The Go programming language
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Keith Randall 3baf53aec6 cmd/compile: derive bounds on signed %N for N a power of 2
-N+1 <= x % N <= N-1

This is useful for cases like:

func setBit(b []byte, i int) {
    b[i/8] |= 1<<(i%8)
}

The shift does not need protection against larger-than-7 cases.
(It does still need protection against <0 cases.)

Change-Id: Idf83101386af538548bfeb6e2928cea855610ce2
Reviewed-on: https://go-review.googlesource.com/c/go/+/672995
Reviewed-by: Jorropo <jorropo.pgm@gmail.com>
Reviewed-by: David Chase <drchase@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
2025-05-19 15:21:54 -07:00
.github .github: update language change proposal template 2024-08-08 19:02:29 +00:00
api go/token: add FileSet.AddExistingFiles 2025-05-19 11:26:48 -07:00
doc go/token: add FileSet.AddExistingFiles 2025-05-19 11:26:48 -07:00
lib lib/time: build with Ubuntu backward compatibility options 2025-02-06 17:10:15 -08:00
misc misc/linkcheck: remove unused tool 2025-03-20 04:38:55 -07:00
src cmd/compile: derive bounds on signed %N for N a power of 2 2025-05-19 15:21:54 -07:00
test cmd/compile: derive bounds on signed %N for N a power of 2 2025-05-19 15:21:54 -07:00
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.gitignore runtime,internal: move runtime/internal/sys to internal/runtime/sys 2024-07-23 19:05:35 +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 4.0 Attribution 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://go.dev/dl/.

After downloading a binary release, visit https://go.dev/doc/install for installation instructions.

Install From Source

If a binary distribution is not available for your combination of operating system and architecture, visit https://go.dev/doc/install/source for source installation instructions.

Contributing

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

To contribute, please read the contribution guidelines at https://go.dev/doc/contribute.

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