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Daniel Martí 6a72dd77f4 cmd/go: delay parsing the testmain template 
The template is over a hundred lines and full of pipelines, and
text/template isn't optimised to parse quickly, so it's no wonder that
delaying the parsing to the first template use makes 'go env' much
faster.

Like in the previous patches to get rid of global regexp.MustCompile
vars, use the newly introduced lazytemplate package. Close to two full
milliseconds are shaved off of 'go env' runs.

name         old time/op    new time/op    delta
ExecGoEnv-8    4.27ms ± 0%    2.63ms ± 1%  -38.43%  (p=0.002 n=6+6)

Updates #29382.

Change-Id: I4e2569e51ddf2afe1b46eb1a9e9e5845f7a3b0bd
Reviewed-on: https://go-review.googlesource.com/c/155962
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
 		2019-02-28 09:34:47 +00:00
.github .github: don't render author-facing text in ISSUE_TEMPLATE 2018-11-02 04:47:34 +00:00
api text/scanner: don't liberally consume (invalid) floats or underbars 2019-02-20 20:23:28 +00:00
doc doc/go1.12: new go line in go.mod can break builds with Go 1.11 - 1.11.3 2019-02-27 22:38:32 +00:00
lib/time time: read 64-bit data if available 2019-02-26 23:10:35 +00:00
misc misc: add go.mod file 2019-02-27 17:47:31 +00:00
src cmd/go: delay parsing the testmain template 2019-02-28 09:34:47 +00:00
test cmd/compile: optimize math/bits Len32 intrinsic on arm64 2019-02-27 16:09:33 +00:00
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.gitignore .gitignore: ignore src/cmd/dist/dist 2017-10-28 21:55:49 +00:00
AUTHORS A+C: change email address for Elias Naur 2019-01-23 15:05:26 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS CONTRIBUTORS: second round of updates for Go 1.12 2019-01-30 18:01:19 +00:00
LICENSE doc: revert copyright date to 2009 2016-06-01 22:40:04 +00:00
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README.md

The Go Programming Language

Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.

Gopher image Gopher image by Renee French, licensed under Creative Commons 3.0 Attributions license.

Our canonical Git repository is located at https://go.googlesource.com/go. There is a mirror of the repository at https://github.com/golang/go.

Unless otherwise noted, the Go source files are distributed under the BSD-style license found in the LICENSE file.

Download and Install

Binary Distributions

Official binary distributions are available at https://golang.org/dl/.

After downloading a binary release, visit https://golang.org/doc/install or load doc/install.html in your web browser for installation instructions.

Install From Source

If a binary distribution is not available for your combination of operating system and architecture, visit https://golang.org/doc/install/source or load doc/install-source.html in your web browser for source installation instructions.

Contributing

Go is the work of thousands of contributors. We appreciate your help!

To contribute, please read the contribution guidelines: https://golang.org/doc/contribute.html

Note that the Go project uses the issue tracker for bug reports and proposals only. See https://golang.org/wiki/Questions for a list of places to ask questions about the Go language.