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Alexander Musman dcb479c2f9 cmd/compile: optimize slice bounds checking with SUB/SUBconst comparisons 
Optimize ARM64 code generation for slice bounds checking by recognizing
patterns where comparisons to zero involve SUB or SUBconst operations.
This change adds SSA opt rules to simplify:
 (CMPconst [0] (SUB x y)) => (CMP x y)

The optimizations apply to EQ, NE, ULE, and UGT comparisons, enabling
more efficient bounds checking for slice operations.

Code size improvement:
compile: .text:    9088004  ->  9065988 (-0.24%)
etcd:    .text:    10500276 -> 10497092 (-0.03%)
Change-Id: I467cb27674351652bcacc52b87e1f19677bd46a8
Reviewed-on: https://go-review.googlesource.com/c/go/+/679915
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Auto-Submit: Keith Randall <khr@golang.org>
2025-07-24 12:39:53 -07:00
.github .github: update language change proposal template 2024-08-08 19:02:29 +00:00
api testing: add Output method to TB 2025-06-02 09:09:57 -07:00
doc cmd/doc: delete 2025-07-24 09:59:36 -07:00
lib cmd/dist: test encoding/json/... with GOEXPERIMENT=jsonv2 2025-06-23 18:21:07 -07:00
misc misc/linkcheck: remove unused tool 2025-03-20 04:38:55 -07:00
src cmd/compile: optimize slice bounds checking with SUB/SUBconst comparisons 2025-07-24 12:39:53 -07:00
test cmd/compile: optimize slice bounds checking with SUB/SUBconst comparisons 2025-07-24 12:39:53 -07:00
.gitattributes all: treat all files as binary, but check in .bat with CRLF 2020-06-08 15:31:43 +00:00
.gitignore runtime,internal: move runtime/internal/sys to internal/runtime/sys 2024-07-23 19:05:35 +00:00
codereview.cfg codereview.cfg: add codereview.cfg for master branch 2021-02-19 18:44:53 +00:00
CONTRIBUTING.md doc: normalize proposal-process links 2023-03-29 22:00:27 +00:00
go.env cmd/go: additional doc-inspired tests and bug fixes 2023-06-06 19:18:46 +00:00
LICENSE LICENSE: update per Google Legal 2024-08-09 14:54:31 +00:00
PATENTS LICENSE: separate, change PATENTS text 2010-12-06 16:31:59 -05:00
README.md README: fix CC BY license name 2024-07-22 17:45:27 +00:00
SECURITY.md SECURITY.md: update the Reporting a Vulnerability link 2023-09-22 21:17:24 +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 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.

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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.