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Marvin Stenger bad5abf64d cmd/compile: avoid copying in nilcheckelim2 
nilcheckelim2 cleans up by copying b.Values in a loop, omitting
OpUnknowns. However, the common case is that there are no OpUnknowns,
in which case we can skip a lot of work.

So we track the first nilcheck which was eliminated, if any, and only
start copying from there. If no nilcheck was eliminated we won't copy at all.

Fixes #20964

Change-Id: Icd44194cf8ac81ce6485ce257b4d33e093003a40
Reviewed-on: https://go-review.googlesource.com/65651
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
2017-09-29 09:27:14 +00:00
.github .github: update ISSUE_TEMPLATE to be closer to 'go bug' 2017-08-19 04:06:10 +00:00
api doc, api: add syscall.SysProcAttr.AmbientCaps change to 1.9 notes, API 2017-06-29 03:29:46 +00:00
doc doc: fix minor capitalization typo 2017-09-28 17:13:13 +00:00
lib/time time: vendor tzdata-2017b and update test 2017-06-07 21:23:58 +00:00
misc cmd/go: use -importcfg to invoke compiler, linker 2017-09-29 00:22:58 +00:00
src cmd/compile: avoid copying in nilcheckelim2 2017-09-29 09:27:14 +00:00
test cmd/compile: fix another invalid switch case panic 2017-09-27 21:19:06 +00:00
.gitattributes .gitattributes: prevent all magic line ending changes 2014-12-12 23:14:54 +00:00
.gitignore .gitignore: include only Go project artifiacts 2017-08-15 21:37:05 +00:00
AUTHORS A+C: final updates for Go 1.9 2017-07-18 01:47:54 +00:00
CONTRIBUTING.md .github: recommend 'go bug' when filing an issue 2017-07-24 17:18:34 +00:00
CONTRIBUTORS A+C: final updates for Go 1.9 2017-07-18 01:47:54 +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
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README.md readme: add attribution for the Gopher image 2017-02-03 19:39:41 +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 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.