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   <!--*********************************************************************-->
   <h1>"compiler-rt" Runtime Library</h1>
   <!--*********************************************************************-->

   <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>

   <p>All of the code in the compiler-rt project is <a
      href="http://llvm.org/docs/DeveloperPolicy.html#license">dual licensed</a>
      under the MIT license and the UIUC License (a BSD-like license).</p>

   <!--=====================================================================-->
   <h2 id="users">Clients</h2>
   <!--=====================================================================-->

   <p>Currently compiler-rt is primarily used by
     the <a href="http://clang.llvm.org">Clang</a>
     and <a href="http://llvm.org">LLVM</a> projects as the implementation for
     the runtime compiler support libraries. The library currently provides both
     the low-level target-specific hooks required by code generation, as well as
     additional modules for supporting the runtime requirements of features like
     code coverage, profiling, or address sanitizer (ASAN) instrumentation.</p>

   <p>For more information on using compiler-rt with Clang, please see the Clang
     <a href="http://clang.llvm.org/get_started.html">Getting Started</a>
     page.</p>

   <!--=====================================================================-->
   <h2 id="goals">Goals</h2>
   <!--=====================================================================-->

   <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>

   <!--=====================================================================-->
   <h2 id="features">Features</h2>
   <!--=====================================================================-->

    <p>The current feature set of compiler-rt is:</p>

    <ul>
     <li>Full support for the libgcc interfaces on supported targets.</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>

   <!--=====================================================================-->
   <h2 id="requirements">Platform Support</h2>
   <!--=====================================================================-->

    <p>Compiler-RT is known to work on the following platforms:</p>

    <li>Machine Architectures:
     <ul>
      <li>i386</li>
      <li>X86-64</li>
      <li>SPARC64</li>
      <li>ARM</li>
      <li>PowerPC</li>
      <li>PowerPC 64</li>
     </ul></li>

    <table cellpadding="3" summary="Known Compiler-RT platforms">
    <tr>
      <th>OS</th>
      <th>Arch</th>
    </tr>
    <tr>
      <td>AuroraUX</td>
      <td>All<sup>
    </tr>
    <tr>
      <td>DragonFlyBSD</td>
      <td>All<sup>
    </tr>
    <tr>
      <td>FreeBSD</td>
      <td>All<sup>
    </tr>
    <tr>
      <td>NetBSD</td>
      <td>All<sup>
    </tr>
    <tr>
      <td>Linux</td>
      <td>All<sup>
    </tr>
    <tr>
      <td>Darwin</td>
      <td>All<sup>
    </tr>
    </table>

   <!--=====================================================================-->
   <h2 id="dir-structure">Source Structure</h2>
   <!--=====================================================================-->

    <p>A short explanation of the directory structure of compiler-rt:</p>

    <p>For testing it is possible to build a generic library and an optimized library.
        The optimized library is formed by overlaying the optimized versions onto the generic library.
        Of course, some architectures have additional functions,
        so the optimized library may have functions not found in the generic version.</p>

    <ul>
     <li> lib/ Is a generic portable implementations.</li>
     <li> lib/(arch) has optimized version for the supported architectures.</li>
    </ul>

   <!--=====================================================================-->
   <h2>Get it and get involved!</h2>
   <!--=====================================================================-->

   <p>To check out the code, use:</p>

   <ul>
   <li>svn co http://llvm.org/svn/llvm-project/compiler-rt/trunk compiler-rt</li>
   <li>mkdir build</li>
   <li>cd build</li>
   <li>cmake ../compiler-rt</li>
   <li>make</li>
   </ul>

   <p>To run the Compiler-RT Test Suit (recommended):</p>

   <ul>
   <li>ctest</li>
   </ul>

   <p>To Install:</p>

   <ul>
   <li>make install</li>
   </ul>

   <p>compiler-rt doesn't have its own mailing list, if you have questions please
      email the <a
     href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">llvmdev</a> mailing
     list.  Commits to the compiler-rt SVN module are automatically sent to the
     <a
   href="http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits">llvm-commits</a>
     mailing list.</p>
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	<title>"compiler-rt" Runtime Library</title>
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	<body>
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	<div id="content">
	<!--*********************************************************************-->
	<h1>"compiler-rt" Runtime Library</h1>
	<!--*********************************************************************-->

	<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>

	<p>All of the code in the compiler-rt project is <a
	href="http://llvm.org/docs/DeveloperPolicy.html#license">dual licensed</a>
	under the MIT license and the UIUC License (a BSD-like license).</p>

	<!--=====================================================================-->
	<h2 id="users">Clients</h2>
	<!--=====================================================================-->

	<p>Currently compiler-rt is primarily used by
	the <a href="http://clang.llvm.org">Clang</a>
	and <a href="http://llvm.org">LLVM</a> projects as the implementation for
	the runtime compiler support libraries. The library currently provides both
	the low-level target-specific hooks required by code generation, as well as
	additional modules for supporting the runtime requirements of features like
	code coverage, profiling, or address sanitizer (ASAN) instrumentation.</p>

	<p>For more information on using compiler-rt with Clang, please see the Clang
	<a href="http://clang.llvm.org/get_started.html">Getting Started</a>
	page.</p>

	<!--=====================================================================-->
	<h2 id="goals">Goals</h2>
	<!--=====================================================================-->

	<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>

	<!--=====================================================================-->
	<h2 id="features">Features</h2>
	<!--=====================================================================-->

	<p>The current feature set of compiler-rt is:</p>

	<ul>
	<li>Full support for the libgcc interfaces on supported targets.</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>

	<!--=====================================================================-->
	<h2 id="requirements">Platform Support</h2>
	<!--=====================================================================-->

	<p>Compiler-RT is known to work on the following platforms:</p>

	<li>Machine Architectures:
	<ul>
	<li>i386</li>
	<li>X86-64</li>
	<li>SPARC64</li>
	<li>ARM</li>
	<li>PowerPC</li>
	<li>PowerPC 64</li>
	</ul></li>

	<table cellpadding="3" summary="Known Compiler-RT platforms">
	<tr>
	<th>OS</th>
	<th>Arch</th>
	</tr>
	<tr>
	<td>AuroraUX</td>
	<td>All<sup>
	</tr>
	<tr>
	<td>DragonFlyBSD</td>
	<td>All<sup>
	</tr>
	<tr>
	<td>FreeBSD</td>
	<td>All<sup>
	</tr>
	<tr>
	<td>NetBSD</td>
	<td>All<sup>
	</tr>
	<tr>
	<td>Linux</td>
	<td>All<sup>
	</tr>
	<tr>
	<td>Darwin</td>
	<td>All<sup>
	</tr>
	</table>

	<!--=====================================================================-->
	<h2 id="dir-structure">Source Structure</h2>
	<!--=====================================================================-->

	<p>A short explanation of the directory structure of compiler-rt:</p>

	<p>For testing it is possible to build a generic library and an optimized library.
	The optimized library is formed by overlaying the optimized versions onto the generic library.
	Of course, some architectures have additional functions,
	so the optimized library may have functions not found in the generic version.</p>

	<ul>
	<li> lib/ Is a generic portable implementations.</li>
	<li> lib/(arch) has optimized version for the supported architectures.</li>
	</ul>

	<!--=====================================================================-->
	<h2>Get it and get involved!</h2>
	<!--=====================================================================-->

	<p>To check out the code, use:</p>

	<ul>
	<li>svn co http://llvm.org/svn/llvm-project/compiler-rt/trunk compiler-rt</li>
	<li>mkdir build</li>
	<li>cd build</li>
	<li>cmake ../compiler-rt</li>
	<li>make</li>
	</ul>

	<p>To run the Compiler-RT Test Suit (recommended):</p>

	<ul>
	<li>ctest</li>
	</ul>

	<p>To Install:</p>

	<ul>
	<li>make install</li>
	</ul>

	<p>compiler-rt doesn't have its own mailing list, if you have questions please
	email the <a
	href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">llvmdev</a> mailing
	list. Commits to the compiler-rt SVN module are automatically sent to the
	<a
	href="http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits">llvm-commits</a>
	mailing list.</p>
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