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Keith Randall 3a03ddf735 [release-branch.go1.17] cmd/compile: ensure constant shift amounts are in range for arm 
Ensure constant shift amounts are in the range [0-31]. When shift amounts
are out of range, bad things happen. Shift amounts out of range occur
when lowering 64-bit shifts (we take an in-range shift s in [0-63] and
calculate s-32 and 32-s, both of which might be out of [0-31]).

The constant shift operations themselves still work, but their shift
amounts get copied unmolested to operations like ORshiftLL which use only
the low 5 bits. That changes an operation like <<100 which unconditionally
produces 0, to <<4, which doesn't.

Fixes #48479

Change-Id: I87363ef2b4ceaf3b2e316426064626efdfbb8ee3
Reviewed-on: https://go-review.googlesource.com/c/go/+/350969
Trust: Keith Randall <khr@golang.org>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
(cherry picked from commit eff27e858b)
Reviewed-on: https://go-review.googlesource.com/c/go/+/351069
Reviewed-by: Austin Clements <austin@google.com>
2021-10-27 21:13:34 +00:00
.github .github: add link to questions in ISSUE_TEMPLATE 2020-01-06 17:05:31 +00:00
api reflect: add Value.CanConvert 2021-07-21 19:25:48 +00:00
doc [release-branch.go1.17] time: fix docs for new comma layouts 2021-08-13 16:26:40 +00:00
lib/time lib/time, time/tzdata: update tzdata to 2021a 2021-01-25 16:08:46 +00:00
misc [release-branch.go1.17] misc/wasm, cmd/link: do not let command line args overwrite global data 2021-10-07 14:54:47 +00:00
src [release-branch.go1.17] cmd/compile: ensure constant shift amounts are in range for arm 2021-10-27 21:13:34 +00:00
test [release-branch.go1.17] cmd/compile: ensure constant shift amounts are in range for arm 2021-10-27 21:13:34 +00:00
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AUTHORS A+C: update name 2021-06-01 17:08:12 +00:00
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VERSION [release-branch.go1.17] go1.17.2 2021-10-07 18:11:41 +00:00

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 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 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://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.