Adjust Thearch.FREG_MIN/MAX when using non sse2 mode in 8g.

Also, gc.Use_sse is treated as a bool, so make it a bool.

Change-Id: I840411605344bb31c32f492b3e6729166c084f0c
Reviewed-on: https://go-review.googlesource.com/7993Reviewed-by: Aram Hăvărneanu <aram@mgk.ro>
Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Dave Cheney <dave@cheney.net>
Run-TryBot: Dave Cheney <dave@cheney.net>

- handle exponent over- and underflow
- handle denormalized numbers
- added test cases

Change-Id: I1bbb9904b0c104f54696944e1f57559881f6eeeb
Reviewed-on: https://go-review.googlesource.com/7982Reviewed-by: Alan Donovan <adonovan@google.com>

Change-Id: Id1edbed38c94e7c1c13a0200c44edf2b9ae5f087
Reviewed-on: https://go-review.googlesource.com/8040Reviewed-by: David Crawshaw <crawshaw@golang.org>

Also fixes a long-existing problem in the fork/exec path.

Change-Id: Idec40b1cee0cfb1625fe107db3eafdc0d71798f2
Reviewed-on: https://go-review.googlesource.com/8030Reviewed-by: Minux Ma <minux@golang.org>
Reviewed-by: Rob Pike <r@golang.org>

REGRT1 and REGRT2 are also reserved on arm64 for runtime (duffzero
and duffcopy).

Change-Id: If098527a7f29d16f94bdcec05fd55950b9076e35
Signed-off-by: Shenghou Ma <minux@golang.org>
Reviewed-on: https://go-review.googlesource.com/7977Reviewed-by: Aram Hăvărneanu <aram@mgk.ro>
Reviewed-by: Dave Cheney <dave@cheney.net>
Reviewed-by: Rob Pike <r@golang.org>

Fixes newly introduced test on linux/arm64 because linux/arm64 doesn't
have the getpgrp syscall. Getpgid(0) is documented to be equivalent to
Getpgrp.

Change-Id: I8f30f4f8de8c32fe04a29c9c4a9330d4e4e6b46d
Signed-off-by: Shenghou Ma <minux@golang.org>
Reviewed-on: https://go-review.googlesource.com/8022Reviewed-by: Aram Hăvărneanu <aram@mgk.ro>
Reviewed-by: Rob Pike <r@golang.org>

Previously the extra m needed for cgo callbacks was created on the
first callback. This works for cgo, however the cgocallback mechanism
is also borrowed by badsignal which can run before any cgo calls are
made.

Now we initialize the extra M at runtime startup before any signal
handlers are registered, so badsignal cannot be called until the
extra M is ready.

Updates #10207.

Change-Id: Iddda2c80db6dc52d8b60e2b269670fbaa704c7b3
Reviewed-on: https://go-review.googlesource.com/7978Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: David Crawshaw <crawshaw@golang.org>

Change-Id: I5bfeeef53665b1ef79ec0e4a6ae0eb4aa3e95603
Signed-off-by: Shenghou Ma <minux@golang.org>
Reviewed-on: https://go-review.googlesource.com/8021Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

There are calls to stdcall when the GC thinks the world is stopped
and stdcall write a *g for the CPU profiler. This produces a write
barrier but the GC is not prepared to deal with write barriers when
it thinks the world is stopped. Since the g is on allg it does not
need a write barrier to keep it alive so eliminate the write barrier.

Change-Id: I937633409a66553d7d292d87d7d58caba1fad0b6
Reviewed-on: https://go-review.googlesource.com/7979Reviewed-by: Austin Clements <austin@google.com>
Run-TryBot: Rick Hudson <rlh@golang.org>

The test is a simple reproduction of issue 9356.

Update #8948.
Update #9356.

Change-Id: Ia77bc36d12ed0c3c4a8b1214cade8be181c9ad55
Reviewed-on: https://go-review.googlesource.com/7618Reviewed-by: Minux Ma <minux@golang.org>

Change-Id: I2d2ea233f976aab3f356f9b508cdd246d5013e33
Signed-off-by: Shenghou Ma <minux@golang.org>
Reviewed-on: https://go-review.googlesource.com/7537

Change-Id: I2d2ea233f976aab3f356f9b508cdd246d5013e32
Signed-off-by: Shenghou Ma <minux@golang.org>
Reviewed-on: https://go-review.googlesource.com/7536Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Fixes #4069.

Change-Id: I2d2ea233f976aab3f356f9b508cdd246d5013e31
Signed-off-by: Shenghou Ma <minux@golang.org>
Reviewed-on: https://go-review.googlesource.com/7535Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>

Change-Id: I2d2ea233f976aab3f356f9b508cdd246d5013e30
Signed-off-by: Shenghou Ma <minux@golang.org>
Reviewed-on: https://go-review.googlesource.com/7534Reviewed-by: Ian Lance Taylor <iant@golang.org>

Signed-off-by: Shenghou Ma <minux@golang.org>
Change-Id: I2d2ea233f976aab3f356f9b508cdd246d5013e2f
Reviewed-on: https://go-review.googlesource.com/7284Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>

Update #4069: this CL fixes the issue on windows/386.
Signed-off-by: Shenghou Ma <minux@golang.org>
Change-Id: I2d2ea233f976aab3f356f9b508cdd246d5013e2e
Reviewed-on: https://go-review.googlesource.com/7283Reviewed-by: Ian Lance Taylor <iant@golang.org>

windows/386 also wants underscore prefix for external names.
This CL is in preparation of external linking support.

Change-Id: I2d2ea233f976aab3f356f9b508cdd246d5013e2d
Signed-off-by: Shenghou Ma <minux@golang.org>
Reviewed-on: https://go-review.googlesource.com/7282Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>

When external linking, we must link to implib provided by mingw, so we must use
properly decorated names for stdcalls.

Because the feature is only used in the runtime, I've designed a new decoration
scheme so that we can use the same decorated name for both 386 and amd64.

A stdcall function named FooEx from bar16.dll which takes 3 parameters will be
imported like this:
	//go:cgo_import_dynamic runtime._FooEx FooEx%3 "bar16.dll"
Depending on the size of uintptr, the linker will later transform it to _FooEx@12
or _FooEx@24.

This is in prepration for the next CL that adds external linking support for
windows/386.

Change-Id: I2d2ea233f976aab3f356f9b508cdd246d5013e2c
Signed-off-by: Shenghou Ma <minux@golang.org>
Reviewed-on: https://go-review.googlesource.com/7163Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Update #10215.

Change-Id: Ib588f90279a4ef5461492553d50ad77c742b3560
Signed-off-by: Shenghou Ma <minux@golang.org>
Reviewed-on: https://go-review.googlesource.com/7971Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>

This is in preparation for inlining the color.YCbCrToRGB calls in a
follow-up change.

Change-Id: I30750ace11a8ef6016b3c1e0b4bfdbcc8151f9a5
Reviewed-on: https://go-review.googlesource.com/7951Reviewed-by: Rob Pike <r@golang.org>

The debug/dwarf and encoding/asn1 examples were added in 2009, a few
months before Go added implicit semicolons, and never updated.

The go/ast node types have always been named just "Expr", "Stmt", and
"Decl", so the comments about "ExprNode", "StmtNode", and "DeclNode"
were likely just mistaken because the interface tag methods are
"exprNode", "stmtNode", and "declNode", respectively.

Change-Id: I9d138cc3a16c1a51453da1406914d7b320bf6270
Reviewed-on: https://go-review.googlesource.com/7980Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Instead of reimplementing chained hash tables, just use maps.

Use bool instead of uint8 for variables only set to 0 or 1.

Fix parsing of `import foo "foo" // indirect` lines.  Previously, this
was treated as an import of package path `"foo" // indirect`, which
could result in the cycle-detection code failing to detect a cycle
because it would be treated as a separate package from `"foo"`.

Also, since there are theoretically multiple quoted forms for a
package path, use strconv.Unquote to normalize them.  Side benefit:
Unquote will complain if any trailing comments sneak back in.

Aside: For most Go archives, Go package data is only present in the
__.PKGDEF member, but unless -u is used, ldpkg is only called on the
_go_.6 member.  Consequently, importcycles is a no-op when -u isn't
used as it has no package data to inspect.

Change-Id: I7076cf91a66726a8d9c5676adfea13c5532001fa
Reviewed-on: https://go-review.googlesource.com/7002Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Rob Pike <r@golang.org>

The imageutil.DrawYCbCr function lives in an internal package because it
is needed by both the image/draw and image/jpeg packages, but it doesn't
seem right for one of those two to depend on the other.

It could eventually go into the image package, but that would require
committing to an API for the rest of Go 1.x.

Change-Id: I7b12555c970d86409365e99eef9360702aaffa30
Reviewed-on: https://go-review.googlesource.com/7925Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Rob Pike <r@golang.org>

Previously, running 'go get' with a local path would correctly
download the package but fail to install it.
This is because a sticky error - resulting from discovering that the
package needed to be downloaded - was still around.
Theoretically, such sticky errors would be cleared but they weren't
because the map tracking these errors were indexed with the correct
canonical import path of the package (e.g. "ex.com/x/pkg") whereas the
clearing was done with the local path (e.g. "./pkg".)

Always use the canonical import path.

Fixes #9767

Change-Id: Ia0e8a51ac591d4c833d11285da5b767ef7ed8ad2
Reviewed-on: https://go-review.googlesource.com/6266Reviewed-by: Rob Pike <r@golang.org>

Fixes #10224

Change-Id: I21037379b4667575e51ab0b6b683138c505c3f68
Reviewed-on: https://go-review.googlesource.com/7960Reviewed-by: David Crawshaw <crawshaw@golang.org>

Change-Id: I4d35a96ace71b68a91561c08fd7331859d9dd19d
Reviewed-on: https://go-review.googlesource.com/5593Reviewed-by: Dmitry Vyukov <dvyukov@google.com>

Change-Id: Ie45d45649ea978becf84eb911cf4ace1dd237d9e
Reviewed-on: https://go-review.googlesource.com/7918Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Change-Id: Ib8df771957f9a5bf00bee7eb8cb361d4acd5813f
Reviewed-on: https://go-review.googlesource.com/7911Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

This test was introduced in cl/5130 and broke the darwin/arm builder.

Also check some errors, which was making the failure hard to decipher.

Change-Id: Ifb1d60b9971782cf8d2e979d83f8a81249d7ee9b
Reviewed-on: https://go-review.googlesource.com/7932Reviewed-by: Rob Pike <r@golang.org>

Since there is internal usage of svg files in cmd/trace served via
HTTP, add it to the (small) map of mime types.

MIME type as documented at http://www.w3.org/TR/SVG11/mimereg.html

Change-Id: If14f07cbe2e55d8d68af663f30920a530e2e7974
Reviewed-on: https://go-review.googlesource.com/7942Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>

This is a port of RE2's bitstate backtracker, which triggers under
the same conditions that the RE2 backtracker triggers.  However I wasn't
sure how to port over some of the optimizations in the RE2 backtracker,
and there is a ~2% penalty on benchmarks that don't trigger the backtracker.

benchmark                                 old ns/op      new ns/op      delta
BenchmarkLiteral                          312            189            -39.42%
BenchmarkNotLiteral                       4435           3001           -32.33%
BenchmarkMatchClass                       5758           4378           -23.97%
BenchmarkMatchClass_InRange               5385           4084           -24.16%
BenchmarkReplaceAll                       5291           3505           -33.76%
BenchmarkAnchoredLiteralShortNonMatch     190            200            +5.26%
BenchmarkAnchoredLiteralLongNonMatch      189            194            +2.65%
BenchmarkAnchoredShortMatch               479            304            -36.53%
BenchmarkAnchoredLongMatch                478            499            +4.39%
BenchmarkOnePassShortA                    791            798            +0.88%
BenchmarkNotOnePassShortA                 3202           1571           -50.94%
BenchmarkOnePassShortB                    614            633            +3.09%
BenchmarkNotOnePassShortB                 2685           881            -67.19%
BenchmarkOnePassLongPrefix                152            154            +1.32%
BenchmarkOnePassLongNotPrefix             505            533            +5.54%
BenchmarkMatchEasy0_32                    139            171            +23.02%
BenchmarkMatchEasy0_1K                    653            1797           +175.19%
BenchmarkMatchEasy0_32K                   12032          13346          +10.92%
BenchmarkMatchEasy0_1M                    462882         461272         -0.35%
BenchmarkMatchEasy0_32M                   15015339       15365238       +2.33%
BenchmarkMatchEasy1_32                    122            168            +37.70%
BenchmarkMatchEasy1_1K                    3339           2612           -21.77%
BenchmarkMatchEasy1_32K                   72330          71721          -0.84%
BenchmarkMatchEasy1_1M                    2545410        2652284        +4.20%
BenchmarkMatchEasy1_32M                   80072063       82609750       +3.17%
BenchmarkMatchMedium_32                   2359           1980           -16.07%
BenchmarkMatchMedium_1K                   75939          58593          -22.84%
BenchmarkMatchMedium_32K                  2450907        2501106        +2.05%
BenchmarkMatchMedium_1M                   78707697       80174418       +1.86%
BenchmarkMatchMedium_32M                  2535146010     2570896441     +1.41%
BenchmarkMatchHard_32                     4297           2960           -31.11%
BenchmarkMatchHard_1K                     133592         88997          -33.38%
BenchmarkMatchHard_32K                    4240445        4336907        +2.27%
BenchmarkMatchHard_1M                     136187006      139350238      +2.32%
BenchmarkMatchHard_32M                    4350855890     4478537306     +2.93%

benchmark                    old MB/s     new MB/s     speedup
BenchmarkMatchEasy0_32       228.74       186.11       0.81x
BenchmarkMatchEasy0_1K       1565.91      569.64       0.36x
BenchmarkMatchEasy0_32K      2723.31      2455.10      0.90x
BenchmarkMatchEasy0_1M       2265.32      2273.22      1.00x
BenchmarkMatchEasy0_32M      2234.68      2183.79      0.98x
BenchmarkMatchEasy1_32       261.08       190.22       0.73x
BenchmarkMatchEasy1_1K       306.59       391.91       1.28x
BenchmarkMatchEasy1_32K      453.03       456.88       1.01x
BenchmarkMatchEasy1_1M       411.95       395.35       0.96x
BenchmarkMatchEasy1_32M      419.05       406.18       0.97x
BenchmarkMatchMedium_32      13.56        16.16        1.19x
BenchmarkMatchMedium_1K      13.48        17.48        1.30x
BenchmarkMatchMedium_32K     13.37        13.10        0.98x
BenchmarkMatchMedium_1M      13.32        13.08        0.98x
BenchmarkMatchMedium_32M     13.24        13.05        0.99x
BenchmarkMatchHard_32        7.45         10.81        1.45x
BenchmarkMatchHard_1K        7.67         11.51        1.50x
BenchmarkMatchHard_32K       7.73         7.56         0.98x
BenchmarkMatchHard_1M        7.70         7.52         0.98x
BenchmarkMatchHard_32M       7.71         7.49         0.97x

Fixes #4154

Change-Id: Iff7fb9507f0872b320d08afc08679751ed1b28bc
Reviewed-on: https://go-review.googlesource.com/2153Reviewed-by: Russ Cox <rsc@golang.org>

On Unix, when placing a child in a new process group, allow that group
to become the foreground process group. Also, allow a child process to
join a specific process group.

When setting the foreground process group, Ctty is used as the file
descriptor of the controlling terminal. Ctty has been added to the BSD
and Solaris SysProcAttr structures and the handling of Setctty changed
to match Linux.

Change-Id: I18d169a6c5ab8a6a90708c4ff52eb4aded50bc8c
Reviewed-on: https://go-review.googlesource.com/5130
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Issue #10043 was resolved by https://golang.org/cl/7072.
This test now passes.

Change-Id: I7bdef63d9ee4edcede23613a14a2ddce14018f34
Reviewed-on: https://go-review.googlesource.com/7931Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Fixes #10214.

Change-Id: If29d26c590eb53d4976e0a6ace0ed33aaf0c3e80
Reviewed-on: https://go-review.googlesource.com/7924Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>

ServeContent ignored zero time.Time{} values when generating
Last-Modified response headers and checking If-Modified-Since request
headers. Do the same for a time.Time representing the Unix epoch zero
value, as this is a common bogus value. Callers who really want to
send that value (incredibly unlikely) can add a nanosecond to it and
it will be truncated to second granularity anyway.

Fixes #9842

Change-Id: I69f697bfc4017404a92a34e3fe57e2711c1e299d
Reviewed-on: https://go-review.googlesource.com/7915Reviewed-by: David Symonds <dsymonds@golang.org>

Change-Id: I9968f53a8286a0e5ccc197a9b5fae499e2f95326
Reviewed-on: https://go-review.googlesource.com/7790Reviewed-by: Rob Pike <r@golang.org>

Change-Id: I5b057d16eed1b364e608ff0fd74de323da6492bc
Reviewed-on: https://go-review.googlesource.com/7679Reviewed-by: Minux Ma <minux@golang.org>

Implement runtime.atomicand8 for amd64p32 which was overlooked
in CL 7861.

Change-Id: Ic7eccddc6fd6c4682cac1761294893928f5428a2
Reviewed-on: https://go-review.googlesource.com/7920Reviewed-by: Minux Ma <minux@golang.org>

      to map element keys

Composite literals containing element values that are themselves composite
literals may leave away the element's literal types if they are identical
to the enclosing composite literal's element type.

(http://golang.org/ref/spec#Composite_literals)

When we made this change, we forgot to apply the analogous rule to map
literal keys. This change generalizes that rule. Added more examples,
including one showing the recursive application of the elision rules.

This is a fully backward-compatible language change. It was discussed
some time back.

Fixes #8589.

To be submitted once all compilers accept the extension.

Change-Id: I4d45b64b5970f0d5501572945d5a097e64a9458b
Reviewed-on: https://go-review.googlesource.com/2591Reviewed-by: Russ Cox <rsc@golang.org>
Reviewed-by: Rob Pike <r@golang.org>

Change-Id: I5e11a76ebb20284618144be2ef5449d3202b6222
Reviewed-on: https://go-review.googlesource.com/7900Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>