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Palmer Cox 6386f887a7 Crypto: update checked addition functions to use CheckedAdd intrinsic. The shift_add_check_overflow and shift_add_check_overflow_tuple functions are re-written to be more efficient and to make use of the CheckedAdd instrinsic instead of manually checking for integer overflow. * The invokation leading_zeros() is removed and replaced with simple integer comparison. The leading_zeros() method results in a ctpop LLVM instruction and it may not be efficient on all architectures; integer comparisons, however, are efficient on just about any architecture. * The methods lose the ability for the caller to specify a particular shift value - that functionality wasn't being used and removing it allows for the code to be simplified. * Finally, the methods are renamed to add_bytes_to_bits and add_bytes_to_bits_tuple to reflect their very specific purposes.		2013-08-17 00:22:27 -04:00
doc	update the iterator tutorial	2013-08-15 21:12:34 -04:00
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src	Crypto: update checked addition functions to use CheckedAdd intrinsic.	2013-08-17 00:22:27 -04:00
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README.md

The Rust Programming Language

This is a compiler for Rust, including standard libraries, tools and documentation.

Quick Start

Windows

Download and use the installer.
Read the tutorial.
Enjoy!

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-0.7.tar.gz
 $ tar -xzf rust-0.7.tar.gz
 $ cd rust-0.7
```
Or to build from the repo do:
```
 $ git clone https://github.com/mozilla/rust.git
 $ cd rust
```
Now that you have Rust's source code, you can configure and build it:
```
 $ ./configure
 $ make && make install
```
You may need to use sudo make install if you do not normally have permission to modify the destination directory. The install locations can be adjusted by passing a --prefix argument to configure. Various other options are also supported, pass --help for more information on them.

When complete, make install will place several programs into /usr/local/bin: rustc, the Rust compiler; rustdoc, the API-documentation tool, and rustpkg, 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.