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The Go programming language
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erifan01 e09bbaec69 cmd/compile: enable address folding for global symbols of shared library 
Address folding is disabled in CL42172, the commit message of which
said that "In shared library, load/store of global is rewritten to
using GOT and temp register, which conflicts with the use of temp
register for assembling large offset.". Actually this doesn't happen
because the sequence of instructions when rewritten to use Got looks
like this:
  MOVD $sym, Rx becomes
  MOVD sym@GOT, Rx
If there is an offset off, there will be one more instruction:
  ADD $off, Rx, Rx

And MOVD sym, Rx becomes
  MOVD sym@GOT, REGTMP
  MOVx (REGTMP), Ry

If there is a small offset off, it becomes:
  MOVD sym@GOT, REGTMP
  MOVx (REGTMP)off, Ry

If off is very large, it becomes:
  MOVD sym@GOT, REGTMP
  MOVD $off, Rt
  ADD  Rt, REGTMP
  MOVx (REGTMP), Ry

We can see that the address can be calculated correctly, and testing
on darwin/arm64 confirms this.

Removing this restriction is beneficial to further optimize the sequence
of "ADRP+ADD+LD/ST" to "ADRP+LD/ST(offset), so this CL removes it.

Change-Id: I0e9f7bc1723e0a027f32cf0ae2c41cd6df49defe
Reviewed-on: https://go-review.googlesource.com/c/go/+/445535
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Eric Fang <eric.fang@arm.com>
Reviewed-by: Heschi Kreinick <heschi@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
 		2022-10-29 04:48:07 +00:00
.github .github: update issue label for pkgsite-removal 2022-09-07 16:00:20 +00:00
api os/exec: add the Cancel and WaitDelay fields 2022-10-25 03:34:36 +00:00
doc doc/go1.20: go version supports non-executable Go binaries 2022-10-24 15:56:26 +00:00
lib/time lib/time, time/tzdata: update to 2022b 2022-08-11 20:03:19 +00:00
misc cmd/go: don't install most GOROOT .a files in pkg 2022-10-28 23:35:08 +00:00
src cmd/compile: enable address folding for global symbols of shared library 2022-10-29 04:48:07 +00:00
test cmd/compile: recognize when the result of append has a constant length 2022-10-27 17:09:50 +00:00
.gitattributes
…
.gitignore internal/buildcfg: move build configuration out of cmd/internal/objabi 2021-04-16 19:20:53 +00:00
CONTRIBUTING.md
…
LICENSE
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PATENTS
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README.md README.md: update wiki link 2022-04-26 16:21:18 +00:00
SECURITY.md SECURITY.md: replace golang.org with go.dev 2022-04-26 19:59:47 +00:00
codereview.cfg codereview.cfg: add codereview.cfg for master branch 2021-02-19 18:44:53 +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://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.