name                    old time/op  new time/op  delta
EfaceCmpDiff-8           421ns ± 3%   299ns ± 3%  -28.93%  (p=0.000 n=92+94)
EfaceCmpDiffIndirect-8   497ns ± 4%   496ns ± 3%     ~     (p=0.840 n=98+92)

Change-Id: Id1a8c779413ba35ab0f58d055870b6a0714b51b7
Reviewed-on: https://go-review.googlesource.com/c/152163
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>

Noticed by Bryan after CL 163618 went in.

Change-Id: Ia33c80dca60321f6a8329097ff55118e5d2634ab
Reviewed-on: https://go-review.googlesource.com/c/164042
Run-TryBot: Elias Naur <mail@eliasnaur.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Updates #30228
Updates #30241

Change-Id: I7ee839f4d2840873f7e37b3aff93fe534c6b52e6
Reviewed-on: https://go-review.googlesource.com/c/163207
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Fixes #30429
Updates #16520
Updates #20733

Change-Id: Iae41f06c09aaaed500936f5496d90cefbe8293e4
Reviewed-on: https://go-review.googlesource.com/c/164119
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

These tests use runtime.GOOS and runtime.GOARCH to determine whether
to run, so must be built and run using the destination's — not the
host's — GOOS and GOARCH.

Updates #30228

Change-Id: I6774dacd01c68b395fca8ca61f70d5879270af8a
Reviewed-on: https://go-review.googlesource.com/c/164117
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Jay Conrod <jayconrod@google.com>

This test currently fails in the Android builders, with the message
	pkg_test.go:64: go test -short: exec: "go": executable file not found in $PATH
(https://build.golang.org/log/39ec0da5bfb7793359e199cc8e358ca5a8257840)

I was not able to test this change, because I can't get 'gomote
create' to return an instance of anything Android. However, I will
watch the build dashboard after submitting to verify that the fix
works.

Updates #30228

Android appears to lack a 'go' command in the.

Change-Id: Ieacac7f50d19e2cfef2f5d60e79a159e55b5cfa8
Reviewed-on: https://go-review.googlesource.com/c/164097
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Elias Naur <mail@eliasnaur.com>

This should help to catch any regressions in the course of implementing #26924.

Updates #26924

Change-Id: Ide28a9aa0235867e0ce72f855fbed51c50e2c2f2
Reviewed-on: https://go-review.googlesource.com/c/163520
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>

Fixes #30431

Change-Id: I379e78a1c385942a19e1a10b91d732f9a73899e6
Reviewed-on: https://go-review.googlesource.com/c/164041Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

'go env' is used for many quick operations, such as in go/packages to
query GOARCH and GOMOD. It often is a bottleneck; for example,
go/packages doesn't know whether or not to use Go modules until it has
queried GOMOD.

As such, this go command should be fast. Right now it's slower than it
should be. This commit adds a simple benchmark with os/exec, since we're
particularly interested in the cost of cmd/go's large init function.

Updates #29382.

Change-Id: Ifee6fb9997b9b89565fbfc2739a00c86117b1d37
Reviewed-on: https://go-review.googlesource.com/c/155961
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>

Arm64 has a 32-bit CLZ instruction CLZW, which can be used for intrinsic Len32.
Function LeadingZeros32 calls Len32, with this change, the assembly code of
LeadingZeros32 becomes more concise.

Go code:

func f32(x uint32) { z = bits.LeadingZeros32(x) }

Before:

"".f32 STEXT size=32 args=0x8 locals=0x0 leaf
        0x0000 00000 (test.go:7)        TEXT    "".f32(SB), LEAF|NOFRAME|ABIInternal, $0-8
        0x0004 00004 (test.go:7)        MOVWU   "".x(FP), R0
        0x0008 00008 ($GOROOT/src/math/bits/bits.go:30) CLZ     R0, R0
        0x000c 00012 ($GOROOT/src/math/bits/bits.go:30) SUB     $32, R0, R0
        0x0010 00016 (test.go:7)        MOVD    R0, "".z(SB)
        0x001c 00028 (test.go:7)        RET     (R30)

After:

"".f32 STEXT size=32 args=0x8 locals=0x0 leaf
        0x0000 00000 (test.go:7)        TEXT    "".f32(SB), LEAF|NOFRAME|ABIInternal, $0-8
        0x0004 00004 (test.go:7)        MOVWU   "".x(FP), R0
        0x0008 00008 ($GOROOT/src/math/bits/bits.go:30) CLZW    R0, R0
        0x000c 00012 (test.go:7)        MOVD    R0, "".z(SB)
        0x0018 00024 (test.go:7)        RET     (R30)

Benchmarks:
name              old time/op  new time/op  delta
LeadingZeros-8    2.53ns ± 0%  2.55ns ± 0%   +0.67%  (p=0.000 n=10+10)
LeadingZeros8-8   3.56ns ± 0%  3.56ns ± 0%     ~     (all equal)
LeadingZeros16-8  3.55ns ± 0%  3.56ns ± 0%     ~     (p=0.465 n=10+10)
LeadingZeros32-8  3.55ns ± 0%  2.96ns ± 0%  -16.71%  (p=0.000 n=10+7)
LeadingZeros64-8  2.53ns ± 0%  2.54ns ± 0%     ~     (p=0.059 n=8+10)

Change-Id: Ie5666bb82909e341060e02ffd4e86c0e5d67e90a
Reviewed-on: https://go-review.googlesource.com/c/157000
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>

This was implemented as part of go/doc, but it's going to be useful in
other packages. In particular, many packages under cmd/go like web and
vcs make somewhat heavy use of global regexes, which add a non-trivial
amount of init work to the cmd/go program.

A lazy wrapper around regexp.Regexp will make it trivial to get rid of
the extra cost with a trivial refactor, so make it possible for other
packages in the repository to make use of it. While naming the package,
give the members better names, such as lazyregexp.New and
lazyregexp.Regexp.

We're also considering adding some form of a lazy API to the public
regexp package, so this internal package will allow us to get some
initial experience across std and cmd.

For #29382.

Change-Id: I30b0e72871d5267c309786f95f4cb15c68b2393d
Reviewed-on: https://go-review.googlesource.com/c/164040
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

--whole-archive doesn't exist on AIX. It was already removed most of
the time but was still added with c-archive or c-shared buildmodes.

Change-Id: Ia7360638509d4a4d91674b0281ed4b112508a2c9
Reviewed-on: https://go-review.googlesource.com/c/164037
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

This reverts commit ec521467.

Reson for revert: The test cases using slowDst4 and slowDst6 are
fragile. We need to find out a better approach to the trick on the IP
routeability.

Change-Id: I544453886e809d1c7b339673d8f1d5bdef357147
Reviewed-on: https://go-review.googlesource.com/c/163919Reviewed-by: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Fixes #29355

Change-Id: I4018d420c8d413b2681744af18ffb65da03ac504
Reviewed-on: https://go-review.googlesource.com/c/155778
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Richard Musiol <neelance@gmail.com>

Fixes #30088

Change-Id: I08cec17feddc86bd08532e6b135807e3c8f4c1b2
Reviewed-on: https://go-review.googlesource.com/c/161197
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>

This commits adds a missing syscall and a missing structure in syscall
package.

Change-Id: I9d630454c56337267f7bbb023e601246e14fc929
Reviewed-on: https://go-review.googlesource.com/c/163978
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

If a type switch case expression has failed typechecking, the case body is
likely to also fail with confusing or spurious errors. Suppress
typechecking the case body when this happens.

Fixes #28926

Change-Id: Idfdb9d5627994f2fd90154af1659e9a92bf692c4
Reviewed-on: https://go-review.googlesource.com/c/158617
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>

Fixes #30253

Change-Id: I0c3d67649ea379b67f3575c1219fe05a04f056ae
Reviewed-on: https://go-review.googlesource.com/c/162859
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>

If a PE file with invalid optional header size (neither
sizeofOptionalHeader32 nor sizeofOptionalHeader64) is passed to NewFile,
the File.OptionalHeader will be nil which leads to a panic in
(*File).ImportedSymbols().

Fixes #30250

Change-Id: Ie97306de4a0e2dcfdc7b1b599891f574aa63adca
Reviewed-on: https://go-review.googlesource.com/c/162858
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>

Updates #30055

Change-Id: I3e79dd7592673c5d76568b0bcded6c391c3be6b3
Reviewed-on: https://go-review.googlesource.com/c/163081
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Adam Langley <agl@golang.org>

In Go 1.13 we will enable RSA-PSS in TLS 1.2 at the same time as we make
TLS 1.3 enabled by default.

This reverts commit 7ccd3583.

Updates #30055

Change-Id: I6f2ddf7652d1172a6b29f4e335ff3a71a89974bc
Reviewed-on: https://go-review.googlesource.com/c/163080
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Adam Langley <agl@golang.org>

Prior to this change, DATA instructions accepted
the values 1, 2, 4, and 8 as sizes.
The acceptable sizes were further restricted
to 4 and 8 for float constants.

This was both too restrictive and not restrictive enough:
string constants may reasonably have any length,
and address constants should really only accept pointer-length sizes.

Fixes #30269

Change-Id: I06e44ecdf5909eca7b19553861aec1fa39655c2b
Reviewed-on: https://go-review.googlesource.com/c/163747
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>

These are required when testing gccgo.

Change-Id: I6a81d7f4d48292c32a8b3b15ef44d859ab3aa26e
Reviewed-on: https://go-review.googlesource.com/c/163861
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Change-Id: Id2e57bc8e18e062f60c6ac8a58dc15e049352088
GitHub-Last-Rev: 6d33b809cf8a3b5412333b1c3cc237000be8101d
GitHub-Pull-Request: golang/go#30016
Reviewed-on: https://go-review.googlesource.com/c/160440
Run-TryBot: Mikio Hara <mikioh.public.networking@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Mikio Hara <mikioh.public.networking@gmail.com>

Updates #15228.

Change-Id: I1b73defccb4c933d71c408aa31d32af9d1bc4ab8
Reviewed-on: https://go-review.googlesource.com/c/163357Reviewed-by: Matt Layher <mdlayher@gmail.com>

Fix the punctuation and use the proper units for microseconds,
while explaining the incorrect but common variant 'us'.

Change-Id: I9e96694ef27ab4761efccd8616ac7b6700f60d39
Reviewed-on: https://go-review.googlesource.com/c/163917Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Consistent logic for handling both duplicate map keys and case values,
and eliminates ad hoc value hashing code.

Also makes cmd/compile consistent with go/types's handling of
duplicate constants (see #28085), which is at least an improvement
over the status quo even if we settle on something different for the
spec.

As a side effect, this also suppresses cmd/compile's warnings about
duplicate nils in (non-interface expression) switch statements, which
was technically never allowed by the spec anyway.

Updates #28085.
Updates #28378.

Change-Id: I176a251e770c3c5bc11c2bf8d1d862db8f252a17
Reviewed-on: https://go-review.googlesource.com/c/152544
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>

CL 142497 renamed "statictmp_N" to ".stmp_N", but missed an instance
that was added by CL 151498 (submitted between the window that CL
142497 was reviewed/tested and later rebased/merged).

Change-Id: I597ee59dfa40821c7af2881b47e06f84a8140ec8
Reviewed-on: https://go-review.googlesource.com/c/163877
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

If the variables passed in to the cofactor arguments of GCD (x, y)
aliased the input arguments (a, b), the previous implementation would
result in incorrect results for y.  This change reorganizes the calculation
so that the only case that need to be handled is when y aliases b, which
can be handled with a simple check.

Tests were added for all of the alias cases for input arguments and and
and irrelevant test case for a previous binary GCD calculation was dropped.

Fixes #30217

Change-Id: Ibe6137f09b3e1ae3c29e3c97aba85b67f33dc169
Reviewed-on: https://go-review.googlesource.com/c/162517
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

The current ExampleCommentMap might panic if there are more satisfied
comments in the parsed program.

Change-Id: Ibe6943470aa0cfb450dae9fc07c1199acaabef73
GitHub-Last-Rev: c79e98c2868179ea47618b296ce28c5eebc0b99d
GitHub-Pull-Request: golang/go#28587
Reviewed-on: https://go-review.googlesource.com/c/147359
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>

This change limits the capacity of the slices of bytes returned by:

- Find
- FindAll
- FindAllSubmatch

to be the same as their length.

Fixes #30169

Change-Id: I07b632757d2bfeab42fce0d42364e2a16c597360
Reviewed-on: https://go-review.googlesource.com/c/161877Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

This will need to be updated from time to time as new targets are
added to gccgo. But that is better than always returning nil.

Change-Id: I04b8c4d0f8efa38e2a148eb2e38b16b09f0351c3
Reviewed-on: https://go-review.googlesource.com/c/158844
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Alan Donovan <adonovan@google.com>
Reviewed-by: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Set element in slice to nil avoiding memory leak.

Change-Id: I9dbef9a0466407011e326725d3a0b681cd815389
GitHub-Last-Rev: 1bae5d375876a7f146eb04c2a5ba88d079264eb3
GitHub-Pull-Request: golang/go#30386
Reviewed-on: https://go-review.googlesource.com/c/163601
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>

This makes the tests slightly faster, though the bulk of the time is
still spent building the test programs.

Also run some tests in parallel.

Updates #26470

Change-Id: Ia5ec2b99831d69c426b43dbab80613aa03e705f5
Reviewed-on: https://go-review.googlesource.com/c/153258Reviewed-by: Austin Clements <austin@google.com>

Updates https://gcc.gnu.org/PR89406

Change-Id: Iccf2760e42e9caa90720b96e74a805a9c0d48f35
Reviewed-on: https://go-review.googlesource.com/c/163277
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Mikio Hara <mikioh.public.networking@gmail.com>
Reviewed-by: Than McIntosh <thanm@google.com>

Fixes #30400

Change-Id: Icbd1dda29562afa80c8e37657133a6fe48070ac0
Reviewed-on: https://go-review.googlesource.com/c/163744Reviewed-by: Rob Pike <r@golang.org>

Change-Id: Ia0847790a597c35ebb572db6fc1b7534ecf8f006
GitHub-Last-Rev: 03f039d0abbce0e2a2bf15201948e46354950a22
GitHub-Pull-Request: golang/go#30022
Reviewed-on: https://go-review.googlesource.com/c/160446Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Change-Id: Iaa0e1721996b582bba9509c083755e1f125abb6b
GitHub-Last-Rev: c9b13ec0cdc2b22aafa54706dc6df6113a11712b
GitHub-Pull-Request: golang/go#29996
Reviewed-on: https://go-review.googlesource.com/c/160420
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>

Also store 64-bit data in lib/time/zoneinfo.zip.

The comments argue that we don't need the 64-bit data until 2037 or
2106, but that turns out not to be the case. We also need them for
dates before December 13, 1901, which is time.Unix(-0x80000000, 0).

Fixes #30099

Change-Id: Ib8c9efb29b7b3c08531ae69912c588209d6320e9
Reviewed-on: https://go-review.googlesource.com/c/161202Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Emit &runtime.zerobase instead of a call to newobject for
allocations of zero sized objects in walk.go.

Fixes #29446

Change-Id: I11b67981d55009726a17c2e582c12ce0c258682e
Reviewed-on: https://go-review.googlesource.com/c/155840
Run-TryBot: Iskander Sharipov <quasilyte@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Keith Randall <khr@golang.org>