f411b94ce1
Instead of reading a byte at a time in a loop we hardcode how to read each size.
We also try to do as few reads as possible by reading as big primitive types as
possible. For example if size is eight we do a single read of a u64 value and
if size is seven we read it as [u32|u16|u8].
Timings on a Intel(R) Core(TM) i5-3570K CPU @ 3.40GHz
-- Before --
running 7 tests
test io::extensions::test::test_u64_from_be_bytes ... ok
test io::extensions::bench::u64_from_be_bytes_4_aligned ... bench: 386 ns/iter (+/- 5)
test io::extensions::bench::u64_from_be_bytes_4_unaligned ... bench: 387 ns/iter (+/- 2)
test io::extensions::bench::u64_from_be_bytes_7_aligned ... bench: 628 ns/iter (+/- 1)
test io::extensions::bench::u64_from_be_bytes_7_unaligned ... bench: 637 ns/iter (+/- 3)
test io::extensions::bench::u64_from_be_bytes_8_aligned ... bench: 727 ns/iter (+/- 18)
test io::extensions::bench::u64_from_be_bytes_8_unaligned ... bench: 723 ns/iter (+/- 22)
callgrind rustc -S rust/src/test/bench/sudoku.rs
u64_from_be_bytes self: 4.37%
-- After --
running 7 tests
test io::extensions::test::test_u64_from_be_bytes ... ok
test io::extensions::bench::u64_from_be_bytes_4_aligned ... bench: 162 ns/iter (+/- 7)
test io::extensions::bench::u64_from_be_bytes_4_unaligned ... bench: 164 ns/iter (+/- 7)
test io::extensions::bench::u64_from_be_bytes_7_aligned ... bench: 201 ns/iter (+/- 7)
test io::extensions::bench::u64_from_be_bytes_7_unaligned ... bench: 210 ns/iter (+/- 9)
test io::extensions::bench::u64_from_be_bytes_8_aligned ... bench: 163 ns/iter (+/- 7)
test io::extensions::bench::u64_from_be_bytes_8_unaligned ... bench: 163 ns/iter (+/- 10)
callgrind rustc -S rust/src/test/bench/sudoku.rs
u64_from_be_bytes self: 1.78%
The Rust Programming Language
This is a compiler for Rust, including standard libraries, tools and documentation.
Quick Start
Windows
Note: Windows users should read the detailed getting started notes on the wiki. Even when using the binary installer the Windows build requires a MinGW installation, the precise details of which are not discussed here.
Linux / OS X
-
Install the prerequisites (if not already installed)
- g++ 4.4 or clang++ 3.x
- python 2.6 or later (but not 3.x)
- perl 5.0 or later
- gnu make 3.81 or later
- curl
-
Download and build Rust You can either download a tarball or build directly from the repo.
To build from the tarball do:
$ curl -O http://static.rust-lang.org/dist/rust-0.9.tar.gz $ tar -xzf rust-0.9.tar.gz $ cd rust-0.9Or to build from the repo do:
$ git clone https://github.com/mozilla/rust.git $ cd rustNow that you have Rust's source code, you can configure and build it:
$ ./configure $ make && make installYou may need to use
sudo make installif you do not normally have permission to modify the destination directory. The install locations can be adjusted by passing a--prefixargument toconfigure. Various other options are also supported, pass--helpfor more information on them.When complete,
make installwill place several programs into/usr/local/bin:rustc, the Rust compiler;rustdoc, the API-documentation tool, andrustpkg, the Rust package manager and build system. -
Read the tutorial.
-
Enjoy!
Notes
Since the Rust compiler is written in Rust, it must be built by a precompiled "snapshot" version of itself (made in an earlier state of development). As such, source builds require a connection to the Internet, to fetch snapshots, and an OS that can execute the available snapshot binaries.
Snapshot binaries are currently built and tested on several platforms:
- Windows (7, Server 2008 R2), x86 only
- Linux (various distributions), x86 and x86-64
- OSX 10.6 ("Snow Leopard") or greater, x86 and x86-64
You may find that other platforms work, but these are our "tier 1" supported build environments that are most likely to work.
Rust currently needs about 1.8G of RAM to build without swapping; if it hits swap, it will take a very long time to build.
There is lots more documentation in the wiki.
License
Rust is primarily distributed under the terms of both the MIT license and the Apache License (Version 2.0), with portions covered by various BSD-like licenses.
See LICENSE-APACHE, LICENSE-MIT, and COPYRIGHT for details.