive instantiated type argument, it may
still be a TFORW when shapifying happens. Thus the assertion failed,
causing the compiler crashing.

To fix it, just allow fully instantiated type when shapifying.

Fixes #54512
Fixes #54722

Change-Id: I527e3fd696388c8a37454e738f0324f0c2ec16cb
Reviewed-on: https://go-review.googlesource.com/c/go/+/426335
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Reviewed-by: Matthew Dempsky <mdempsky@google.com>

cmd/go: go clean should not accept flags like -modcache with packages

For #53725

Change-Id: I99a85b437d5f918dba74c4eccefcf8087193646a
Reviewed-on: https://go-review.googlesource.com/c/go/+/425874
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cmd/asm: add new classification for index memory operands on PPC64

When a base+displacement kind of operand is given in an index-mode
instruction, the assembler does not flag it as an invalid instruction
causing the user to get an incorrect encoding of that instruction
leading to incorrect execution of the program.
Enable assembler to recognize valid and invalid operands used in index
mode instructions by classifying SOREG type into two further types
XOREG (used uniquely in index addressing mode instructions) and SOREG
for instructions working on base+displacement operands.
Also cleaned up usage of obj.Addr.Scale on PPC64.

Change-Id: Ib4d84343ae57477c6c074f44c4c2749496e11b91
Reviewed-on: https://go-review.googlesource.com/c/go/+/405542
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Archana Ravindar <aravind5@in.ibm.com>

crypto/sha512: optimize ARM64 sha512 implemention

This CL enable sha512 for arm64 and ~390% performance
improvement.

Contributed under the Go License with permission of
Linaro by Carlos Eduardo Seo <carlos.seo@linaro.org>

https://perf.golang.org/search?q=upload:20220526.18

Hash8Bytes/New 16.0MB/s ± 0% 61.3MB/s ± 0% +283.97% (p=0.000 n=9+9)
Hash8Bytes/Sum384 16.4MB/s ± 0% 64.8MB/s ± 0% +295.31% (p=0.000 n=8+9)
Hash8Bytes/Sum512 16.3MB/s ± 0% 64.2MB/s ± 0% +293.37% (p=0.000 n=10+10)
Hash1K/New 252MB/s ± 0% 1217MB/s ± 0% +383.00% (p=0.000 n=9+10)
Hash1K/Sum384 253MB/s ± 0% 1237MB/s ± 0% +389.25% (p=0.000 n=10+10)
Hash1K/Sum512 253MB/s ± 0% 1231MB/s ± 0% +387.37% (p=0.000 n=10+8)
Hash8K/New 284MB/s ± 0% 1405MB/s ± 2% +395.19% (p=0.000 n=9+8)
Hash8K/Sum384 284MB/s ± 0% 1413MB/s ± 0% +397.76% (p=0.000 n=10+8)
Hash8K/Sum512 284MB/s ± 0% 1411MB/s ± 0% +397.19% (p=0.000 n=10+10)

Change-Id: I4476da23d8cd376bf1f75d946d6b0c58470df1b8
Reviewed-on: https://go-review.googlesource.com/c/go/+/180257
Reviewed-by: Carlos Eduardo Seo <carlos.seo@linaro.org>
Reviewed-by: Ard Biesheuvel <ardb@google.com>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Run-TryBot: Meng Zhuo <mzh@golangcn.org>
TryBot-Result: Gopher Robot <gobot@golang.org>

cmd/compile: intrinsify RotateLeft{32,64} on loong64

Benchmark on crypto/sha256 (provided by Xiaodong Liu):
name               old time/op    new time/op    delta
Hash8Bytes/New       1.19µs ± 0%    0.97µs ± 0%  -18.75%  (p=0.000 n=9+9)
Hash8Bytes/Sum224    1.21µs ± 0%    0.97µs ± 0%  -20.04%  (p=0.000 n=9+10)
Hash8Bytes/Sum256    1.21µs ± 0%    0.98µs ± 0%  -19.16%  (p=0.000 n=10+7)
Hash1K/New           15.9µs ± 0%    12.4µs ± 0%  -22.10%  (p=0.000 n=10+10)
Hash1K/Sum224        15.9µs ± 0%    12.4µs ± 0%  -22.18%  (p=0.000 n=8+10)
Hash1K/Sum256        15.9µs ± 0%    12.4µs ± 0%  -22.15%  (p=0.000 n=10+9)
Hash8K/New            119µs ± 0%      92µs ± 0%  -22.40%  (p=0.000 n=10+9)
Hash8K/Sum224         119µs ± 0%      92µs ± 0%  -22.41%  (p=0.000 n=9+10)
Hash8K/Sum256         119µs ± 0%      92µs ± 0%  -22.40%  (p=0.000 n=9+9)

name               old speed      new speed      delta
Hash8Bytes/New     6.70MB/s ± 0%  8.25MB/s ± 0%  +23.13%  (p=0.000 n=10+10)
Hash8Bytes/Sum224  6.60MB/s ± 0%  8.26MB/s ± 0%  +25.06%  (p=0.000 n=10+10)
Hash8Bytes/Sum256  6.59MB/s ± 0%  8.15MB/s ± 0%  +23.67%  (p=0.000 n=10+7)
Hash1K/New         64.3MB/s ± 0%  82.5MB/s ± 0%  +28.36%  (p=0.000 n=10+10)
Hash1K/Sum224      64.3MB/s ± 0%  82.6MB/s ± 0%  +28.51%  (p=0.000 n=10+10)
Hash1K/Sum256      64.3MB/s ± 0%  82.6MB/s ± 0%  +28.46%  (p=0.000 n=9+9)
Hash8K/New         69.0MB/s ± 0%  89.0MB/s ± 0%  +28.87%  (p=0.000 n=10+8)
Hash8K/Sum224      69.0MB/s ± 0%  89.0MB/s ± 0%  +28.88%  (p=0.000 n=9+10)
Hash8K/Sum256      69.0MB/s ± 0%  88.9MB/s ± 0%  +28.87%  (p=0.000 n=8+9)

Benchmark on crypto/sha512 (provided by Xiaodong Liu):
name               old time/op    new time/op     delta
Hash8Bytes/New       1.55µs ± 0%     1.31µs ± 0%  -15.67%  (p=0.000 n=10+10)
Hash8Bytes/Sum384    1.59µs ± 0%     1.35µs ± 0%  -14.97%  (p=0.000 n=10+10)
Hash8Bytes/Sum512    1.62µs ± 0%     1.39µs ± 0%  -14.02%  (p=0.000 n=10+10)
Hash1K/New           10.7µs ± 0%      8.6µs ± 0%  -19.60%  (p=0.000 n=8+8)
Hash1K/Sum384        10.8µs ± 0%      8.7µs ± 0%  -19.40%  (p=0.000 n=9+9)
Hash1K/Sum512        10.8µs ± 0%      8.7µs ± 0%  -19.35%  (p=0.000 n=9+10)
Hash8K/New           74.6µs ± 0%     59.6µs ± 0%  -20.08%  (p=0.000 n=10+9)
Hash8K/Sum384        74.7µs ± 0%     59.7µs ± 0%  -20.04%  (p=0.000 n=9+8)
Hash8K/Sum512        74.7µs ± 0%     59.7µs ± 0%  -20.01%  (p=0.000 n=10+10)

name               old speed      new speed       delta
Hash8Bytes/New     5.16MB/s ± 0%   6.12MB/s ± 0%  +18.60%  (p=0.000 n=10+8)
Hash8Bytes/Sum384  5.02MB/s ± 0%   5.90MB/s ± 0%  +17.56%  (p=0.000 n=10+10)
Hash8Bytes/Sum512  4.94MB/s ± 0%   5.74MB/s ± 0%  +16.29%  (p=0.000 n=10+9)
Hash1K/New         95.4MB/s ± 0%  118.6MB/s ± 0%  +24.38%  (p=0.000 n=10+10)
Hash1K/Sum384      95.0MB/s ± 0%  117.9MB/s ± 0%  +24.06%  (p=0.000 n=8+9)
Hash1K/Sum512      94.8MB/s ± 0%  117.5MB/s ± 0%  +23.99%  (p=0.000 n=8+9)
Hash8K/New          110MB/s ± 0%    137MB/s ± 0%  +25.11%  (p=0.000 n=9+6)
Hash8K/Sum384       110MB/s ± 0%    137MB/s ± 0%  +25.07%  (p=0.000 n=9+8)
Hash8K/Sum512       110MB/s ± 0%    137MB/s ± 0%  +25.01%  (p=0.000 n=10+10)

Change-Id: I28ccfce634659305a336c8e0a3f8589f7361d661
Reviewed-on: https://go-review.googlesource.com/c/go/+/422317
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Wayne Zuo <wdvxdr@golangcn.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: David Chase <drchase@google.com>

cmd/internal/obj/loong64: add ROTR, ROTRV instructions support

Reference: https://loongson.github.io/LoongArch-Documentation/LoongArch-Vol1-EN.html

Change-Id: I29adb84eb70bffd963c79ed6957a5197896fb2bf
Reviewed-on: https://go-review.googlesource.com/c/go/+/422316
Run-TryBot: Wayne Zuo <wdvxdr@golangcn.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>

cmd/compile: fix wrong position when rewriting to OpArg/OpArgXXX

When spilling arg to stack or register, if it's a newly created value,
the arg position should be preserved. Otherwise, we may end up using
position information from deadcode lines.

This fixes the minimized test case in #54625 by mdempsky@, and make
building std successfully. However, the inline trees for these tests
still be corrupted:

 - fixedbugs/issue53982.go
 - typeparam/issue47775.go
 - typeparam/issue47775b.go
 - typeparam/issue49432.go

We probably still mess up the inline position somewhere else.

Updates #54625

Change-Id: I0d87e26b9ab451b85b6e79787da74a2b79a16209
Reviewed-on: https://go-review.googlesource.com/c/go/+/425785
Reviewed-by: David Chase <drchase@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>

reflect: clarify Value.Equal behavior for non-comparable values

The current implementation always returns false for non-comparable
values, update the doc to reflect that.

Change-Id: I87f2da408874b0a209c8f51949e3310da15c5904
Reviewed-on: https://go-review.googlesource.com/c/go/+/426195
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: xie cui <523516579@qq.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: hopehook <hopehook@golangcn.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>

cmd/go: skip gccgo cgo tests in TestScript/build_overlay

cgo builds with -compiler=gccgo are broken as of CL 421879.

For #54761.
Updates #46731.

Change-Id: I0306b0bd96669f70279fc96814cc72d934a1ad6e
Reviewed-on: https://go-review.googlesource.com/c/go/+/426496
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Bryan Mills <bcmills@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>

cmd/go/internal/modfetch: distinguish "unsupported" errors from RecentTag

CL 426079 started checking errors from RecentTag.
Unfortunately, we forgot to run "-longtest" SlowBots, and it turns out
to have broken non-short tests for non-git VCS implementations,
because those don't implement the RecentTag method.

Updates #53935.

Change-Id: I5935f2f4b3f684515e99e8bf70a840154c36249f
Reviewed-on: https://go-review.googlesource.com/c/go/+/426495
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Auto-Submit: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

context: convert goroutines to atomic type

Change-Id: I021fbc9786a3e3f858770fe3e109a0de487390d8
Reviewed-on: https://go-review.googlesource.com/c/go/+/426089
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Run-TryBot: xie cui <523516579@qq.com>
Reviewed-by: Damien Neil <dneil@google.com>

testing: convert common.hasSub to atomic type

Change-Id: I3d8a9b901efabe62f432c06361826f46c78d2605
Reviewed-on: https://go-review.googlesource.com/c/go/+/426080
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>
Auto-Submit: Michael Pratt <mpratt@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

sync: switch Map to use atomic.Pointer

There was no noticeable change in performance.

Change-Id: I9c57bf836c8b6066e0620afb3d536ce99e4b9d87
Reviewed-on: https://go-review.googlesource.com/c/go/+/426074
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Auto-Submit: Joseph Tsai <joetsai@digital-static.net>
Run-TryBot: Joseph Tsai <joetsai@digital-static.net>
TryBot-Result: Gopher Robot <gobot@golang.org>

debug/macho: use saferio to allocate Load and Symbol slices

Avoid allocating large amounts of memory for corrupt input.

No test case because the problem can only happen for invalid data.
Let the fuzzer find cases like this.

Change-Id: I2d1745200611f0af06ca58adcc3e2309ad6742d8
Reviewed-on: https://go-review.googlesource.com/c/go/+/425882
Run-TryBot: Dan Kortschak <dan@kortschak.io>
Auto-Submit: Dan Kortschak <dan@kortschak.io>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>

testing: explain using a _test package

The existing documentation did not explain the difference between
placing a _test.go file in the same package as what is being
tested vs. adding it to a separate _test package. This explains the
distinction and adds an example.

Concept is explained well here:  https://stackoverflow.com/a/31443271

Fixes #25223

Change-Id: Iebaba15207d8aa24f0b370d8dd4062eadb504b5c
GitHub-Last-Rev: 7f49c5f4624b358af8052272da8ac3240751ada0
GitHub-Pull-Request: golang/go#54160
Reviewed-on: https://go-review.googlesource.com/c/go/+/420415
Reviewed-by: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Auto-Submit: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>

internal/poll: use sync.Once instead to guard CopyFileRange() with kernel 5.3

The existing implementation creates more branches with more states: -1, 0, 1,
which makes it not very intuitive to understand, let's use sync.Once and boolean
instead to make it more straightforward.

Change-Id: I05766e5fdf7dba37d6565f84d3db4373f9342fe5
Reviewed-on: https://go-review.googlesource.com/c/go/+/425880
Run-TryBot: Ian Lance Taylor <iant@google.com>
Reviewed-by: Heschi Kreinick <heschi@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>

time: use internal/itoa

In initLocal for GOOS=js, use internal/itoa introduced in CL 301549
instead of a local implementation.

Change-Id: If107d5cf0ce56f4d926507db2cbd6da422c6d15a
Reviewed-on: https://go-review.googlesource.com/c/go/+/425302
Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

debug/elf: validate offset and file size ranges

Change-Id: Iebe31b91c6e81438120f50a8089a8efca3d5339d
Reviewed-on: https://go-review.googlesource.com/c/go/+/426115
Run-TryBot: Dan Kortschak <dan@kortschak.io>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

net: add the missing OS Darwin in the comment of sendFile

Change-Id: Ice7e3762d4a1d71e23d619be699697f5c6523cc5
Reviewed-on: https://go-review.googlesource.com/c/go/+/425879
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

cmd/go/internal/modfetch: report error on failing to derive pseudo version from recent tag

The current implementation ignores the error when it tries to get
the recent tag on revisions, which results in incorrect pseudo
version (v0.0.0-) is derived.

Fixes #53935

Change-Id: I153d851eb913fb7e40051e194c92b9ca5bf0e906
GitHub-Last-Rev: 6ba1d90df56cc0f30557863aa8418c54885abb14
GitHub-Pull-Request: golang/go#54701
Reviewed-on: https://go-review.googlesource.com/c/go/+/426079
Reviewed-by: Bryan Mills <bcmills@google.com>
Auto-Submit: Bryan Mills <bcmills@google.com>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Reviewed-by: Damien Neil <dneil@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Bryan Mills <bcmills@google.com>

time: add fuzz test for Time.appendFormatRFC3339

Time.appendFormatRFC3339 is a specialized implementation of
Time.appendFormat. We expect the two to be identical.
Add a fuzz test to ensure this property.

Updates #54093

Change-Id: I0bc41ee6e016d3dac75d1ac372d8c9c7266d0299
Reviewed-on: https://go-review.googlesource.com/c/go/+/425100
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
Auto-Submit: Joseph Tsai <joetsai@digital-static.net>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>

internal/trace: fix typo in goroutines.go

assosciated -> associated

Change-Id: Id1cbbdea12f0239a9e173ece934c18cc9ffcf0f4
GitHub-Last-Rev: 7fea9de6c27b95f91591db4b5bd9023eb80dc522
GitHub-Pull-Request: golang/go#54739
Reviewed-on: https://go-review.googlesource.com/c/go/+/425596
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Auto-Submit: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Michael Knyszek <mknyszek@google.com>

net/http: FileServer method check + minimal OPTIONS implementation

FileServer provides a read-only service. Methods other than GET or HEAD should
be denied with an Allow header.

Fixes #53501

Change-Id: I1d31b405eefd90565ecd474ac3f8d8d6e3b15072
Reviewed-on: https://go-review.googlesource.com/c/go/+/413554
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Damien Neil <dneil@google.com>
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: Heschi Kreinick <heschi@google.com>

cmd/compile/obj/arm64: fix encoding error of FMOVD/FMOVS $0|ZR

Previously the first operand of FMOVD and FMOVS could be $0, which
would be converted to the ZR register. This is prohibited by CL 404316,
also it broken the encoding of "FMOVD/FMOVS ZR, Rn", this CL restores
this instruction format and fixes the encoding issue.

Fixes #54655.
Fixes #54729.

Change-Id: I9c42cd41296bed7ffd601609bd8ecaa27d11e659
Reviewed-on: https://go-review.googlesource.com/c/go/+/425188
Run-TryBot: Eric Fang <eric.fang@arm.com>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
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reflect: simplify array value comparable check

If array element is not interface, array or struct, we just need to
check whether the array element type is comparable.

Change-Id: I1ab94cfa17ae86feb6cd3fbdf878af5a776e7bec
Reviewed-on: https://go-review.googlesource.com/c/go/+/426194
Reviewed-by: Cherry Mui <cherryyz@google.com>
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image/png: allow both PLTE and tRNS chunks for TrueColor

Prior to this commit, png.Decode would allow TrueColor PNG images that
have one but not both of PLTE and tRNS chunks.

Fixes #54142

Change-Id: I259c1fff86a0aa5640dbadf7ad834e05fbd1430c
Reviewed-on: https://go-review.googlesource.com/c/go/+/424916
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Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Nigel Tao (INACTIVE; USE @golang.org INSTEAD) <nigeltao@google.com>

testing: convert numFailed to atomic type

Change-Id: Ic3464e95ad8901df5477d7717760b8c6d08ce97b
Reviewed-on: https://go-review.googlesource.com/c/go/+/426078
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cmd/go/internal/modload: return error when duplicate module paths among modules in go.work

Fixes #54048

Change-Id: I27350af451ff50532856092f2d99b6cc6dc6743d
Reviewed-on: https://go-review.googlesource.com/c/go/+/419557
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: David Chase <drchase@google.com>
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debug/pe: check size in uint64 to avoid overflow

uint32(sz) != n*uint32(ddSz) can go wrong if
the RHS overflows, so do it in wider precision.

Fixes #54640.

Change-Id: I776563330e46de6cdacd4055f6ff08e7de67797f
Reviewed-on: https://go-review.googlesource.com/c/go/+/425364
Reviewed-by: Dan Kortschak <dan@kortschak.io>
Reviewed-by: Ian Lance Taylor <iant@google.com>
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cmd/cgo: add and use runtime/cgo.Incomplete instead of //go:notinheap

Updates #46731

Change-Id: Ia83f27c177cc2f57e240cb5c6708d4552423f5be
Reviewed-on: https://go-review.googlesource.com/c/go/+/421879
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Reviewed-by: Keith Randall <khr@golang.org>
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cmd/compile: intrinsify Sub64 on riscv64

After this CL, the performance difference in crypto/elliptic
benchmarks on linux/riscv64 are:

name                 old time/op    new time/op    delta
ScalarBaseMult/P256    1.64ms ± 1%    1.60ms ± 1%   -2.36%  (p=0.008 n=5+5)
ScalarBaseMult/P224    1.53ms ± 1%    1.47ms ± 2%   -4.24%  (p=0.008 n=5+5)
ScalarBaseMult/P384    5.12ms ± 2%    5.03ms ± 2%     ~     (p=0.095 n=5+5)
ScalarBaseMult/P521    22.3ms ± 2%    13.8ms ± 1%  -37.89%  (p=0.008 n=5+5)
ScalarMult/P256        4.49ms ± 2%    4.26ms ± 2%   -5.13%  (p=0.008 n=5+5)
ScalarMult/P224        4.33ms ± 1%    4.09ms ± 1%   -5.59%  (p=0.008 n=5+5)
ScalarMult/P384        16.3ms ± 1%    15.5ms ± 2%   -4.78%  (p=0.008 n=5+5)
ScalarMult/P521         101ms ± 0%      47ms ± 2%  -53.36%  (p=0.008 n=5+5)

Change-Id: I31cf0506e27f9d85f576af1813630a19c20dda8a
Reviewed-on: https://go-review.googlesource.com/c/go/+/420095
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Joel Sing <joel@sing.id.au>
Reviewed-by: David Chase <drchase@google.com>
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cmd/compile: intrinsify Add64 on riscv64

According to RISCV instruction set manual v2.2 Sec 2.4, we can
implement overflowing check for unsigned addition cheaply using
SLTU instructions.

After this CL, the performance difference in crypto/elliptic
benchmarks on linux/riscv64 are:

name                 old time/op    new time/op    delta
ScalarBaseMult/P256    1.93ms ± 1%    1.64ms ± 1%  -14.96%  (p=0.008 n=5+5)
ScalarBaseMult/P224    1.80ms ± 2%    1.53ms ± 1%  -14.89%  (p=0.008 n=5+5)
ScalarBaseMult/P384    6.15ms ± 2%    5.12ms ± 2%  -16.73%  (p=0.008 n=5+5)
ScalarBaseMult/P521    25.9ms ± 1%    22.3ms ± 2%  -13.78%  (p=0.008 n=5+5)
ScalarMult/P256        5.59ms ± 1%    4.49ms ± 2%  -19.79%  (p=0.008 n=5+5)
ScalarMult/P224        5.42ms ± 1%    4.33ms ± 1%  -20.01%  (p=0.008 n=5+5)
ScalarMult/P384        19.9ms ± 2%    16.3ms ± 1%  -18.15%  (p=0.008 n=5+5)
ScalarMult/P521        97.3ms ± 1%   100.7ms ± 0%   +3.48%  (p=0.008 n=5+5)

Change-Id: Ic4c82ced4b072a4a6575343fa9f29dd09b0cabc4
Reviewed-on: https://go-review.googlesource.com/c/go/+/420094
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net: add FlagRunning to exactly reflect the states of an interface.

Correctly set this flag while parsing the syscall result.

The FlagUp flag can not distinguish the following situations:
1. interface is plugged, automatically up, and in running(UP) state
2. interface is not plugged, administratively or manually set to up,
but in DOWN state

So, We can't distinguish the state of a NIC by the FlagUp flag alone.

Fixes #53482

Change-Id: I43796bea1a7f72d1fddfef914efe603c81995e1b
GitHub-Last-Rev: 686b5d888e97e9b90cf36ac0c15943eb97e125d4
GitHub-Pull-Request: golang/go#53484
Reviewed-on: https://go-review.googlesource.com/c/go/+/413454
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Reviewed-by: Ryan Schuster <shuey19831@gmail.com>
Reviewed-by: Jianwei Mao <maojianwei2020@gmail.com>
Reviewed-by: Damien Neil <dneil@google.com>

debug/elf: fix reloc number of R_PPC64_SECTOFF_LO_DS

R_PPC64_SECTOFF_LO_DS is defined as reloc 62 on all PPC64 ELF ABIs.

Fixes #53356

Change-Id: I5fabf6be32f3310c5aed47d4d654e05fb7bc9de0
Reviewed-on: https://go-review.googlesource.com/c/go/+/411915
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net: Resolver.LookupIP return error for empty string

Fixes #53995

Change-Id: Ib0de237b57382feb6b8070f2310945aef6c7db01
Reviewed-on: https://go-review.googlesource.com/c/go/+/419734
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Reviewed-by: David Chase <drchase@google.com>
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reflect: add Value.{Comparable,Equal}

For #46746

Change-Id: I879124974cdb55932cd9d07d3b384d49d5059857
Reviewed-on: https://go-review.googlesource.com/c/go/+/423794
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cmd/compile: fix score for Select{0,1} with type flags

A recent change was made for ppc64x to treat ANDCCconst as
a tuple, allowing ANDconst to be removed from the list
of ops. Included in that change were some improvements to the
rules to avoid some extra code, mainly the elimination of a
cmp 0 following an andi. and in some cases the following
isel. While those changes worked for most cases, in a few
cases some extra unnecessary code was generated.

Currently the snippet appears in archive/zip.(*FileHeader).Mode:

        ANDCC R4,$1,R5                       // andi. r5,r4,1
        ANDCC R4,$16,R5                      // andi. r5,r4,16
        CMPW R5,R0                           // cmpw r5,r0
        ADDIS $0,$-32768,R5                  // lis r5,-32768
        OR R5,$511,R5                        // ori r5,r5,511
        MOVD $438,R6                         // li r6,438
        ISEL $2,R6,R5,R5                     // isel r5,r6,r5,eq
        MOVD $-147,R6                        // li r6,-147
        AND R6,R5,R6                         // and r6,r5,r6
        ANDCC R4,$1,R4                       // andi. r4,r4,1
        ISEL $2,R5,R6,R4                     // isel r4,r5,r6,eq

The first ANDCC is never used and should not be there.
From the ssa.html file, the scheduler is not putting the Select1
close to the ISEL, which results in the flag being clobbered
before it can be used. By changing the score for a Select0 or Select1
with type Flags, the extra ANDCC does not occur.

Change-Id: I82f4bc7c02afb1c2b1c048dc6995e0b3f9363fb3
Reviewed-on: https://go-review.googlesource.com/c/go/+/424294
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net/http: don't panic on very large MaxBytesReaderLimit

Fixes #54408

Change-Id: I454199ae5bcd087b8fc4169b7622412105e71113
GitHub-Last-Rev: a33fe7e206d0c394440962acd360df3aa9b117c3
GitHub-Pull-Request: golang/go#54415
Reviewed-on: https://go-review.googlesource.com/c/go/+/423314
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runtime: add address sanitizer support for ppc64le

updates #44853

Change-Id: I71905ee1bcb99ce7300bbed2daad3617d2643c53
Reviewed-on: https://go-review.googlesource.com/c/go/+/408814
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cmd/compile: remove branch in atomicCas{32,64} sequence on ppc64x.

This removes one of the branches in the atomicCas sequences for
ppc64/ppc64le.

Change-Id: Ibb46fbfdce052889c69e3da298f28caff540d99b
Reviewed-on: https://go-review.googlesource.com/c/go/+/422014
Reviewed-by: Archana Ravindar <aravind5@in.ibm.com>
Reviewed-by: David Chase <drchase@google.com>
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net/http: mention io.Seeker requirement in FS documentation

Both FileServer and NewFileTransport can try to seek a file, specifically
when MIME type sniffing is performed. This can be somewhat surprising to an
implementer of an fs.FS, as their filesystem will appear to work until a
user tries to access a file with an unrecognized extension (which requires
type sniffing and therefore seeking). With FileServer, this results in a
"seeker can't seek" message, which is not very clear for the developer.

The issue arises because fs.FS does not require Seek, while http.FileSystem
does. Therefore, this change adds a line to the documentation of net/http's
adapter function mentioning the requirement.

Change-Id: Ieb955b7a7f34e2be39dd696cb712513c70100b3a
GitHub-Last-Rev: fddccdae36e04fcb87d78b3b03fa4658dbb7d83d
GitHub-Pull-Request: golang/go#48781
Reviewed-on: https://go-review.googlesource.com/c/go/+/353874
Reviewed-by: Damien Neil <dneil@google.com>
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net/http: add errors.As support for x/net/http2.StreamError

To make it easier to extract the HTTP/2 error code (if any) from
net/http errors, implement an As method on the vendored copy of
golang.org/x/net/http2.StreamError. The new As method lets users work
with the vendored error type as though it were the x/net/http2
StreamError.

Fixes #53896.

Change-Id: Ib18eb428adc05a3c0e19a946ece936e2378e1c7c
Reviewed-on: https://go-review.googlesource.com/c/go/+/425104
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runtime: drop padding alignment field for timeHistogram

After CL 419449, timeHistogram always have 8-byte alignment.

Change-Id: I93145502bcafa1712b811b1a6d62da5d54d0db42
Reviewed-on: https://go-review.googlesource.com/c/go/+/425777
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mime: allow duplicate media type parameters with equivalent values

Fixes #48866

Change-Id: I2bd2c806e44eb4064b1fb9a6509d79cecbbef013
Reviewed-on: https://go-review.googlesource.com/c/go/+/363094
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Reviewed-by: Tim King <taking@google.com>
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runtime: mark all methods of atomic types with go:nosplit

Atomic types may be used anywhere in the runtime,
so they must omit its usual stack overflow checks to avoid errors from stack splits.

Change-Id: Icb497334c860bcaa284a2d5a3edc47ee89844301
Reviewed-on: https://go-review.googlesource.com/c/go/+/425484
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internal/poll: optimize the maximum amount of bytes that can be transferred by one splice(2) call

Fixes #40222

name                          old time/op    new time/op    delta
Splice/tcp-to-tcp/1024-4        5.16µs ± 1%    5.17µs ± 4%     ~     (p=0.481 n=10+10)
Splice/tcp-to-tcp/2048-4        5.46µs ± 2%    5.48µs ± 2%     ~     (p=0.617 n=10+10)
Splice/tcp-to-tcp/4096-4        6.07µs ± 3%    6.09µs ± 5%     ~     (p=0.927 n=10+10)
Splice/tcp-to-tcp/8192-4        7.07µs ± 5%    7.16µs ± 3%     ~     (p=0.324 n=10+10)
Splice/tcp-to-tcp/16384-4       8.82µs ±10%    8.83µs ±11%     ~     (p=1.000 n=10+10)
Splice/tcp-to-tcp/32768-4       12.3µs ±12%    12.7µs ± 4%     ~     (p=0.268 n=10+9)
Splice/tcp-to-tcp/65536-4       22.1µs ± 3%    22.0µs ± 3%     ~     (p=0.912 n=10+10)
Splice/tcp-to-tcp/131072-4      40.0µs ± 4%    39.9µs ± 4%     ~     (p=1.000 n=9+8)
Splice/tcp-to-tcp/262144-4      69.1µs ± 3%    67.9µs ± 2%   -1.67%  (p=0.010 n=9+10)
Splice/tcp-to-tcp/524288-4       128µs ± 3%     124µs ± 2%   -2.67%  (p=0.001 n=9+10)
Splice/tcp-to-tcp/1048576-4      242µs ± 3%     242µs ± 2%     ~     (p=0.912 n=10+10)
Splice/unix-to-tcp/1024-4       1.97µs ± 3%    1.96µs ± 2%     ~     (p=0.342 n=10+10)
Splice/unix-to-tcp/2048-4       2.19µs ± 2%    2.21µs ± 2%     ~     (p=0.150 n=9+10)
Splice/unix-to-tcp/4096-4       2.52µs ± 5%    2.50µs ± 1%     ~     (p=0.393 n=10+10)
Splice/unix-to-tcp/8192-4       3.27µs ± 4%    3.24µs ± 7%     ~     (p=0.968 n=9+10)
Splice/unix-to-tcp/16384-4      4.68µs ± 9%    4.79µs ± 8%     ~     (p=0.739 n=10+10)
Splice/unix-to-tcp/32768-4      7.82µs ±12%    7.76µs ±12%     ~     (p=0.912 n=10+10)
Splice/unix-to-tcp/65536-4      17.9µs ± 3%    17.3µs ±10%     ~     (p=0.661 n=9+10)
Splice/unix-to-tcp/131072-4     35.9µs ± 1%    31.3µs ± 4%  -12.88%  (p=0.000 n=10+9)
Splice/unix-to-tcp/262144-4     72.4µs ± 3%    55.4µs ± 2%  -23.55%  (p=0.000 n=10+10)
Splice/unix-to-tcp/524288-4      146µs ± 3%     113µs ± 1%  -22.87%  (p=0.000 n=9+9)
Splice/unix-to-tcp/1048576-4     288µs ± 3%     223µs ± 3%  -22.49%  (p=0.000 n=10+9)

name                          old speed      new speed      delta
Splice/tcp-to-tcp/1024-4       198MB/s ± 1%   198MB/s ± 4%     ~     (p=0.481 n=10+10)
Splice/tcp-to-tcp/2048-4       375MB/s ± 2%   374MB/s ± 2%     ~     (p=0.631 n=10+10)
Splice/tcp-to-tcp/4096-4       674MB/s ± 3%   673MB/s ± 5%     ~     (p=0.912 n=10+10)
Splice/tcp-to-tcp/8192-4      1.16GB/s ± 6%  1.15GB/s ± 3%     ~     (p=0.315 n=10+10)
Splice/tcp-to-tcp/16384-4     1.86GB/s ±10%  1.84GB/s ±13%     ~     (p=0.720 n=10+9)
Splice/tcp-to-tcp/32768-4     2.68GB/s ±13%  2.57GB/s ± 7%     ~     (p=0.165 n=10+10)
Splice/tcp-to-tcp/65536-4     2.97GB/s ± 3%  2.98GB/s ± 3%     ~     (p=0.912 n=10+10)
Splice/tcp-to-tcp/131072-4    3.28GB/s ± 4%  3.29GB/s ± 4%     ~     (p=1.000 n=9+8)
Splice/tcp-to-tcp/262144-4    3.80GB/s ± 3%  3.86GB/s ± 2%   +1.70%  (p=0.010 n=9+10)
Splice/tcp-to-tcp/524288-4    4.10GB/s ± 3%  4.21GB/s ± 2%   +2.74%  (p=0.001 n=9+10)
Splice/tcp-to-tcp/1048576-4   4.34GB/s ± 3%  4.33GB/s ± 2%     ~     (p=0.912 n=10+10)
Splice/unix-to-tcp/1024-4      519MB/s ± 3%   523MB/s ± 2%     ~     (p=0.353 n=10+10)
Splice/unix-to-tcp/2048-4      934MB/s ± 2%   926MB/s ± 2%     ~     (p=0.156 n=9+10)
Splice/unix-to-tcp/4096-4     1.63GB/s ± 5%  1.64GB/s ± 1%     ~     (p=0.393 n=10+10)
Splice/unix-to-tcp/8192-4     2.51GB/s ± 3%  2.53GB/s ± 7%     ~     (p=0.968 n=9+10)
Splice/unix-to-tcp/16384-4    3.52GB/s ± 8%  3.43GB/s ± 8%     ~     (p=0.739 n=10+10)
Splice/unix-to-tcp/32768-4    4.21GB/s ±14%  4.24GB/s ±13%     ~     (p=0.912 n=10+10)
Splice/unix-to-tcp/65536-4    3.65GB/s ± 5%  3.81GB/s ±11%     ~     (p=0.436 n=10+10)
Splice/unix-to-tcp/131072-4   3.65GB/s ± 1%  4.19GB/s ± 4%  +14.81%  (p=0.000 n=10+9)
Splice/unix-to-tcp/262144-4   3.62GB/s ± 3%  4.73GB/s ± 2%  +30.78%  (p=0.000 n=10+10)
Splice/unix-to-tcp/524288-4   3.59GB/s ± 3%  4.66GB/s ± 1%  +29.64%  (p=0.000 n=9+9)
Splice/unix-to-tcp/1048576-4  3.65GB/s ± 3%  4.70GB/s ± 3%  +29.01%  (p=0.000 n=10+9)

name                          old alloc/op   new alloc/op   delta
Splice/tcp-to-tcp/1024-4         0.00B          0.00B          ~     (all equal)
Splice/tcp-to-tcp/2048-4         0.00B          0.00B          ~     (all equal)
Splice/tcp-to-tcp/4096-4         0.00B          0.00B          ~     (all equal)
Splice/tcp-to-tcp/8192-4         0.00B          0.00B          ~     (all equal)
Splice/tcp-to-tcp/16384-4        0.00B          0.00B          ~     (all equal)
Splice/tcp-to-tcp/32768-4        0.00B          0.00B          ~     (all equal)
Splice/tcp-to-tcp/65536-4        0.00B          0.00B          ~     (all equal)
Splice/tcp-to-tcp/131072-4       0.00B          0.00B          ~     (all equal)
Splice/tcp-to-tcp/262144-4       0.00B          0.00B          ~     (all equal)
Splice/tcp-to-tcp/524288-4       0.00B          0.00B          ~     (all equal)
Splice/tcp-to-tcp/1048576-4      0.00B          0.00B          ~     (all equal)
Splice/unix-to-tcp/1024-4        0.00B          0.00B          ~     (all equal)
Splice/unix-to-tcp/2048-4        0.00B          0.00B          ~     (all equal)
Splice/unix-to-tcp/4096-4        0.00B          0.00B          ~     (all equal)
Splice/unix-to-tcp/8192-4        0.00B          0.00B          ~     (all equal)
Splice/unix-to-tcp/16384-4       0.00B          0.00B          ~     (all equal)
Splice/unix-to-tcp/32768-4       0.00B          0.00B          ~     (all equal)
Splice/unix-to-tcp/65536-4       0.00B          0.00B          ~     (all equal)
Splice/unix-to-tcp/131072-4      0.00B          0.00B          ~     (all equal)
Splice/unix-to-tcp/262144-4      0.00B          0.00B          ~     (all equal)
Splice/unix-to-tcp/524288-4      0.00B          0.00B          ~     (all equal)
Splice/unix-to-tcp/1048576-4     0.00B          0.00B          ~     (all equal)

name                          old allocs/op  new allocs/op  delta
Splice/tcp-to-tcp/1024-4          0.00           0.00          ~     (all equal)
Splice/tcp-to-tcp/2048-4          0.00           0.00          ~     (all equal)
Splice/tcp-to-tcp/4096-4          0.00           0.00          ~     (all equal)
Splice/tcp-to-tcp/8192-4          0.00           0.00          ~     (all equal)
Splice/tcp-to-tcp/16384-4         0.00           0.00          ~     (all equal)
Splice/tcp-to-tcp/32768-4         0.00           0.00          ~     (all equal)
Splice/tcp-to-tcp/65536-4         0.00           0.00          ~     (all equal)
Splice/tcp-to-tcp/131072-4        0.00           0.00          ~     (all equal)
Splice/tcp-to-tcp/262144-4        0.00           0.00          ~     (all equal)
Splice/tcp-to-tcp/524288-4        0.00           0.00          ~     (all equal)
Splice/tcp-to-tcp/1048576-4       0.00           0.00          ~     (all equal)
Splice/unix-to-tcp/1024-4         0.00           0.00          ~     (all equal)
Splice/unix-to-tcp/2048-4         0.00           0.00          ~     (all equal)
Splice/unix-to-tcp/4096-4         0.00           0.00          ~     (all equal)
Splice/unix-to-tcp/8192-4         0.00           0.00          ~     (all equal)
Splice/unix-to-tcp/16384-4        0.00           0.00          ~     (all equal)
Splice/unix-to-tcp/32768-4        0.00           0.00          ~     (all equal)
Splice/unix-to-tcp/65536-4        0.00           0.00          ~     (all equal)
Splice/unix-to-tcp/131072-4       0.00           0.00          ~     (all equal)
Splice/unix-to-tcp/262144-4       0.00           0.00          ~     (all equal)
Splice/unix-to-tcp/524288-4       0.00           0.00          ~     (all equal)
Splice/unix-to-tcp/1048576-4      0.00           0.00          ~     (all equal)

Change-Id: I899c1fdcb3f7b9997faf2b0d2336016a3f1fd3ea
Reviewed-on: https://go-review.googlesource.com/c/go/+/425051
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
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runtime: remove gcCPULimiterState padding for atomic fields alignment

assistTimePool and lastUpdate are now atomic.Int64, so they are
guaranteed to have 64-bit alignment, even on 32-bit platforms.

Change-Id: Ib6062a47c3a92d46d43899e1ae9d119e7f5b8bb0
Reviewed-on: https://go-review.googlesource.com/c/go/+/425460
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cmd/go/internal/modload: convert atomicLoadPkgFlags.bits to atomic type

Change-Id: I9e59530953439dec6f4524c5a7adc75c98c12b8f
Reviewed-on: https://go-review.googlesource.com/c/go/+/425456
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cmd/go/internal/trace: convert traceStarted to atomic type

Change-Id: Ia4214a29775f1178273b9b7dc84c0420bfa968de
Reviewed-on: https://go-review.googlesource.com/c/go/+/425457
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debug/macho: use saferio to read segment and section data

Avoid allocating large amounts of memory for corrupt input.

No test case because the problem can only happen for invalid data.
Let the fuzzer find cases like this.

Change-Id: Ib09d5fea54aabcb6941e541b42689222fba69632
Reviewed-on: https://go-review.googlesource.com/c/go/+/425303
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cmd/go/internal/imports: include ToolTags in the Tags map

This fixes a regression introduced when the "race" mode tag was moved to
the ToolTags field in CL 358539.

Fixes #54468

Change-Id: I107771948a4fe9d743cc13d1c15f324212b08e03
GitHub-Last-Rev: d211e351ef3331f2c38b16d327d992a32ebbfe30
GitHub-Pull-Request: golang/go#54618
Reviewed-on: https://go-review.googlesource.com/c/go/+/425154
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cmd/go/internal/par: change cacheEntry.done type to atomic.Bool

Change-Id: I95c941f83f74d57dfdd2d6803c9059691fb649b8
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cmd/test2json: add signal handler

Updates #53563

Change-Id: I35a3fd56718e198f68cbf73075a78b2fbc66bd7d
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reflect: add Value.SetZero

The v.SetZero method is a faster equivalent of v.Set(Zero(v.Type())).

Performance:

                     Direct         CachedZero     NewZero
SetZero/Bool         2.20ns ± 0%    8.97ns ± 5%    11.4ns ± 1%
SetZero/Int          3.08ns ± 1%    9.06ns ± 1%    11.5ns ± 0%
SetZero/Uint         2.88ns ± 1%    9.04ns ± 1%    11.7ns ± 5%
SetZero/Float        2.65ns ± 2%    9.05ns ± 1%    11.5ns ± 1%
SetZero/Complex      2.68ns ± 3%    9.31ns ± 1%    11.7ns ± 1%
SetZero/Array        6.69ns ± 4%    9.32ns ± 1%    11.8ns ± 1%
SetZero/Chan         3.31ns ± 1%    6.19ns ± 1%    8.20ns ± 1%
SetZero/Func         3.32ns ± 1%    6.20ns ± 0%    8.24ns ± 1%
SetZero/Interface    2.66ns ± 1%    9.31ns ± 1%    11.8ns ± 1%
SetZero/Map          3.31ns ± 1%    6.21ns ± 2%    8.19ns ± 1%
SetZero/Pointer      3.30ns ± 1%    6.22ns ± 1%    8.17ns ± 1%
SetZero/Slice        2.90ns ± 4%    9.13ns ± 1%    11.6ns ± 1%
SetZero/String       3.11ns ± 1%    9.30ns ± 1%    11.8ns ± 2%
SetZero/Struct       6.37ns ± 1%    9.18ns ± 4%    11.5ns ± 1%

where:

* Direct is measuring Value.SetZero
* CachedZero is measuring Value.Set with a cached Zero value
* NewZero is measuring Value.Set with a new Zero value

Fixes #52376

Change-Id: I793ca723aa97627824c5f5b356b2da30c8e46d71
Reviewed-on: https://go-review.googlesource.com/c/go/+/411476
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runtime: convert forcegcstate.idle to internal atomic type

Note that this changes a few unsynchronized operations of forcegcstate.idle to synchronized operations.

Updates #53821

Change-Id: I041654cc84a188fad45e2df7abce3a434f9a1f15
Reviewed-on: https://go-review.googlesource.com/c/go/+/425361
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Reviewed-by: Michael Pratt <mpratt@google.com>

runtime: convert g.selectDone to atomic type

On the write side, g.selectDone has been converted
from non-atomic to atomic access.

For #53821.

Change-Id: Iac46bc6acce7eed51dfd990285dd57f0d58b4ae2
Reviewed-on: https://go-review.googlesource.com/c/go/+/425414
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runtime: convert notifyList.wait to atomic type

For #53821

Change-Id: Ib096332fe6111bbcd2f5c4cbb29c2fef7a808e7e
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runtime: convert dlogger.owned to atomic type

Note that this changes a non-atomic operation to atomic operation.

For #53821

Change-Id: I798914f505c8d7f85f9d7629fdc6493363a20aa1
Reviewed-on: https://go-review.googlesource.com/c/go/+/425782
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runtime: convert p.statsSeq to internal atomic type

For #53821.

Change-Id: I1cab3671a29c218b8a927aba9064e63b65900173
Reviewed-on: https://go-review.googlesource.com/c/go/+/425416
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cmd/compile: align stack offset to alignment larger than PtrSize

In typebits.Set we check that the offset is a multiple of the
alignment, which makes perfect sense. But for values like
atomic.Int64, which has 8-byte alignment even on 32-bit platforms
(i.e. the alignment is larger than PtrSize), if it is on stack it
may be under-aligned, as the stack frame is only PtrSize aligned.

Normally we would prevent such values on stack, as the escape
analysis force values with higher alignment to heap. But for a
composite literal assignment like x = AlignedType{...}, the
compiler creates an autotmp for the RHS then copies it to the LHS.
The autotmp is on stack and may be under-aligned. Currently this
may cause an ICE in the typebits.Set check.

This CL makes it align the _offset_ of the autotmp to 8 bytes,
which satisfies the check. Note that this is actually lying: the
actual address at run time may not necessarily be 8-byte
aligned as we only align SP to 4 bytes.

The under-alignment is probably okay. The only purpose for the
autotmp is to copy the value to the LHS, and the copying code we
generate (at least currently) doesn't care the alignment beyond
stack alignment.

Fixes #54638.

Change-Id: I13c16afde2eea017479ff11dfc24092bcb8aba6a
Reviewed-on: https://go-review.googlesource.com/c/go/+/425256
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reflect: FuncOf support more than 50 arguments

Fixes #54669

Change-Id: I34cbe729d187437ddeafbaa910af6ed001b2603f
Reviewed-on: https://go-review.googlesource.com/c/go/+/425461
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go/types: provide a better error message for [...] array types

This matches types2 behavior.

For #54511.

Change-Id: Iea906e9fec7e334b7aa7f481de87373fa93d1c7c
Reviewed-on: https://go-review.googlesource.com/c/go/+/425715
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go/types: avoid declared but not used error for a couple of cases

The change in typexpr.go matches types2 behavior.

For #54511.

Change-Id: I79c922a94f2ee0440c1814140935c321439c7d25
Reviewed-on: https://go-review.googlesource.com/c/go/+/425714
Reviewed-by: Robert Griesemer <gri@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Robert Griesemer <gri@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
Reviewed-by: Alan Donovan <adonovan@google.com>

runtime: convert netpollWaiters to internal atomic type

Updates #53821

Change-Id: I8776382b3eb0b7752cfc0d9287b707039d3f05c6
Reviewed-on: https://go-review.googlesource.com/c/go/+/425358
Reviewed-by: Michael Pratt <mpratt@google.com>
Run-TryBot: hopehook <hopehook@qq.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>

go/types: remove support for "ERROR HERE" error markers in tests

There are only two tests that rely on the "ERROR HERE" markers;
yet those tests are trivialy adjustable (by adding an explicit
semicolon) such that they can just use the "ERROR" markers.

For #54511.

Change-Id: Idbb96ca8d35ae2584d195a4ac7c92640b8b492c5
Reviewed-on: https://go-review.googlesource.com/c/go/+/425674
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Alan Donovan <adonovan@google.com>
Run-TryBot: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>

cmd/trace: display goroutines (PC=0) with clearer description

This PR fixes: #54425 #49994

Change-Id: Id60a3ba6930f8e29b12b6d8f80945decd2ce31bc
GitHub-Last-Rev: 60a040aa2f111f64f571597799ce7ca317e1d281
GitHub-Pull-Request: golang/go#54575
Reviewed-on: https://go-review.googlesource.com/c/go/+/425042
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>

runtime: update gctrace docs and print lastStackScan instead of max

This change updates the gctrace docs to include stacks and globals in
the format line, and prints lastStackScan for "# MB stacks" instead of
maxStackScan, which is more accurate.

Fixes #54649.

Change-Id: Ibff2c390c9c9bf2b24b5b4e98ca346cc98d7cb2e
Reviewed-on: https://go-review.googlesource.com/c/go/+/425366
Run-TryBot: Michael Knyszek <mknyszek@google.com>
Auto-Submit: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>

crypto/x509: don't panic marshaling invalid ECDSA keys

MarshalPKIXPublicKey, CreateCertificate, CreateCertificateRequest,
MarshalECPrivateKey, and MarshalPKCS8PrivateKey started raising a panic
when encoding an invalid ECDSA key in Go 1.19. Since they have an error
return value, they should return an error instead.

Fixes #54288

Change-Id: Iba132cd2f890ece36bb7d0396eb9a9a77bdb81df
Reviewed-on: https://go-review.googlesource.com/c/go/+/422298
Auto-Submit: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Roland Shoemaker <roland@golang.org>
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>

go/parser: match go/defer error message of syntax package

Adjust corresponding type checker tests accordingly.

For #54511.

Change-Id: Ieaf29f26c0877973fc0acbde35292cd69a4b709c
Reviewed-on: https://go-review.googlesource.com/c/go/+/425007
Auto-Submit: Robert Griesemer <gri@google.com>
Reviewed-by: Alan Donovan <adonovan@google.com>
Run-TryBot: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>