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Cuong Manh Le 5e804ba17d cmd/compile: use transitive relations for slice len/cap in poset 
Currently, we keep track of slice len by mapping from slice ID to
len/cap SSA value. However, slice len/cap can have multiple SSA values,
so when updating fact table for slice len/cap, we only update in one
place.

Instead, we can take advantage of the transitive relations provided by
poset. So all duplicated slice lens are set as equal to one another.
When updating fact table for one, that fact will be reflected to all
others. The same mechanism is applied for slice cap.

Removes 15 bounds checks from std/cmd.

Fixes #42603

Change-Id: I32c07968824cc33765b1e441b3ae2c4b5f5997c3
Reviewed-on: https://go-review.googlesource.com/c/go/+/273670
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
2021-02-23 05:01:04 +00:00
.github .github: add link to questions in ISSUE_TEMPLATE 2020-01-06 17:05:31 +00:00
api api/go1.16: add go/build/constraint APIs 2021-01-27 21:11:22 +00:00
doc doc/1.16: fix link to fs.FileInfo 2021-02-20 19:33:34 +00:00
lib/time lib/time, time/tzdata: update tzdata to 2021a 2021-01-25 16:08:46 +00:00
misc runtime: unify asmcgocall and systemstack traceback setup 2021-02-19 00:02:06 +00:00
src cmd/compile: use transitive relations for slice len/cap in poset 2021-02-23 05:01:04 +00:00
test cmd/compile: use transitive relations for slice len/cap in poset 2021-02-23 05:01:04 +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.

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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://golang.org/doc/contribute.html.

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.