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Keith Randall 14f3ca56ed cmd/internal/obj: ARM, use immediates instead of constant pool entries 
When a constant doesn't fit in a single instruction, use two
paired instructions instead of the constant pool.  For example

  ADD $0xaa00bb, R0, R1

Used to rewrite to:

  MOV ?(IP), R11
  ADD R11, R0, R1

Instead, do:

  ADD $0xaa0000, R0, R1
  ADD $0xbb, R1, R1

Same number of instructions.
Good:
  4 less bytes (no constant pool entry)
  One less load.
Bad:
  Critical path is one instruction longer.

It's probably worth it to avoid the loads, they are expensive.

Dave Cheney got us some performance numbers: https://perf.golang.org/search?q=upload:20170426.1
TL;DR mean 1.37% improvement.

Change-Id: Ib206836161fdc94a3962db6f9caa635c87d57cf1
Reviewed-on: https://go-review.googlesource.com/41612
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
2017-04-27 16:45:01 +00:00
.github doc: improve issue template and contribution guidelines 2017-02-11 20:42:06 +00:00
api math/big: define Word as uint instead of uintptr 2017-02-21 19:31:40 +00:00
doc doc: add Go Time podcast to the help page 2017-04-21 00:42:07 +00:00
lib/time *.bash: always use the same string equality operator 2017-03-14 21:46:31 +00:00
misc misc/ios: increase iOS test harness timeout 2017-04-27 14:42:37 +00:00
src cmd/internal/obj: ARM, use immediates instead of constant pool entries 2017-04-27 16:45:01 +00:00
test cmd/internal/obj: ARM, use immediates instead of constant pool entries 2017-04-27 16:45:01 +00:00
.gitattributes .gitattributes: prevent all magic line ending changes 2014-12-12 23:14:54 +00:00
.gitignore .gitignore: change path to zbootstrap.go 2017-04-19 02:13:58 +00:00
AUTHORS A+C: automated update 2016-12-21 03:22:22 +00:00
CONTRIBUTING.md doc: improve issue template and contribution guidelines 2017-02-11 20:42:06 +00:00
CONTRIBUTORS A+C: automated update 2016-12-21 03:22:22 +00:00
favicon.ico website: recreate 16px and 32px favicon 2016-08-25 15:43:32 +00:00
LICENSE doc: revert copyright date to 2009 2016-06-01 22:40:04 +00:00
PATENTS LICENSE: separate, change PATENTS text 2010-12-06 16:31:59 -05:00
README.md readme: add attribution for the Gopher image 2017-02-03 19:39:41 +00:00
robots.txt godoc: serve robots.txt raw 2011-02-19 05:46:20 +11:00

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.

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Unless otherwise noted, the Go source files are distributed under the BSD-style license found in the LICENSE file.

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To contribute, please read the contribution guidelines: https://golang.org/doc/contribute.html

Note that the Go project does not use GitHub pull requests, and that we use 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.