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bors a41178e858 Auto merge of #27110 - arthurprs:optintstr, r=Gankro I wrote a reasonably optimized version for both functions. Further optimizations are possible but I tried to keep the code size small (which I think is important), it's a road of diminished gains. The repository used for testing/benchmarks is https://github.com/arthurprs/rust-optimized-inttostr Benchmarks are ran for 3 different distributions, bellow are string length histograms for the u32 type * _h (big numbers skew) [0, 0, 5, 29, 103, 212, 551, 1138, 1887, 3196, 2879] * _m (slight small number skew): [0, 2807, 1334, 1057, 905, 821, 772, 707, 627, 605, 365] * _l (small numbers skew): [0, 8004, 567, 351, 248, 212, 170, 126, 136, 112, 74] Tested processors are * x64 laptop (i7-2670QM) * x32 server (Digital Ocean E5-2630L-v2) ### Display It uses a small look up table (200 bytes) and decode up to 4 characters at a time. I also took special precautions to reduce 64bit arithmetic on 32bit architectures and the gains are huge in these cases. Overall, on modern 64bit CPUs it's pretty much the same speed as the stdlib implementation for very small numbers (0..99), but pulls ahead as the length of the decimal increases. On slight older CPUs (w/ worse ALUs) or 32bit architectures it's pretty much always faster. x64 benchmarks ``` test bench::display_h_new_u08 ... bench: 71,041 ns/iter (+/- 2,894) test bench::display_h_new_u16 ... bench: 378,255 ns/iter (+/- 36,547) test bench::display_h_new_u32 ... bench: 4,232,483 ns/iter (+/- 509,661) test bench::display_h_new_u64 ... bench: 5,166,740 ns/iter (+/- 421,124) test bench::display_h_stdlib_u08 ... bench: 73,536 ns/iter (+/- 5,287) test bench::display_h_stdlib_u16 ... bench: 451,443 ns/iter (+/- 16,879) test bench::display_h_stdlib_u32 ... bench: 5,551,070 ns/iter (+/- 518,151) test bench::display_h_stdlib_u64 ... bench: 8,624,374 ns/iter (+/- 643,701) test bench::display_l_new_u08 ... bench: 71,547 ns/iter (+/- 504) test bench::display_l_new_u16 ... bench: 399,727 ns/iter (+/- 28,030) test bench::display_l_new_u32 ... bench: 4,365,303 ns/iter (+/- 414,414) test bench::display_l_new_u64 ... bench: 5,302,382 ns/iter (+/- 292,324) test bench::display_l_stdlib_u08 ... bench: 75,445 ns/iter (+/- 2,487) test bench::display_l_stdlib_u16 ... bench: 444,313 ns/iter (+/- 16,203) test bench::display_l_stdlib_u32 ... bench: 5,761,801 ns/iter (+/- 387,186) test bench::display_l_stdlib_u64 ... bench: 8,790,365 ns/iter (+/- 614,846) test bench::display_m_new_u08 ... bench: 71,820 ns/iter (+/- 2,956) test bench::display_m_new_u16 ... bench: 399,649 ns/iter (+/- 20,643) test bench::display_m_new_u32 ... bench: 4,355,561 ns/iter (+/- 179,189) test bench::display_m_new_u64 ... bench: 5,070,594 ns/iter (+/- 341,950) test bench::display_m_stdlib_u08 ... bench: 74,900 ns/iter (+/- 1,909) test bench::display_m_stdlib_u16 ... bench: 448,788 ns/iter (+/- 20,791) test bench::display_m_stdlib_u32 ... bench: 5,717,939 ns/iter (+/- 316,824) test bench::display_m_stdlib_u64 ... bench: 8,787,160 ns/iter (+/- 482,864) ``` x86 benchmarks ``` test bench::display_h_new_u08 ... bench: 94,246 ns/iter (+/- 34,872) test bench::display_h_new_u16 ... bench: 533,805 ns/iter (+/- 22,499) test bench::display_h_new_u32 ... bench: 6,127,747 ns/iter (+/- 2,192,789) test bench::display_h_new_u64 ... bench: 14,994,203 ns/iter (+/- 1,609,345) test bench::display_h_stdlib_u08 ... bench: 107,233 ns/iter (+/- 8,571) test bench::display_h_stdlib_u16 ... bench: 631,186 ns/iter (+/- 11,332) test bench::display_h_stdlib_u32 ... bench: 7,696,344 ns/iter (+/- 957,917) test bench::display_h_stdlib_u64 ... bench: 45,677,401 ns/iter (+/- 4,991,344) test bench::display_l_new_u08 ... bench: 95,855 ns/iter (+/- 27,735) test bench::display_l_new_u16 ... bench: 532,084 ns/iter (+/- 40,479) test bench::display_l_new_u32 ... bench: 5,973,953 ns/iter (+/- 211,676) test bench::display_l_new_u64 ... bench: 14,773,064 ns/iter (+/- 1,276,579) test bench::display_l_stdlib_u08 ... bench: 106,350 ns/iter (+/- 63,963) test bench::display_l_stdlib_u16 ... bench: 637,746 ns/iter (+/- 101,005) test bench::display_l_stdlib_u32 ... bench: 7,740,640 ns/iter (+/- 848,478) test bench::display_l_stdlib_u64 ... bench: 44,846,932 ns/iter (+/- 4,514,694) test bench::display_m_new_u08 ... bench: 94,549 ns/iter (+/- 13,029) test bench::display_m_new_u16 ... bench: 546,030 ns/iter (+/- 35,804) test bench::display_m_new_u32 ... bench: 5,983,924 ns/iter (+/- 1,180,559) test bench::display_m_new_u64 ... bench: 14,817,873 ns/iter (+/- 2,271,464) test bench::display_m_stdlib_u08 ... bench: 107,806 ns/iter (+/- 8,805) test bench::display_m_stdlib_u16 ... bench: 630,714 ns/iter (+/- 6,586) test bench::display_m_stdlib_u32 ... bench: 7,784,210 ns/iter (+/- 358,601) test bench::display_m_stdlib_u64 ... bench: 46,223,927 ns/iter (+/- 6,553,176) ``` ### from_str_radix (FromStr) All valid digits are ascii so I modified the function to use the underlining bytes instead and simplified the match to avoid wasting cycles. x64 benchmarks ``` test bench::from_str_h_new_u08 ... bench: 28,153 ns/iter (+/- 624) test bench::from_str_h_new_u16 ... bench: 223,513 ns/iter (+/- 11,554) test bench::from_str_h_new_u32 ... bench: 3,098,935 ns/iter (+/- 231,022) test bench::from_str_h_new_u64 ... bench: 5,009,900 ns/iter (+/- 341,961) test bench::from_str_h_stdlib_u08 ... bench: 34,033 ns/iter (+/- 2,068) test bench::from_str_h_stdlib_u16 ... bench: 248,785 ns/iter (+/- 14,208) test bench::from_str_h_stdlib_u32 ... bench: 4,150,536 ns/iter (+/- 266,070) test bench::from_str_h_stdlib_u64 ... bench: 6,817,997 ns/iter (+/- 449,838) test bench::from_str_l_new_u08 ... bench: 27,552 ns/iter (+/- 1,500) test bench::from_str_l_new_u16 ... bench: 234,360 ns/iter (+/- 13,144) test bench::from_str_l_new_u32 ... bench: 3,140,261 ns/iter (+/- 248,175) test bench::from_str_l_new_u64 ... bench: 5,176,583 ns/iter (+/- 350,416) test bench::from_str_l_stdlib_u08 ... bench: 35,060 ns/iter (+/- 2,154) test bench::from_str_l_stdlib_u16 ... bench: 252,135 ns/iter (+/- 23,461) test bench::from_str_l_stdlib_u32 ... bench: 4,154,599 ns/iter (+/- 369,606) test bench::from_str_l_stdlib_u64 ... bench: 6,892,767 ns/iter (+/- 213,030) test bench::from_str_m_new_u08 ... bench: 28,252 ns/iter (+/- 1,384) test bench::from_str_m_new_u16 ... bench: 231,051 ns/iter (+/- 16,540) test bench::from_str_m_new_u32 ... bench: 3,166,504 ns/iter (+/- 134,418) test bench::from_str_m_new_u64 ... bench: 5,103,195 ns/iter (+/- 218,912) test bench::from_str_m_stdlib_u08 ... bench: 35,012 ns/iter (+/- 2,735) test bench::from_str_m_stdlib_u16 ... bench: 250,967 ns/iter (+/- 14,708) test bench::from_str_m_stdlib_u32 ... bench: 4,101,845 ns/iter (+/- 205,802) test bench::from_str_m_stdlib_u64 ... bench: 6,823,001 ns/iter (+/- 267,215) ``` x86 benchmarks ``` test bench::from_str_h_new_u08 ... bench: 23,682 ns/iter (+/- 3,590) test bench::from_str_h_new_u16 ... bench: 190,916 ns/iter (+/- 29,688) test bench::from_str_h_new_u32 ... bench: 2,649,952 ns/iter (+/- 308,576) test bench::from_str_h_new_u64 ... bench: 23,458,434 ns/iter (+/- 2,327,427) test bench::from_str_h_stdlib_u08 ... bench: 45,551 ns/iter (+/- 6,968) test bench::from_str_h_stdlib_u16 ... bench: 313,739 ns/iter (+/- 17,175) test bench::from_str_h_stdlib_u32 ... bench: 4,615,669 ns/iter (+/- 470,766) test bench::from_str_h_stdlib_u64 ... bench: 30,589,482 ns/iter (+/- 2,278,996) test bench::from_str_l_new_u08 ... bench: 23,763 ns/iter (+/- 5,545) test bench::from_str_l_new_u16 ... bench: 185,472 ns/iter (+/- 33,097) test bench::from_str_l_new_u32 ... bench: 2,691,307 ns/iter (+/- 473,886) test bench::from_str_l_new_u64 ... bench: 22,952,593 ns/iter (+/- 1,963,742) test bench::from_str_l_stdlib_u08 ... bench: 45,285 ns/iter (+/- 16,337) test bench::from_str_l_stdlib_u16 ... bench: 313,624 ns/iter (+/- 6,643) test bench::from_str_l_stdlib_u32 ... bench: 4,595,679 ns/iter (+/- 1,876,361) test bench::from_str_l_stdlib_u64 ... bench: 30,434,683 ns/iter (+/- 1,901,996) test bench::from_str_m_new_u08 ... bench: 23,812 ns/iter (+/- 1,505) test bench::from_str_m_new_u16 ... bench: 185,553 ns/iter (+/- 19,788) test bench::from_str_m_new_u32 ... bench: 2,614,920 ns/iter (+/- 66,230) test bench::from_str_m_new_u64 ... bench: 23,241,778 ns/iter (+/- 3,474,077) test bench::from_str_m_stdlib_u08 ... bench: 45,634 ns/iter (+/- 1,436) test bench::from_str_m_stdlib_u16 ... bench: 316,479 ns/iter (+/- 21,212) test bench::from_str_m_stdlib_u32 ... bench: 4,609,147 ns/iter (+/- 487,068) test bench::from_str_m_stdlib_u64 ... bench: 30,165,173 ns/iter (+/- 1,601,830) ```		2015-07-19 19:04:15 +00:00
man	Update rustc manpage.	2015-05-26 16:29:32 -07:00
mk	adding support for i686-unknown-freebsd target	2015-07-11 00:23:04 -07:00
src	Auto merge of #27110 - arthurprs:optintstr, r=Gankro	2015-07-19 19:04:15 +00:00
.gitattributes	webfonts: proper fix	2014-07-08 20:29:36 +02:00
.gitignore	Ignore KDevelop 4 (and 5 pre-release) project files	2015-06-25 23:26:05 +00:00
.gitmodules	Use rust-installer for installation	2014-12-11 17:14:17 -08:00
.mailmap	Update AUTHORS.txt for 1.2	2015-07-09 15:28:08 -07:00
.travis.yml	Ratchet up travis to build stage1 and our own LLVM.	2015-07-15 10:48:50 -07:00
AUTHORS.txt	Update my email address.	2015-07-12 19:46:33 -04:00
configure	Rollup merge of #27028 - Gankro:travis, r=alexcrichton	2015-07-16 10:49:23 +05:30
CONTRIBUTING.md	Rollup merge of #26693 - rutsky:patch-1, r=Manishearth	2015-07-16 10:48:28 +05:30
COPYRIGHT	copyright: update paths and entries	2015-01-22 15:45:47 +01:00
LICENSE-APACHE
LICENSE-MIT	Bump LICENSE copyright year	2015-01-17 10:51:07 -05:00
Makefile.in	Rollup merge of #26645 - richo:makefile-typo, r=sfackler	2015-06-29 13:59:34 +05:30
README.md	MYSY2 -> MSYS2	2015-07-03 17:16:13 +09:00
RELEASES.md	Mention that removal of `#[packed]` was a breaking change in 1.2	2015-07-14 10:32:23 -07:00

README.md

The Rust Programming Language

Rust is a fast systems programming language that guarantees memory safety and offers painless concurrency (no data races). It does not employ a garbage collector and has minimal runtime overhead.

This repo contains the code for the compiler (rustc), as well as standard libraries, tools and documentation for Rust.

Quick Start

Read "Installing Rust" from The Book.

Building from Source

Make sure you have installed the dependencies:
- g++ 4.7 or clang++ 3.x
- python 2.6 or later (but not 3.x)
- GNU make 3.81 or later
- curl
- git

Clone the source with git:

$ git clone https://github.com/rust-lang/rust.git
$ cd rust

Build and install:
```
$ ./configure
$ make && make install
```
Note: 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, and rustdoc, the API-documentation tool. This install does not include Cargo, Rust's package manager, which you may also want to build.

Building on Windows

MSYS2 can be used to easily build Rust on Windows:

Grab the latest MSYS2 installer and go through the installer.

From the MSYS2 terminal, install the mingw64 toolchain and other required tools.

# Choose one based on platform:
$ pacman -S mingw-w64-i686-toolchain
$ pacman -S mingw-w64-x86_64-toolchain

$ pacman -S base-devel

Run mingw32_shell.bat or mingw64_shell.bat from wherever you installed MSYS2 (i.e. C:\msys), depending on whether you want 32-bit or 64-bit Rust.
Navigate to Rust's source code, configure and build it:
```
$ ./configure
$ make && make install
```

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:

Platform \ Architecture	x86	x86_64
Windows (7, 8, Server 2008 R2)	✓	✓
Linux (2.6.18 or later)	✓	✓
OSX (10.7 Lion or later)	✓	✓

You may find that other platforms work, but these are our officially supported build environments that are most likely to work.

Rust currently needs about 1.5 GiB of RAM to build without swapping; if it hits swap, it will take a very long time to build.

There is more advice about hacking on Rust in CONTRIBUTING.md.

Getting Help

The Rust community congregates in a few places:

Stack Overflow - Direct questions about using the language.
users.rust-lang.org - General discussion and broader questions.
/r/rust - News and general discussion.

Contributing

To contribute to Rust, please see CONTRIBUTING.

Rust has an IRC culture and most real-time collaboration happens in a variety of channels on Mozilla's IRC network, irc.mozilla.org. The most popular channel is #rust, a venue for general discussion about Rust, and a good place to ask for help.

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.

README.md Unescape Escape