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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 available under the standard |
| <a href="http://llvm.org/docs/DeveloperPolicy.html#license">LLVM |
| License</a>, a "BSD-style" license.</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 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> |
| |
| <!--=====================================================================--> |
| <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>cd compiler-rt</li> |
| <li>make</li> |
| </ul> |
| |
| <p>Note that the library will probably only build out of the box on Darwin, |
| but patches to improve portability are definitely welcome.</p> |
| |
| <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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