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1ff5380f65f639f043680868c74927c15f7428499Chris Lattner<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" 2ff5380f65f639f043680868c74927c15f7428499Chris Lattner "http://www.w3.org/TR/html4/strict.dtd"> 3ff5380f65f639f043680868c74927c15f7428499Chris Lattner<!-- Material used from: HTML 4.01 specs: http://www.w3.org/TR/html401/ --> 4ff5380f65f639f043680868c74927c15f7428499Chris Lattner<html> 5ff5380f65f639f043680868c74927c15f7428499Chris Lattner<head> 6ff5380f65f639f043680868c74927c15f7428499Chris Lattner <META http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> 7c1346747862498226b5af3c4d4bd3c4dc429d5d7Chris Lattner <title>"compiler-rt" Runtime Library</title> 8ff5380f65f639f043680868c74927c15f7428499Chris Lattner <link type="text/css" rel="stylesheet" href="menu.css"> 9ff5380f65f639f043680868c74927c15f7428499Chris Lattner <link type="text/css" rel="stylesheet" href="content.css"> 10ff5380f65f639f043680868c74927c15f7428499Chris Lattner</head> 11135bcdf9ca7584489050b23b2ee155cce6d6cce3Chris Lattner 12ff5380f65f639f043680868c74927c15f7428499Chris Lattner<body> 13ff5380f65f639f043680868c74927c15f7428499Chris Lattner<!--#include virtual="menu.html.incl"--> 14ff5380f65f639f043680868c74927c15f7428499Chris Lattner<div id="content"> 15ff5380f65f639f043680868c74927c15f7428499Chris Lattner <!--*********************************************************************--> 16c1346747862498226b5af3c4d4bd3c4dc429d5d7Chris Lattner <h1>"compiler-rt" Runtime Library</h1> 17ff5380f65f639f043680868c74927c15f7428499Chris Lattner <!--*********************************************************************--> 18ff5380f65f639f043680868c74927c15f7428499Chris Lattner 19c1346747862498226b5af3c4d4bd3c4dc429d5d7Chris Lattner <p>The compiler-rt project is a simple library that provides an implementation 20ff5380f65f639f043680868c74927c15f7428499Chris Lattner of the low-level target-specific hooks required by code generation and 21ff5380f65f639f043680868c74927c15f7428499Chris Lattner other runtime components. For example, when compiling for a 32-bit target, 22ff5380f65f639f043680868c74927c15f7428499Chris Lattner converting a double to a 64-bit unsigned integer is compiling into a runtime 23c1346747862498226b5af3c4d4bd3c4dc429d5d7Chris Lattner call to the "__fixunsdfdi" function. The compiler-rt library provides 24ff5380f65f639f043680868c74927c15f7428499Chris Lattner optimized implementations of this and other low-level routines.</p> 25eb561bef8f503f399d1a429737f5657aa6e21369Chris Lattner 26eb561bef8f503f399d1a429737f5657aa6e21369Chris Lattner <p>All of the code in the compiler-rt project is available under the standard 27eb561bef8f503f399d1a429737f5657aa6e21369Chris Lattner <a href="http://llvm.org/docs/DeveloperPolicy.html#license">LLVM 28eb561bef8f503f399d1a429737f5657aa6e21369Chris Lattner License</a>, a "BSD-style" license.</p> 29ff5380f65f639f043680868c74927c15f7428499Chris Lattner 30ff5380f65f639f043680868c74927c15f7428499Chris Lattner <!--=====================================================================--> 31ff5380f65f639f043680868c74927c15f7428499Chris Lattner <h2 id="goals">Goals</h2> 32ff5380f65f639f043680868c74927c15f7428499Chris Lattner <!--=====================================================================--> 33ff5380f65f639f043680868c74927c15f7428499Chris Lattner 34c1346747862498226b5af3c4d4bd3c4dc429d5d7Chris Lattner <p>Different targets require different routines. The compiler-rt project aims 35ff5380f65f639f043680868c74927c15f7428499Chris Lattner to implement these routines in both target-independent C form as well as 36ff5380f65f639f043680868c74927c15f7428499Chris Lattner providing heavily optimized assembly versions of the routines in some 37c1346747862498226b5af3c4d4bd3c4dc429d5d7Chris Lattner cases. It should be very easy to bring compiler-rt to support a new 38ff5380f65f639f043680868c74927c15f7428499Chris Lattner target by adding the new routines needed by that target.</p> 39ff5380f65f639f043680868c74927c15f7428499Chris Lattner 40c1346747862498226b5af3c4d4bd3c4dc429d5d7Chris Lattner <p>Where it make sense, the compiler-rt project aims to implement interfaces 41ff5380f65f639f043680868c74927c15f7428499Chris Lattner that are drop-in compatible with the libgcc interfaces.</p> 42ff5380f65f639f043680868c74927c15f7428499Chris Lattner 43ff5380f65f639f043680868c74927c15f7428499Chris Lattner <!--=====================================================================--> 44ff5380f65f639f043680868c74927c15f7428499Chris Lattner <h2 id="features">Features</h2> 45ff5380f65f639f043680868c74927c15f7428499Chris Lattner <!--=====================================================================--> 46ff5380f65f639f043680868c74927c15f7428499Chris Lattner 47c1346747862498226b5af3c4d4bd3c4dc429d5d7Chris Lattner <p>The current feature set of compiler-rt is:</p> 48ff5380f65f639f043680868c74927c15f7428499Chris Lattner 49ff5380f65f639f043680868c74927c15f7428499Chris Lattner <ul> 50ff5380f65f639f043680868c74927c15f7428499Chris Lattner <li>Full support for the libgcc interfaces required by these targets: 51ff5380f65f639f043680868c74927c15f7428499Chris Lattner <ul> 52ff5380f65f639f043680868c74927c15f7428499Chris Lattner <li>Darwin i386</li> 53ff5380f65f639f043680868c74927c15f7428499Chris Lattner <li>Darwin X86-64</li> 54ff5380f65f639f043680868c74927c15f7428499Chris Lattner <li>Darwin PowerPC</li> 55ff5380f65f639f043680868c74927c15f7428499Chris Lattner <li>Darwin PowerPC 64</li> 56ff5380f65f639f043680868c74927c15f7428499Chris Lattner </ul></li> 57ff5380f65f639f043680868c74927c15f7428499Chris Lattner 58ff5380f65f639f043680868c74927c15f7428499Chris Lattner <li>High performance hand tuned implementations of commonly used functions 59ff5380f65f639f043680868c74927c15f7428499Chris Lattner like __floatundidf in assembly that are dramatically faster than the 60ff5380f65f639f043680868c74927c15f7428499Chris Lattner libgcc implementations.</li> 61ff5380f65f639f043680868c74927c15f7428499Chris Lattner <li>A target-independent implementation of the Apple "Blocks" runtime 62ff5380f65f639f043680868c74927c15f7428499Chris Lattner interfaces.</li> 63ff5380f65f639f043680868c74927c15f7428499Chris Lattner </ul> 64ff5380f65f639f043680868c74927c15f7428499Chris Lattner 65ff5380f65f639f043680868c74927c15f7428499Chris Lattner <!--=====================================================================--> 66ff5380f65f639f043680868c74927c15f7428499Chris Lattner <h2>Get it and get involved!</h2> 67ff5380f65f639f043680868c74927c15f7428499Chris Lattner <!--=====================================================================--> 68ff5380f65f639f043680868c74927c15f7428499Chris Lattner 69c1346747862498226b5af3c4d4bd3c4dc429d5d7Chris Lattner <p>To check out the code, use:</p> 70c1346747862498226b5af3c4d4bd3c4dc429d5d7Chris Lattner 71c1346747862498226b5af3c4d4bd3c4dc429d5d7Chris Lattner <ul> 72c1346747862498226b5af3c4d4bd3c4dc429d5d7Chris Lattner <li>svn co http://llvm.org/svn/llvm-project/compiler-rt/trunk compiler-rt</li> 73c1346747862498226b5af3c4d4bd3c4dc429d5d7Chris Lattner <li>cd compiler-rt</li> 74c1346747862498226b5af3c4d4bd3c4dc429d5d7Chris Lattner <li>make</li> 75c1346747862498226b5af3c4d4bd3c4dc429d5d7Chris Lattner </ul> 76c1346747862498226b5af3c4d4bd3c4dc429d5d7Chris Lattner 77c1346747862498226b5af3c4d4bd3c4dc429d5d7Chris Lattner <p>Note that the library will probably only build out of the box on Darwin, 78c1346747862498226b5af3c4d4bd3c4dc429d5d7Chris Lattner but patches to improve portability are definitely welcome.</p> 79c1346747862498226b5af3c4d4bd3c4dc429d5d7Chris Lattner 80c1346747862498226b5af3c4d4bd3c4dc429d5d7Chris Lattner <p>compiler-rt doesn't have its own mailing list, if you have questions please 81c1346747862498226b5af3c4d4bd3c4dc429d5d7Chris Lattner email the <a 82c1346747862498226b5af3c4d4bd3c4dc429d5d7Chris Lattner href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">llvmdev</a> mailing 83c1346747862498226b5af3c4d4bd3c4dc429d5d7Chris Lattner list. Commits to the compiler-rt SVN module are automatically sent to the 84c1346747862498226b5af3c4d4bd3c4dc429d5d7Chris Lattner <a 85c1346747862498226b5af3c4d4bd3c4dc429d5d7Chris Lattner href="http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits">llvm-commits</a> 86c1346747862498226b5af3c4d4bd3c4dc429d5d7Chris Lattner mailing list.</p> 87ff5380f65f639f043680868c74927c15f7428499Chris Lattner</div> 88ff5380f65f639f043680868c74927c15f7428499Chris Lattner</body> 89ff5380f65f639f043680868c74927c15f7428499Chris Lattner</html> 90