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Robert Findley de0f4d190f go/types, types2: don't build unnecessary error strings in implements 
When accessing (*Checker).implements from types.AssignableTo or
types.ComparableTo, we don't need to build error strings -- they won't
be used.

This string manipulation showed up as a hot spot in gopls completion,
which checks a lot of type predicates when searching for candidate
completions.

This CL yields the following results for gopls' completion benchmarks:

StructCompletion-8         24.7ms ±34%  26.0ms ±17%     ~     (p=0.447 n=10+9)
ImportCompletion-8         1.41ms ± 2%  1.45ms ± 4%   +2.42%  (p=0.027 n=8+9)
SliceCompletion-8          27.0ms ±18%  25.2ms ± 3%   -6.67%  (p=0.008 n=9+8)
FuncDeepCompletion-8       57.6ms ± 4%  22.4ms ± 4%  -61.18%  (p=0.000 n=8+9)
CompletionFollowingEdit-8   157ms ±13%   103ms ±15%  -34.70%  (p=0.000 n=10+10)

Notably, deep completion (which searches many candidates) is almost 3x
faster after this change.

Fixes #54172

Change-Id: If8303a411aed3a20bd91f7b61e346d703084166c
Reviewed-on: https://go-review.googlesource.com/c/go/+/423360
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@google.com>
2022-08-15 20:41:00 +00:00
.github .github: remove duplicate security link 2022-01-07 17:55:09 +00:00
api bytes: add Clone function 2022-08-15 19:17:20 +00:00
doc doc: move Go 1.19 release notes to x/website 2022-08-01 18:07:12 +00:00
lib/time lib/time, time/tzdata: update to 2022b 2022-08-11 20:03:19 +00:00
misc misc/cgo/testsanitizers: fix code to detect gcc version correctly 2022-08-11 17:23:33 +00:00
src go/types, types2: don't build unnecessary error strings in implements 2022-08-15 20:41:00 +00:00
test test: fix issue53702.go for noopt builder 2022-08-15 17:50:32 +00:00
.gitattributes all: treat all files as binary, but check in .bat with CRLF 2020-06-08 15:31:43 +00:00
.gitignore internal/buildcfg: move build configuration out of cmd/internal/objabi 2021-04-16 19:20:53 +00:00
codereview.cfg codereview.cfg: add codereview.cfg for master branch 2021-02-19 18:44:53 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
LICENSE
PATENTS
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

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.

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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://go.dev/wiki/Questions for a list of places to ask questions about the Go language.