Commits · e85265e8c2a41e4a0e703e5fb6fe762cc382d0af · Kirill Smelkov / go

16 Aug, 2016 40 commits

cmd/compile: optimize bool to int conversion · e85265e8

Josh Bleecher Snyder authored May 02, 2016

This CL teaches SSA to recognize code of the form

// b is a boolean value, i is an int of some flavor
if b {
	i = 1
} else {
	i = 0
}

and use b's underlying 0/1 representation for i
instead of generating jumps.

Unfortunately, it does not work on the obvious code:

func bool2int(b bool) int {
	if b {
		return 1
	}
	return 0
}

This is left for future work.
Note that the existing phiopt optimizations also don't work for:

func neg(b bool) bool {
	if b {
		return false
	}
	return true
}

In the meantime, runtime authors and the like can use:

func bool2int(b bool) int {
	var i int
	if b {
		i = 1
	} else {
		i = 0
	}
	return i
}

This compiles to:

"".bool2int t=1 size=16 args=0x10 locals=0x0
	0x0000 00000 (x.go:25)	TEXT	"".bool2int(SB), $0-16
	0x0000 00000 (x.go:25)	FUNCDATA	$0, gclocals·23e8278e2b69a3a75fa59b23c49ed6ad(SB)
	0x0000 00000 (x.go:25)	FUNCDATA	$1, gclocals·33cdeccccebe80329f1fdbee7f5874cb(SB)
	0x0000 00000 (x.go:32)	MOVBLZX	"".b+8(FP), AX
	0x0005 00005 (x.go:32)	MOVBQZX	AL, AX
	0x0008 00008 (x.go:32)	MOVQ	AX, "".~r1+16(FP)
	0x000d 00013 (x.go:32)	RET

The extraneous MOVBQZX is #15300.

This optimization also helps range and slice.
The compiler must protect against pointers pointing
to the end of a slice/string. It does this by increasing
a pointer by either 0 or 1 * elemsize, based on a condition.
This CL optimizes away a jump in that code.

This CL triggers 382 times while compiling the standard library.

Updating code to utilize this optimization is left for future CLs.

Updates #6011

Change-Id: Ia7c1185f8aa223c543f91a3cd6d4a2a09c691c70
Reviewed-on: https://go-review.googlesource.com/22711
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e85265e8

cmd/compile: don't crash when exporting self-recursive interfaces · c7b9bd74

Robert Griesemer authored Jul 15, 2016

For #16369.

Change-Id: I4c9f5a66b95558adcc1bcface164b9b2b4382d2f
Reviewed-on: https://go-review.googlesource.com/24979Reviewed-by: Alan Donovan <adonovan@google.com>

c7b9bd74

reflect: clear tflag on new types · 56752eb2

David Crawshaw authored Aug 16, 2016

Fixes #16722

Change-Id: I50a0e69d3e79d13bc1860cd983267c3db087a4b8
Reviewed-on: https://go-review.googlesource.com/27119Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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56752eb2

cmd/compile: don't fold >32bit constants into a MULQ · d251030f

Keith Randall authored Aug 16, 2016

Don't fold constant factors into a multiply
beyond the capacity of a MULQ instruction (32 bits).

Fixes #16733

Change-Id: Idc213c6cb06f7c94008a8cf9e60a9e77d085fd89
Reviewed-on: https://go-review.googlesource.com/27160
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d251030f

cmd/compile: inline _, ok = i.(T) · 562d06fc

Josh Bleecher Snyder authored Jun 06, 2016

We already inlined

_, ok = e.(T)
_, ok = i.(E)
_, ok = e.(E)

The only ok-only variants not inlined are now

_, ok = i.(I)
_, ok = e.(I)

These call getitab, so are non-trivial.

Change-Id: Ie45fd8933ee179a679b92ce925079b94cff0ee12
Reviewed-on: https://go-review.googlesource.com/26658
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562d06fc

cmd/internal/obj: convert Aconv to a stringer · e6e26eeb

Michael Pratt authored Jul 18, 2016

Now that assembler opcodes have their own type, they can have a true
stringer, rather than explicit calls to Aconv, which makes for nicer
format strings.

Change-Id: Ic77f5f8ac38b4e519dcaa08c93e7b732226f7bfe
Reviewed-on: https://go-review.googlesource.com/25045
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e6e26eeb

cmd/compile/internal/big: re-vendor · 5693bee0

Josh Bleecher Snyder authored Jul 07, 2016

Pick up a bunch of changes and fixes.

Change-Id: If4101f7185d433a4c89096bc786ee5de8eeabac0
Reviewed-on: https://go-review.googlesource.com/27123
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5693bee0

runtime: move printing of extra newline · 6f74c077

Josh Bleecher Snyder authored Jul 11, 2016

No functional changes, makes vet happy.

Updates #11041

Change-Id: I59f3aba46d19b86d605508978652d76a1fe7ac7b
Reviewed-on: https://go-review.googlesource.com/27125
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6f74c077

net/http: use keyed composite literal · 297d1d73

Josh Bleecher Snyder authored Jul 09, 2016

Makes vet happy.

Updates #11041

Change-Id: I23ca413c03ff387359440af8114786cd7880a048
Reviewed-on: https://go-review.googlesource.com/27124
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297d1d73

crypto/cipher, math/big: fix example names · 302dd7b7

Josh Bleecher Snyder authored Jul 09, 2016

Fixes (legit) vet warnings.
Fix some verb tenses while we're here.

Updates #11041

Change-Id: I27e995f55b38f4cf584e97a67b8545e8247e83d6
Reviewed-on: https://go-review.googlesource.com/27122
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302dd7b7

crypto/tls: fix WriteTo method signature · 6d2db098

Josh Bleecher Snyder authored Jul 09, 2016

Give *recordingConn the correct WriteTo signature
to be an io.WriterTo. This makes vet happy.
It also means that it'll report errors,
which were previously being ignored.

Updates #11041

Change-Id: I13f171407d63f4b62427679bff362eb74faddca5
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6d2db098

net: change t.Error to t.Errorf · 12292754

Josh Bleecher Snyder authored Jul 07, 2016

Caught by vet.

Updates #11041

Change-Id: I4dbb2eeaf633eea5976074840064edc2349e01d8
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12292754

container/list: silence vet warnings · 88858fa5

Josh Bleecher Snyder authored Jun 30, 2016

container/list/list_test.go:274: self-assignment of e1 to e1
container/list/list_test.go:274: self-assignment of e4 to e4
container/list/list_test.go:282: self-assignment of e1 to e1
container/list/list_test.go:286: self-assignment of e1 to e1
container/list/list_test.go:286: self-assignment of e4 to e4

Updates #11041

Change-Id: Ibd90cf6a924e93497908f437b814c3fc82937f4a
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88858fa5

cmd/compile: remove nil check in accessing PAUTOHEAP variable · 4c4ca831

Cherry Zhang authored Aug 11, 2016

CL 23393 introduces PAUTOHEAP, and access of PAUTOHEAP variable is
rewritten to indirection of a PAUTO variable. Mark this variable
non-nil, so this indirection does not introduce extra nil checks.

Change-Id: I31853eed5e60238b6c5bc0546e2e9ab340dcddd9
Reviewed-on: https://go-review.googlesource.com/26831
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4c4ca831

all: fix "result not used" vet warnings · 40cf4ad0

Josh Bleecher Snyder authored Jul 07, 2016

For tests, assign to _.
For benchmarks, assign to a sink.

Updates #11041

Change-Id: I87c5543245c7bc74dceb38902f4551768dd37948
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40cf4ad0

cmd/compile: fix bad generated format strings in test · c70bdd37

Josh Bleecher Snyder authored Jun 30, 2016

We were generating format strings containing
a lone %. Vet legitimately complains:

cmd/compile/internal/gc/constFold_test.go:339: unrecognized printf verb ' '

The fix doesn't make for very readable code,
but it is simple and obviously correct.

Updates #11041

Change-Id: I90bd2d1d140887f5229752a279f7e46921472fbb
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c70bdd37

syscall: unify unix/amd64 asm implementations · 2cbe7353

Josh Bleecher Snyder authored Jul 21, 2016

Updates #11041

Change-Id: I77e5ca0b61ffc530ee46848721a177867c81d548
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2cbe7353

syscall: split out unix Syscall9 asm support · a5464af5

Josh Bleecher Snyder authored Jul 21, 2016

This is preliminary work to unifying them.
Aside from Syscall9, all are identical.
Syscall9 has a netbsd/openbsd variant
and a dragonfly/freebsd variant.

Updates #11041

Change-Id: Ia5ce95d5e9115d4c0492d5e53aa7a4316deafd1f
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a5464af5

syscall: superficial cleanup of amd64 unix assembly · 33f95ec4

Josh Bleecher Snyder authored Jul 21, 2016

This is preliminary work to unifying them.

Updates #11041

Change-Id: Ibe83da3d626f1da9e8888e26cedd3af2152b42e6
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33f95ec4

syscall: fix dragonfly/amd64 assembly argument sizes · 856342d8

Josh Bleecher Snyder authored Jul 21, 2016

This is preliminary work to unifying the
unix amd64 assembly implementations,
which is preliminary work to making the
assembly vet-friendly.

Updates #11041

Change-Id: Ic64985124f8fb86cc08898be2ec7fca972ced4ca
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856342d8

syscall: unify unix 386 implementations · b173298c

Josh Bleecher Snyder authored Jul 21, 2016

They were identical.

This will allow us to do the TODO at the top
of the file only once.

Updates #11041

Change-Id: I07aaca27ae46b66b65780082988bdc7546ed534b
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b173298c

cmd/compile: disable Duff's device on darwin/arm64 · 1e94d79f

Cherry Zhang authored Aug 16, 2016

Darwin linker does not support BR26 reloc with non-zero addend.

Fixes #16724.

Change-Id: I1b5b4dc7159141bde3e273490f435c08c583afaf
Reviewed-on: https://go-review.googlesource.com/27081
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1e94d79f

net/http: make Transport retry non-idempotent requests if no bytes written · 6fd2d2cf

Brad Fitzpatrick authored Aug 16, 2016

If the server failed on us before we even tried to write any bytes,
it's safe to retry the request on a new connection, regardless of the
HTTP method/idempotence.

Fixes #15723

Change-Id: I25360f82aac530d12d2b3eef02c43ced86e62906
Reviewed-on: https://go-review.googlesource.com/27117Reviewed-by: Andrew Gerrand <adg@golang.org>
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6fd2d2cf

cmd/compile: reduce garbage from autolabel · fe27291c

Josh Bleecher Snyder authored Aug 15, 2016

Follow-up to CL 26661

Change-Id: I67c58d17313094675cf0f30ce50d486818ae0dcb
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fe27291c

archive/tar: preallocate slice from paxHeaders · 77e68ea7

Gyu-Ho Lee authored Jun 04, 2016

Preallocate keys slice with the length of paxHeaders map
to prevent slice growth with append operations.

Change-Id: Ic9a927c4eaa775690a4ef912d61dd06f38e11510
Reviewed-on: https://go-review.googlesource.com/23782Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
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77e68ea7

crypto/tls: gofmt -w -s · 2cb471e4

Mikio Hara authored Jun 28, 2016

Change-Id: Iedf9000e3bb1fa73b4c3669eae846e85f1f5fdfe
Reviewed-on: https://go-review.googlesource.com/24489
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2cb471e4

net/http: deflake BenchmarkClient and its use of a fixed port for testing · 5a59516d

Brad Fitzpatrick authored Aug 15, 2016

Let the kernel pick a port for testing, and have the server in the
child process tell the parent (benchmarking) process the port that
was selected.

Fixes flakes like seen in https://golang.org/cl/27050 (and previously)

Change-Id: Ia2b705dc4152f70e0a5725015bdae09984d09d53
Reviewed-on: https://go-review.googlesource.com/27051
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5a59516d

go/token: Fix race in FileSet.PositionFor. · 52fcff3e

Jan Mercl authored Aug 02, 2016

Methods of FileSet are documented to be safe for concurrent use by
multiple goroutines, so FileSet is protected by a mutex and all its
methods use it to prevent concurrent mutations. All methods of File that
mutate the respective FileSet, including AddLine, do also lock its
mutex, but that does not help when PositionFor is invoked concurrently
and reads without synchronization what AddLine mutates.

The change adds acquiring a RLock around the racy call of File.position
and the respective test.

Fixes #16548

Change-Id: Iecaaa02630b2532cb29ab555376633ee862315dd
Reviewed-on: https://go-review.googlesource.com/25345Reviewed-by: Robert Griesemer <gri@golang.org>
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52fcff3e

bytes: add examples · 14e446d9

Carlos C authored Jul 20, 2016

`bytes` and `strings` are pretty similar to each other, this commit
brings `strings` examples to its counter-part.

Partially addresses #16360

Change-Id: I551320eaa78be9df69012035f1c3333f500e04c9
Reviewed-on: https://go-review.googlesource.com/25062Reviewed-by: Andrew Gerrand <adg@golang.org>
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14e446d9

doc: add 1.7 to golang.org/project · 35f5517c

Chris Broadfoot authored Aug 15, 2016

Change-Id: Ib17f6643efd49e2bca188c4faa505f79832d18b1
Reviewed-on: https://go-review.googlesource.com/27110Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

35f5517c

os/exec: fix nit found by vet · 7c31043c

Mikio Hara authored Aug 16, 2016

Change-Id: I8085ed43d63215237a4871cc1e44257132a7f5de
Reviewed-on: https://go-review.googlesource.com/27130Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

7c31043c

container/heap: remove one unnecessary comparison in Fix · b98d8cd5

Sina Siadat authored Jun 21, 2016

The heap.Fix function calls both down and up.  If the element is moved
down, we don't need to call up and we could save a comparison.

(per suggestion by Radu Berinde)

Fixes #16098.

Change-Id: I83a74710e66cf0d274d8c0743338c26f89f31afe
Reviewed-on: https://go-review.googlesource.com/24273Reviewed-by: Robert Griesemer <gri@golang.org>

b98d8cd5

cmd/link: when dynlinking, do not mangle short symbol names · b5e43e66

Michael Hudson-Doyle authored Aug 12, 2016

When dynamically linking, a type symbol's name is replaced with a name based on
the SHA1 of the name as type symbol's names can be very long.  However, this
can make a type's symbol name longer in some cases. So skip it in that case.
One of the symbols this changes the treatment of is 'type.string' and that fixes a
bug where -X doesn't work when dynamically linking.

Fixes #16671

Change-Id: If5269038261b76fb0ec52e25a9c1d64129631e3c
Reviewed-on: https://go-review.googlesource.com/26890
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b5e43e66

strings: add special cases for Join of 2 and 3 strings · 3ddc9ad9

Brad Fitzpatrick authored Jul 18, 2016

We already had special cases for 0 and 1. Add 2 and 3 for now too.
To be removed if the compiler is improved later (#6714).

This halves the number of allocations and total bytes allocated via
common filepath.Join calls, improving filepath.Walk performance.

Noticed as part of investigating filepath.Walk in #16399.

Change-Id: If7b1bb85606d4720f3ebdf8de7b1e12ad165079d
Reviewed-on: https://go-review.googlesource.com/25005Reviewed-by: Ian Lance Taylor <iant@golang.org>
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3ddc9ad9

cmd/internal/obj: add generated String method for AddrType · c88e8680

Josh Bleecher Snyder authored Jun 07, 2016

Generated with:

stringer -type AddrType cmd/internal/obj

Change-Id: I74509cffab774035c5ca2ac0634638d73dbd33f3
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c88e8680

cmd/compile: move auto label gen variables to local function · a9ed4773

Josh Bleecher Snyder authored Jun 01, 2016

This still depends on Curfn, but it's progress.

Updates #15756

Change-Id: Ic32fe56f44fcfbc023e7668d4dee07f8b47bf3a4
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a9ed4773

go/types: fix bad printf verbs · d94409d6

Josh Bleecher Snyder authored Jul 07, 2016

This fixes the following vet warnings:

go/types/builtins.go:437: arg call for printf verb %s of wrong type: *go/ast.CallExpr
go/types/builtins.go:598: arg call for printf verb %s of wrong type: *go/ast.CallExpr

Updates #11041

Change-Id: I746d054e8e49b330fbdf961912a98f55dd5f3ff9
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d94409d6

go/types: fix multiword data structure alignment on nacl · e0d8064e

Josh Bleecher Snyder authored Aug 07, 2016

Fixes #16464

Change-Id: Ibf5625c1b5fa3abd18623023f18664e8f81fa45a
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e0d8064e

encoding/json: add example for RawMessage marshalling · 7a974a4c

Carlos C authored Aug 10, 2016

Fixes #16648

Change-Id: I3ab21ab33ca3f41219de9518ac6a39f49131e5e5
Reviewed-on: https://go-review.googlesource.com/26692Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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7a974a4c

math/big: use array instead of slice for deBruijn lookups · 3357a02b

Josh Bleecher Snyder authored Jul 05, 2016

This allows the compiler to remove a bounds check.

math/big/nat.go:681: index bounds check elided
math/big/nat.go:683: index bounds check elided

Change-Id: Ieecb89ec5e988761b06764bd671672015cd58e9d
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3357a02b