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15  <h1>"compiler_rt" Runtime Library</h1>
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17  
18  <p>The compiler_rt project is a simple library that provides an implementation
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
22    call to the "__fixunsdfdi" function.  The compiler_rt library provides
23    optimized implementations of this and other low-level routines.</p>
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26  <h2 id="goals">Goals</h2>
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28  
29  <p>Different targets require different routines.  The compiler_rt project aims
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
32     cases.  It should be very easy to bring compiler_rt to support a new
33     target by adding the new routines needed by that target.</p>
34     
35  <p>Where it make sense, the compiler_rt project aims to implement interfaces
36     that are drop-in compatible with the libgcc interfaces.</p>
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39  <h2 id="features">Features</h2>
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41
42   <p>The current feature set of compiler_rt is:</p>
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>
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61  <h2>Get it and get involved!</h2>
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63  
64  <p>TODO.</p>
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