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The Go programming language
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3d8cb26504
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Keith Randall 3d8cb26504 cmd/compile: modify switches of strings to use jump table for lengths 
Reorganize the way we rewrite expression switches on strings, so that
jump tables are naturally used for the outer switch on the string length.

The changes to the prove pass in this CL are required so as to not repeat
the test for string length in each case.

name                         old time/op  new time/op  delta
SwitchStringPredictable    2.28ns ± 9%  2.08ns ± 5%   -9.04%  (p=0.000 n=10+10)
SwitchStringUnpredictable  10.5ns ± 1%   9.5ns ± 1%   -9.08%  (p=0.000 n=9+10)

Update #5496
Update #34381

Change-Id: Ie6846b1dd27f3e472f7c30dfcc598c68d440b997
Reviewed-on: https://go-review.googlesource.com/c/go/+/395714
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Keith Randall <khr@google.com>
2022-04-14 21:16:11 +00:00
.github .github: remove duplicate security link 2022-01-07 17:55:09 +00:00
api crypto/x509: add CertPool.Clone 2022-04-13 19:04:59 +00:00
doc doc/go1.19: document cmd/go changes involving -trimpath 2022-04-12 22:05:26 +00:00
lib/time lib/time, time/tzdata: update to 2021e 2021-11-11 05:16:39 +00:00
misc all: gofmt main repo 2022-04-11 16:34:30 +00:00
src cmd/compile: modify switches of strings to use jump table for lengths 2022-04-14 21:16:11 +00:00
test cmd/compile: constant-fold switches early in compilation 2022-04-14 19:37:30 +00:00
.gitattributes
.gitignore internal/buildcfg: move build configuration out of cmd/internal/objabi 2021-04-16 19:20:53 +00:00
AUTHORS A+C: add Wen Yang (individual CLA) 2022-04-11 22:24:03 +00:00
codereview.cfg
CONTRIBUTING.md
CONTRIBUTORS A+C: add Wen Yang (individual CLA) 2022-04-11 22:24:03 +00:00
LICENSE
PATENTS
README.md README.md: update links to go.dev 2022-03-20 16:05:03 +00:00
SECURITY.md

README.md

The Go Programming Language

Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.

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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 at https://go.dev/doc/contribute.

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.