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Joe Tsai f7396aaea0 time: optimize Parse for RFC3339 and RFC3339Nano 
RFC 3339 is the most common time representation,
being used in an overwhelming 57.3% of all specified formats,
while the next competitor only holds 7.5% usage.
Specially optimize parsing to handle the RFC 3339 format.
To reduce the complexity of error checking,
parseRFC3339 simply returns a bool indicating parsing success.
It leaves error handling to the general parse path.

To assist in fuzzing, the internal parse function was left unmodified
so that we could test that parseRFC3339 and parse agree with each other.

Performance:

	name             old time/op  new time/op  delta
	ParseRFC3339UTC  112ns ± 1%   37ns ± 1%    -67.37%  (p=0.000 n=9+9)
	ParseRFC3339TZ   259ns ± 2%   67ns ± 1%    -73.92%  (p=0.000 n=10+9)

Credit goes to Amarjeet Anand for a prior CL attemping to optimize this.
See CL 425014.

Fixes #54093

Change-Id: I14f4e8c52b092d44ceef6863f261842ed7e83f4c
Reviewed-on: https://go-review.googlesource.com/c/go/+/425197
Reviewed-by: Rob Pike <r@golang.org>
Run-TryBot: Joseph Tsai <joetsai@digital-static.net>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Joseph Tsai <joetsai@digital-static.net>
Reviewed-by: Jenny Rakoczy <jenny@golang.org>
2022-09-13 17:35:58 +00:00
.github .github: update issue label for pkgsite-removal 2022-09-07 16:00:20 +00:00
api syscall: add CgroupFD support for ForkExec on Linux 2022-09-09 15:34:16 +00:00
doc spec: describe slice-to-array conversions 2022-09-08 16:37:47 +00:00
lib/time lib/time, time/tzdata: update to 2022b 2022-08-11 20:03:19 +00:00
misc misc: use strings.Builder 2022-09-06 15:44:25 +00:00
src time: optimize Parse for RFC3339 and RFC3339Nano 2022-09-13 17:35:58 +00:00
test sync: convert RWMutex.{readerCount,readerWait} to atomic type 2022-09-09 18:28:35 +00:00
.gitattributes all: treat all files as binary, but check in .bat with CRLF 2020-06-08 15:31:43 +00:00
.gitignore internal/buildcfg: move build configuration out of cmd/internal/objabi 2021-04-16 19:20:53 +00:00
codereview.cfg codereview.cfg: add codereview.cfg for master branch 2021-02-19 18:44:53 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
LICENSE doc: revert copyright date to 2009 2016-06-01 22:40:04 +00:00
PATENTS
README.md README.md: update wiki link 2022-04-26 16:21:18 +00:00
SECURITY.md SECURITY.md: replace golang.org with go.dev 2022-04-26 19:59:47 +00:00

README.md

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