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Chris Lattnerc1346742009-07-01 17:16:20 +0000[diff] [blame^]7 <title>"compiler-rt" Runtime Library</title>
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Chris Lattnerc1346742009-07-01 17:16:20 +0000[diff] [blame^]15 <h1>"compiler-rt" Runtime Library</h1>
Chris Lattnerff5380f2009-06-30 22:56:43 +0000[diff] [blame]16 <!--*********************************************************************-->
17
Chris Lattnerc1346742009-07-01 17:16:20 +0000[diff] [blame^]18 <p>The compiler-rt project is a simple library that provides an implementation
Chris Lattnerff5380f2009-06-30 22:56:43 +0000[diff] [blame]19 of the low-level target-specific hooks required by code generation and
20 other runtime components. For example, when compiling for a 32-bit target,
21 converting a double to a 64-bit unsigned integer is compiling into a runtime
Chris Lattnerc1346742009-07-01 17:16:20 +0000[diff] [blame^]22 call to the "__fixunsdfdi" function. The compiler-rt library provides
Chris Lattnerff5380f2009-06-30 22:56:43 +0000[diff] [blame]23 optimized implementations of this and other low-level routines.</p>
24
25 <!--=====================================================================-->
26 <h2 id="goals">Goals</h2>
27 <!--=====================================================================-->
28
Chris Lattnerc1346742009-07-01 17:16:20 +0000[diff] [blame^]29 <p>Different targets require different routines. The compiler-rt project aims
Chris Lattnerff5380f2009-06-30 22:56:43 +0000[diff] [blame]30 to implement these routines in both target-independent C form as well as
31 providing heavily optimized assembly versions of the routines in some
Chris Lattnerc1346742009-07-01 17:16:20 +0000[diff] [blame^]32 cases. It should be very easy to bring compiler-rt to support a new
Chris Lattnerff5380f2009-06-30 22:56:43 +0000[diff] [blame]33 target by adding the new routines needed by that target.</p>
34
Chris Lattnerc1346742009-07-01 17:16:20 +0000[diff] [blame^]35 <p>Where it make sense, the compiler-rt project aims to implement interfaces
Chris Lattnerff5380f2009-06-30 22:56:43 +0000[diff] [blame]36 that are drop-in compatible with the libgcc interfaces.</p>
37
38 <!--=====================================================================-->
39 <h2 id="features">Features</h2>
40 <!--=====================================================================-->
41
Chris Lattnerc1346742009-07-01 17:16:20 +0000[diff] [blame^]42 <p>The current feature set of compiler-rt is:</p>
Chris Lattnerff5380f2009-06-30 22:56:43 +0000[diff] [blame]43
44 <ul>
45 <li>Full support for the libgcc interfaces required by these targets:
46 <ul>
47 <li>Darwin i386</li>
48 <li>Darwin X86-64</li>
49 <li>Darwin PowerPC</li>
50 <li>Darwin PowerPC 64</li>
51 </ul></li>
52
53 <li>High performance hand tuned implementations of commonly used functions
54 like __floatundidf in assembly that are dramatically faster than the
55 libgcc implementations.</li>
56 <li>A target-independent implementation of the Apple "Blocks" runtime
57 interfaces.</li>
58 </ul>
59
60 <!--=====================================================================-->
61 <h2>Get it and get involved!</h2>
62 <!--=====================================================================-->
63
Chris Lattnerc1346742009-07-01 17:16:20 +0000[diff] [blame^]64 <p>To check out the code, use:</p>
65
66 <ul>
67 <li>svn co http://llvm.org/svn/llvm-project/compiler-rt/trunk compiler-rt</li>
68 <li>cd compiler-rt</li>
69 <li>make</li>
70 </ul>
71
72 <p>Note that the library will probably only build out of the box on Darwin,
73 but patches to improve portability are definitely welcome.</p>
74
75 <p>compiler-rt doesn't have its own mailing list, if you have questions please
76 email the <a
77 href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">llvmdev</a> mailing
78 list. Commits to the compiler-rt SVN module are automatically sent to the
79 <a
80 href="http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits">llvm-commits</a>
81 mailing list.</p>
Chris Lattnerff5380f2009-06-30 22:56:43 +0000[diff] [blame]82</div>
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