delta/go-git.git/src/crypto/sha256, branch dev.debug

internal/cpu: new package to detect cpu features

2017-05-10T17:02:21+00:00

Implements detection of x86 cpu features that
are used in the go standard library.

Changes all standard library packages to use the new cpu package
instead of using runtime internal variables to check x86 cpu features.

Updates: #15403

Change-Id: I2999a10cb4d9ec4863ffbed72f4e021a1dbc4bb9
Reviewed-on: https://go-review.googlesource.com/41476
Reviewed-by: Brad Fitzpatrick 
Reviewed-by: Keith Randall 
Run-TryBot: Brad Fitzpatrick 
TryBot-Result: Gobot Gobot

crypto/sha256,crypto/sha512: improve performance for sha{256,512}.block on ppc64le

2017-04-26T12:34:03+00:00

This updates sha256.block and sha512.block to use vector instructions.  While
each round must still be performed independently, this allows for the use of
the vshasigma{w,d} crypto acceleration instructions.

For crypto/sha256:

benchmark               old ns/op     new ns/op     delta
BenchmarkHash8Bytes     570           300           -47.37%
BenchmarkHash1K         7529          3018          -59.91%
BenchmarkHash8K         55308         21938         -60.33%

benchmark               old MB/s     new MB/s     speedup
BenchmarkHash8Bytes     14.01        26.58        1.90x
BenchmarkHash1K         136.00       339.23       2.49x
BenchmarkHash8K         148.11       373.40       2.52x

For crypto/sha512:

benchmark               old ns/op     new ns/op     delta
BenchmarkHash8Bytes     725           394           -45.66%
BenchmarkHash1K         5062          2107          -58.38%
BenchmarkHash8K         34711         13918         -59.90%

benchmark               old MB/s     new MB/s     speedup
BenchmarkHash8Bytes     11.03        20.29        1.84x
BenchmarkHash1K         202.28       485.84       2.40x
BenchmarkHash8K         236.00       588.56       2.49x

Fixes #20069

Change-Id: I28bffe6e9eb484a83a004116fce84acb4942abca
Reviewed-on: https://go-review.googlesource.com/41391
Run-TryBot: Lynn Boger 
TryBot-Result: Gobot Gobot 
Reviewed-by: Carlos Eduardo Seo 
Reviewed-by: David Chase 
Reviewed-by: Lynn Boger

crypto: detect BMI usability on AMD64 for sha1 and sha256

2017-01-05T15:37:37+00:00

The existing implementations on AMD64 only detects AVX2 usability,
when they also contains BMI (bit-manipulation instructions).
These instructions crash the running program as 'unknown instructions'
on the architecture, e.g. i3-4000M, which supports AVX2 but not
support BMI.

This change added the detections for BMI1 and BMI2 to AMD64 runtime with
two flags as the result, `support_bmi1` and `support_bmi2`,
in runtime/runtime2.go. It also completed the condition to run AVX2 version
in packages crypto/sha1 and crypto/sha256.

Fixes #18512

Change-Id: I917bf0de365237740999de3e049d2e8f2a4385ad
Reviewed-on: https://go-review.googlesource.com/34850
Reviewed-by: Ian Lance Taylor 
Run-TryBot: Ian Lance Taylor 
TryBot-Result: Gobot Gobot

all: make copyright headers consistent with one space after period

2016-11-04T20:46:25+00:00

Continuation of CL 20111.

Change-Id: Ie2f62237e6ec316989c021de9b267cc9d6ee6676
Reviewed-on: https://go-review.googlesource.com/32830
Reviewed-by: Brad Fitzpatrick

crypto/sha256: improve performance for sha256.block on ppc64le

2016-10-31T19:14:01+00:00

Adds an assembly implementation of sha256.block for ppc64le to improve its
performance.  This implementation is largely based on the original amd64
implementation, which unrolls the 64 iterations of the inner loop.

Fixes #17652

benchmark               old ns/op     new ns/op     delta
BenchmarkHash8Bytes     1263          767           -39.27%
BenchmarkHash1K         14048         7766          -44.72%
BenchmarkHash8K         102245        55626         -45.60%

benchmark               old MB/s     new MB/s     speedup
BenchmarkHash8Bytes     6.33         10.43        1.65x
BenchmarkHash1K         72.89        131.85       1.81x
BenchmarkHash8K         80.12        147.27       1.84x

Change-Id: Ib4adf429423b20495580400be10bd7e171bcc70b
Reviewed-on: https://go-review.googlesource.com/32318
Reviewed-by: Carlos Eduardo Seo 
Reviewed-by: David Chase 
Run-TryBot: David Chase 
TryBot-Result: Gobot Gobot

crypto/md5, crypto/sha1, crypto/sha256: add examples for checksumming a file

2016-09-19T17:29:19+00:00

Updates #16360.

Change-Id: I75714d2b5f095fe39fd81edfa6dd9e44d7c44da1
Reviewed-on: https://go-review.googlesource.com/29375
Run-TryBot: Brad Fitzpatrick 
TryBot-Result: Gobot Gobot 
Reviewed-by: Brad Fitzpatrick

crypto/sha256: add examples for New, Sum256

2016-08-31T05:13:48+00:00

The goal for these examples is to show how to mirror the
functionality of the sha256sum Unix utility, a common checksumming
tool, using the Go standard library.

Add a newline at the end of the input, so users will get the same
output if they type `echo 'hello world' | sha256sum`, since the
builtin shell echo appends a newline by default. Also use hex output
(instead of the shorter base64) since this is the default output
encoding for shasum/sha256sum.

Change-Id: I0036874b3cc5ba85432bfcb86f81b51c4e0238fd
Reviewed-on: https://go-review.googlesource.com/24868
Reviewed-by: Emmanuel Odeke 
Reviewed-by: Brad Fitzpatrick 
Run-TryBot: Brad Fitzpatrick 
TryBot-Result: Gobot Gobot

all: fix assembly vet issues

2016-08-25T18:52:31+00:00

Add missing function prototypes.
Fix function prototypes.
Use FP references instead of SP references.
Fix variable names.
Update comments.
Clean up whitespace. (Not for vet.)

All fairly minor fixes to make vet happy.

Updates #11041

Change-Id: Ifab2cdf235ff61cdc226ab1d84b8467b5ac9446c
Reviewed-on: https://go-review.googlesource.com/27713
Run-TryBot: Josh Bleecher Snyder 
TryBot-Result: Gobot Gobot 
Reviewed-by: Brad Fitzpatrick

cmd/internal/obj/x86: VPSHUFD takes an unsigned byte.

2016-08-16T00:21:50+00:00

VPSHUFD should take an unsigned argument to be consistent with
PSHUFD. Also fix all usage.

Fixes #16499

Change-Id: Ie699c102afed0379445914a251710365b14d89b6
Reviewed-on: https://go-review.googlesource.com/25383
Run-TryBot: Ilya Tocar 
Reviewed-by: Keith Randall 
TryBot-Result: Gobot Gobot

crypto/sha256: Use AVX2 if possible

2016-05-06T15:20:37+00:00

name          old time/op    new time/op    delta
Hash8Bytes-4     376ns ± 0%     246ns ± 0%  -34.57%  (p=0.000 n=20+20)
Hash1K-4        5.21µs ± 0%    2.82µs ± 0%  -45.83%  (p=0.000 n=20+20)
Hash8K-4        38.6µs ± 0%    20.8µs ± 0%  -46.05%  (p=0.000 n=20+20)

name          old speed      new speed      delta
Hash8Bytes-4  21.2MB/s ± 0%  32.4MB/s ± 0%  +52.70%  (p=0.000 n=15+19)
Hash1K-4       197MB/s ± 0%   363MB/s ± 0%  +84.60%  (p=0.000 n=20+20)
Hash8K-4       212MB/s ± 0%   393MB/s ± 0%  +85.36%  (p=0.000 n=20+20)

Change-Id: Ib50119c591074ff486d11d3566e24b691bcc6598
Reviewed-on: https://go-review.googlesource.com/22608
Run-TryBot: Russ Cox 
TryBot-Result: Gobot Gobot 
Reviewed-by: Russ Cox