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  <title>"compiler_rt" Runtime Library</title>
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  <h1>"compiler_rt" Runtime Library</h1>
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  <p>The compiler_rt project is a simple library that provides an implementation
     of the low-level target-specific hooks required by code generation and
     other runtime components.  For example, when compiling for a 32-bit target,
    converting a double to a 64-bit unsigned integer is compiling into a runtime
    call to the "__fixunsdfdi" function.  The compiler_rt library provides
    optimized implementations of this and other low-level routines.</p>
  
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  <h2 id="goals">Goals</h2>
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  <p>Different targets require different routines.  The compiler_rt project aims
     to implement these routines in both target-independent C form as well as
     providing heavily optimized assembly versions of the routines in some
     cases.  It should be very easy to bring compiler_rt to support a new
     target by adding the new routines needed by that target.</p>
     
  <p>Where it make sense, the compiler_rt project aims to implement interfaces
     that are drop-in compatible with the libgcc interfaces.</p>

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  <h2 id="features">Features</h2>
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   <p>The current feature set of compiler_rt is:</p>

   <ul>
    <li>Full support for the libgcc interfaces required by these targets:
      <ul>
      <li>Darwin i386</li>
      <li>Darwin X86-64</li>
      <li>Darwin PowerPC</li>
      <li>Darwin PowerPC 64</li>
      </ul></li>
      
    <li>High performance hand tuned implementations of commonly used functions
        like __floatundidf in assembly that are dramatically faster than the
        libgcc implementations.</li>
    <li>A target-independent implementation of the Apple "Blocks" runtime
        interfaces.</li>
   </ul>
  
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  <h2>Get it and get involved!</h2>
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  <p>TODO.</p>
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