We need to make sure that when we combine loads, we only do
so if there are no other uses of the load. We can't split
one load into two because that can then lead to inconsistent
loaded values in the presence of races.
Add some aggressive copy removal code so that phantom
"dead copy" uses of values are cleaned up promptly. This lets
us use x.Uses==1 conditions reliably.
Change-Id: I9037311db85665f3868dbeb3adb3de5c20728b38
Reviewed-on: https://go-review.googlesource.com/21853
Reviewed-by: Todd Neal <todd@tneal.org>
Make internal pprof packages available to cmd/trace.
cmd/trace needs access to them to generate symbolized
svg profiles (create and serialize Profile struct).
And potentially generate svg programmatically instead
of invoking go tool pprof.
Change-Id: Iafd0c87ffdd4ddc081093be0b39761f19507907a
Reviewed-on: https://go-review.googlesource.com/21870
Run-TryBot: Dmitry Vyukov <dvyukov@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
s390x does not require duffzero/duffcopy since it has
storage-to-storage instructions that can copy/clear up to 256
bytes at a time.
peep contains several new passes to optimize instruction
sequences that match s390x instructions such as the
compare-and-branch and load/store multiple instructions.
copyprop and subprop have been extended to work with moves that
require sign/zero extension. This work could be ported to other
architectures that do not used sized math however it does add
complexity and will probably be rendered unnecessary by ssa in
the near future.
Change-Id: I1b64b281b452ed82a85655a0df69cb224d2a6941
Reviewed-on: https://go-review.googlesource.com/20873
Run-TryBot: Michael Munday <munday@ca.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bill O'Farrell <billotosyr@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Apply golang/tools@5804fef4c0.
In the context of cmd/go build tool, import path is a '/'-separated path.
This can be inferred from `go help importpath` and `go help packages`.
vcsFromDir documentation says on return, root is the import path
corresponding to the root of the repository. On Windows and other
OSes where os.PathSeparator is not '/', that wasn't true since root
would contain characters other than '/', and therefore it wasn't a
valid import path corresponding to the root of the repository.
Fix that by using filepath.ToSlash.
Add test coverage for vcsFromDir, it was previously not tested.
It's taken from golang.org/x/tools/go/vcs tests, and modified to
improve style.
Additionally, remove an unneccessary statement from the documentation
"(thus root is a prefix of importPath)". There is no variable
importPath that is being referred to (it's possible p.ImportPath
was being referred to). Without it, the description of root value
matches the documentation of repoRoot.root struct field:
// root is the import path corresponding to the root of the
// repository
root string
Rename and change signature of vcsForDir(p *Package) to
vcsFromDir(dir, srcRoot string). This is more in sync with the x/tools
version. It's also simpler, since vcsFromDir only needs those two
values from Package, and nothing more. Change "for" to "from" in name
because it's more consistent and clear.
Update usage of vcsFromDir to match the new signature, and respect
that returned root is a '/'-separated path rather than a os.PathSeparator
separated path.
Fixes#15040.
Updates #7723.
Helps #11490.
Change-Id: Idf51b9239f57248739daaa200aa1c6e633cb5f7f
Reviewed-on: https://go-review.googlesource.com/21345
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Run-TryBot: Alex Brainman <alex.brainman@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Removes dynimport, dynexport, dynlinker cases since they can not
be reached due to prefix check for "go:cgo_" in getlinepragma.
Replaces the if chains for verb distinction by a switch statement.
Replaces fmt.Sprintf by fmt.Sprintln for string concatenation.
Removes the more, getimpsym and getquoted functions by introducing a
pragmaFields function that partitions a pragma into its components.
Adds tests for cgo pragmas.
Change-Id: I43c7b9550feb3ddccaff7fb02198a3f994444123
Reviewed-on: https://go-review.googlesource.com/21607
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Needed by the build system to shard tests. nacl was the last unsharded
builder.
(I considered also adding a -make-only flag to nacltest.bash, but that
wouldn't fail fast when the file didn't exist.)
Updates #15242
Change-Id: I6afc1c1fe4268ab98c0724b5764c67d3784caebe
Reviewed-on: https://go-review.googlesource.com/21851
Reviewed-by: Andrew Gerrand <adg@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Per RFC 5246, 7.4.1.3:
cipher_suite
The single cipher suite selected by the server from the list in
ClientHello.cipher_suites. For resumed sessions, this field is
the value from the state of the session being resumed.
The specifications are not very clearly written about resuming sessions
at the wrong version (i.e. is the TLS 1.0 notion of "session" the same
type as the TLS 1.1 notion of "session"?). But every other
implementation enforces this check and not doing so has some odd
semantics.
Change-Id: I6234708bd02b636c25139d83b0d35381167e5cad
Reviewed-on: https://go-review.googlesource.com/21153
Reviewed-by: Adam Langley <agl@golang.org>
This change makes String and MarshalText methods of IP return a
hexadecial form of IP with no punctuation as part of error
notification. It doesn't affect the existing behavior of ParseIP.
Also fixes bad shadowing in ipToSockaddr and makes use of reserved
IP address blocks for documnetation.
Fixes#15052.
Updates #15228.
Change-Id: I9e9ecce308952ed5683066c3d1bb6a7b36458c65
Reviewed-on: https://go-review.googlesource.com/21642
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Apparently we forgot to test this.
Fixes#15092
Change-Id: I33d4fef0f659dfbdfc1ebf8401e96610c8215592
Reviewed-on: https://go-review.googlesource.com/21860
Reviewed-by: Robert Griesemer <gri@golang.org>
Passes on OpenBSD now when running it with -count=500.
Presumably this will also fix the same problems seen on FreeBSD and
Windows.
Fixes#15158
Change-Id: I86451c901613dfa5ecff0c2ecc516527a3c011b3
Reviewed-on: https://go-review.googlesource.com/21840
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Andrew Gerrand <adg@golang.org>
The way that -all works was unclear from the documentation and made
worse by recent changes to the flag package. Improve matters by making
the help message say "default true" for the tests that do default to true,
and tweak some of the wording.
Before:
Usage of vet:
vet [flags] directory...
vet [flags] files... # Must be a single package
For more information run
go doc cmd/vet
Flags:
-all
enable all non-experimental checks (default unset)
-asmdecl
check assembly against Go declarations (default unset)
...
After:
Usage of vet:
vet [flags] directory...
vet [flags] files... # Must be a single package
By default, -all is set and all non-experimental checks are run.
For more information run
go doc cmd/vet
Flags:
-all
enable all non-experimental checks (default true)
-asmdecl
check assembly against Go declarations (default true)
...
Change-Id: Ie94b27381a9ad2382a10a7542a93bce1d59fa8f5
Reviewed-on: https://go-review.googlesource.com/21495
Reviewed-by: Andrew Gerrand <adg@golang.org>
This is controlled by the "regalloc" stats flag, since regalloc
calls stackalloc. The plan is for this to allow comparison
of cheaper stack allocation algorithms with what we have now.
Change-Id: Ibf64a780344c69babfcbb328fd6d053ea2e02cfc
Reviewed-on: https://go-review.googlesource.com/21393
Run-TryBot: David Chase <drchase@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
The decomposer of builtin types is confused by having structs
still around from the user-type decomposer. They're all dead though,
so just enabling a deadcode pass fixes things.
Change-Id: I2df6bc7e829be03eabfd24c8dda1bff96f3d7091
Reviewed-on: https://go-review.googlesource.com/21839
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Emulate 64-bit signed high multiplication ((a*b)>>64). To do this
we use the 64-bit unsigned high multiplication method and then
fix the result as shown in Hacker's Delight 2nd ed., chapter 8-3.
Required to enable some division optimizations.
Change-Id: I9194f428e09d3d029cb1afb4715cd5424b5d922e
Reviewed-on: https://go-review.googlesource.com/21774
Reviewed-by: Bill O'Farrell <billotosyr@gmail.com>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Workaround external linking issues encountered on Solaris 11.2+ due to
the go.o object file being created with a NULL STT_FILE symtab entry by
using a placeholder name.
Fixes#14957
Change-Id: I89c501b4c548469f3c878151947d35588057982b
Reviewed-on: https://go-review.googlesource.com/21636
Reviewed-by: David Crawshaw <crawshaw@golang.org>
When a struct is SSAable, we will name its component parts
by their field names. For example,
type T struct {
a, b, c int
}
If we ever need to spill a variable x of type T, we will
spill its individual components to variables named x.a, x.b,
and x.c.
Change-Id: I857286ff1f2597f2c4bbd7b4c0b936386fb37131
Reviewed-on: https://go-review.googlesource.com/21389
Reviewed-by: David Chase <drchase@google.com>
Removes 49 more bound checks in make.bash. For example:
var a[100]int
for i := 0; i < 50; i++ {
use a[i+25]
}
Change-Id: I85e0130ee5d07f0ece9b17044bba1a2047414ce7
Reviewed-on: https://go-review.googlesource.com/21379
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: Alexandru Moșoi <alexandru@mosoi.ro>
TryBot-Result: Gobot Gobot <gobot@golang.org>
The previous cleanup was done with a buggy tool, missing some potential
rewrites.
Change-Id: I333467036e355f999a6a493e8de87e084f374e26
Reviewed-on: https://go-review.googlesource.com/21378
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
After making dwarf generation backed by LSyms there was a performance regression
of about 10%. These changes make on the fly symbol generation faster and
are meant to help mitigate that.
name old secs new secs delta
LinkCmdGo 0.55 ± 9% 0.53 ± 8% -4.42% (p=0.000 n=100+99)
name old MaxRSS new MaxRSS delta
LinkCmdGo 152k ± 6% 149k ± 3% -1.99% (p=0.000 n=99+97)
Change-Id: Iacca3ec924ce401aa83126bc0b10fe89bedf0ba6
Reviewed-on: https://go-review.googlesource.com/21733
Run-TryBot: Shahar Kohanim <skohanim@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
For heavily loaded servers, even 1 second of trace is too large
to process with the trace viewer; using a float64 here allows
fetching /debug/pprof/trace?seconds=0.1.
Change-Id: I286c07abf04f9c1fe594b0e26799bf37f5c734db
Reviewed-on: https://go-review.googlesource.com/21455
Reviewed-by: Austin Clements <austin@google.com>
Merge the amd64 lfstack implementation into the general 64 bit
implementation.
Change-Id: Id9ed61b90d2e3bc3b0246294c03eb2c92803b6ca
Reviewed-on: https://go-review.googlesource.com/21707
Run-TryBot: Dave Cheney <dave@cheney.net>
Reviewed-by: Minux Ma <minux@golang.org>
This commit adds two new functions to cgen.go: hasHMUL64 and
hasRROTC64. These are used to determine whether or not an
architecture supports the instructions needed to perform an
optimization in cgen_div.
This commit should not affect existing architectures (although it
does add s390x to the new functions). However, since most
architectures support HMUL the hasHMUL64 function could be
modified to enable most of the optimizations in cgen_div on those
platforms.
Change-Id: I33bf329ddeb6cf2954bd17b7c161012de352fb62
Reviewed-on: https://go-review.googlesource.com/21775
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
After mdempsky's recent changes, these are the only references to
"TheChar" left in the Go tree. Without the context, and without
knowing the history, this is confusing.
Also rename sys.TheGoos and sys.TheGoarch to sys.GOOS
and sys.GOARCH.
Also change the heap dump format to include sys.GOARCH
rather than TheChar, which is no longer a concept.
Updates #15169 (changes heapdump format)
Change-Id: I3e99eeeae00ed55d7d01e6ed503d958c6e931dca
Reviewed-on: https://go-review.googlesource.com/21647
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This excludes internal and testdata packages, as well as func types.
No new whitelist entries were found.
Change-Id: Ie7d42ce0a235394e4bcabf09e155726a35cd2d3d
Reviewed-on: https://go-review.googlesource.com/21822
Reviewed-by: Rob Pike <r@golang.org>
Only compute the number of maximum allowed elements per slice once.
name old time/op new time/op delta
MakeSlice-2 55.5ns ± 1% 45.6ns ± 2% -17.88% (p=0.000 n=99+100)
Change-Id: I951feffda5d11910a75e55d7e978d306d14da2c5
Reviewed-on: https://go-review.googlesource.com/21801
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
When evaluating "{{.MissingField}}" on a nil *T, Exec returns
"can't evaluate field MissingField in type *T" instead of
"nil pointer evaluating *T.MissingField".
Fixesgolang/go#15125
Change-Id: I6e73f61b8a72c694179c1f8cdc808766c90b6f57
Reviewed-on: https://go-review.googlesource.com/21705
Reviewed-by: Rob Pike <r@golang.org>
Instead of being a hint, resultInArg0 is now enforced by regalloc.
This allows us to delete all the code from amd64/ssa.go which
deals with converting from a semantically three-address instruction
into some copies plus a two-address instruction.
Change-Id: Id4f39a80be4b678718bfd42a229f9094ab6ecd7c
Reviewed-on: https://go-review.googlesource.com/21816
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
This improves the short version of the writer test.
First of all, it has a much quicker setup. Previously that
could take up towards 0.5 second.
Secondly, it will test all compression levels in short mode as well.
Execution time is 1.7s/0.03s for normal/short mode.
Change-Id: I275a21f712daff6f7125cc6a493415e86439cb19
Reviewed-on: https://go-review.googlesource.com/21800
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Replace calls to bio.Bread with calls to io.ReadFull.
Change-Id: I2ee8739d01e04a4da9c20b6ce7d1d5b89914b8ad
Reviewed-on: https://go-review.googlesource.com/21750
Reviewed-by: Dave Cheney <dave@cheney.net>
