suzanne.soy/racket
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
The Racket repository
42,968 Commits 17 Branches 54 Tags 278 MiB
Racket 50.1%
C 35.9%
Scheme 3.4%
Shell 2.6%
Assembly 1.8%
Other 6.1%
fea6a0b9ae
Go to file
Robby Findler fea6a0b9ae specialize or/c when its arguments are eq-contracts 
This commit improves the performance of or/c contracts with symbols
(or other things that the contract system compares with eq?).

For example, on the program below we halve the distance to
just writing the contract directly as a predicate.

```
 #lang racket/base
(require racket/contract/base)

(define c1 (or/c 'x 'y (integer-in 1 24)))

(define (c2 x)
  (or (eq? x 'x) (eq? x 'y)
      (and (exact-integer? x)
           (<= 1 x 24))))

(define f1
  (contract (-> c1 any)
            (λ (x) x) 'pos 'neg))

(define f2
  (contract (-> c2 any)
            (λ (x) x) 'pos 'neg))

(define (try f)
  (time
   (for ([x (in-range 1000000)])
     (f 'x) (f 'y) (f 10) (f 'x) (f 'y) (f 10)
     (f 'x) (f 'y) (f 10) (f 'x) (f 'y) (f 10)
     (f 'x) (f 'y) (f 10) (f 'x) (f 'y) (f 10)
     (f 'x) (f 'y) (f 10) (f 'x) (f 'y) (f 10)
     (f 'x) (f 'y) (f 10) (f 'x) (f 'y) (f 10))))

(try f1)
(try f2)
```

with this commit:
cpu time: 849 real time: 850 gc time: 39
cpu time: 615 real time: 616 gc time: 2

without this commit:
cpu time: 1020 real time: 1021 gc time: 37
cpu time: 616 real time: 617 gc time: 2
2021-04-16 14:31:43 -05:00
.github Run workflow directly in VM (#3731) 2021-03-19 18:23:29 +01:00
pkgs specialize or/c when its arguments are eq-contracts 2021-04-16 14:31:43 -05:00
racket specialize or/c when its arguments are eq-contracts 2021-04-16 14:31:43 -05:00
.gitattributes Don't include git files in archives. 2010-05-12 01:46:05 -04:00
.gitignore Fix typo. 2019-06-21 12:32:37 -05:00
.lgtm.yml Fetch PB to start LGTM build 2020-08-07 12:17:17 +02:00
.mailmap Minor metadata changes. 2019-10-15 08:09:32 -04:00
.makefile makefile: clone single pb branch by default 2021-03-23 17:28:46 -06:00
build.md build guide: Chez Scheme for Racket is no longer in a separate repo 2021-04-07 06:50:42 -06:00
LICENSE update LICENSE to use "CS" and "BC" 2021-01-15 09:32:59 -07:00
Makefile makefile: clone single pb branch by default 2021-03-23 17:28:46 -06:00
README.md Fix README 2020-09-06 09:03:42 -04:00

README.md

Racket is a general-purpose programming language and an ecosystem for language-oriented programming.

This repository holds the source code for the core of Racket plus some related packages. The rest of the Racket distribution source code is in other repositories, mostly under the Racket GitHub organization.

Quick Start

Pre-built versions of Racket for a variety of operating systems and architectures, as well as convenient source distributions are available at

https://download.racket-lang.org

Racket comes with extensive documentation, including several tutorials. You can read all of this documentation, as well as documentation for third-party packages at

https://docs.racket-lang.org

Building from Source

For information on building Racket from this repository, see the Build Guide.

Contributing

Contribute to Racket by submitting a pull request, joining the development mailing list, or visiting the IRC or Slack channels.

By making a contribution, you are agreeing that your contribution is licensed under the LGPLv3, Apache 2.0, and MIT licenses. Those licenses are available in this repository in the files racket/src/LICENSE-LGPL.txt, racket/src/LICENSE-APACHE.txt, and racket/src/LICENSE-MIT.txt.

See the Racket Build Guide for more guidance on contributing.

The Friendly Environment Policy contains guidelines on expected behavior within the Racket community.

License

Racket is free software; see LICENSE for more details.