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Keith Randall c6118af558 cmd/compile: don't do floating point optimization x+0 -> x 
That optimization is not valid if x == -0.

The test is a bit tricky because 0 == -0. We distinguish
0 from -0 with 1/0 == inf, 1/-0 == -inf.

This has been a bug since CL 24790 in Go 1.8. Probably doesn't
warrant a backport.

Fixes #27718

Note: the optimization x-0 -> x is actually valid.
But it's probably best to take it out, so as to not confuse readers.

Change-Id: I99f16a93b45f7406ec8053c2dc759a13eba035fa
Reviewed-on: https://go-review.googlesource.com/135701
Reviewed-by: Cherry Zhang <cherryyz@google.com>
2018-09-18 20:27:09 +00:00
.github .github: use HTTPS for Stack Overflow link in SUPPORT.md 2018-06-12 11:08:14 +00:00
api os: add ModeCharDevice to ModeType 2018-09-13 09:52:57 +00:00
doc doc: add a go/golang entry to the FAQ 2018-09-16 09:18:36 +00:00
lib/time lib/time: update vendored tzdata to release 2018e 2018-06-11 14:47:06 +00:00
misc misc/cgo/testplugin: disable DWARF tests on darwin 2018-09-05 11:27:37 +00:00
src cmd/compile: don't do floating point optimization x+0 -> x 2018-09-18 20:27:09 +00:00
test cmd/compile: don't do floating point optimization x+0 -> x 2018-09-18 20:27:09 +00:00
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AUTHORS A+C: add VMware as author, Venil Noronha as contributor 2018-08-31 02:14:24 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +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.