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-  <title>Clang - Performance</title>
-  <link type="text/css" rel="stylesheet" href="menu.css">
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-<!--*************************************************************************-->
-<h1>Clang - Performance</h1>
-<!--*************************************************************************-->
-
-<p>This page shows the compile time performance of Clang on two
-interesting benchmarks:</p>
-<ul>
-  <li><i>Sketch</i>: The Objective-C example application shipped on
-    Mac OS X as part of Xcode. <i>Sketch</i> is indicative of a
-    "typical" Objective-C app. The source itself has a relatively
-    small amount of code (~7,500 lines of source code), but it relies
-    on the extensive Cocoa APIs to build its functionality. Like many
-    Objective-C applications, it includes <tt>Cocoa/Cocoa.h</tt> in
-    all of its source files, which represents a significant stress
-    test of the front-end's performance on lexing, preprocessing,
-    parsing, and syntax analysis.</li>
-  <li><i>176.gcc</i>: This is the gcc-2.7.2.2 code base as present in
-    SPECINT 2000. In contrast to Sketch, <i>176.gcc</i> consists of a
-    large amount of C source code (~200,000 lines) with few system
-    dependencies. This stresses the back-end's performance on generating
-    assembly code and debug information.</li>
-</ul>
-
-<p>
-For previous performance numbers, please
-go <a href="performance-2009-03-02.html">here</a>.
-</p>
-
-<!--*************************************************************************-->
-<h2><a name="experiments">Experiments</a></h2>
-<!--*************************************************************************-->
-
-<p>Measurements are done by running a full build (using xcodebuild or
-make for Sketch and 176.gcc respectively) using Clang and gcc 4.2 as
-compilers.</p>
-
-<p>In order to track the performance of various subsystems the timings
-have been broken down into separate stages where possible. This is
-done by over-riding the CC environment variable used during the build
-to point to one of a few simple shell scripts which may skip part of
-the build.</p>
-
-<ul>
-  <li><tt>non-compiler</tt>: The overhead of the build system itself;
-    for Sketch this also includes the time to build/copy various
-    non-source code resource files.</li>
-  <li><tt>+ driver</tt>: Add execution of the driver, but do not execute any
-    commands (by using the -### driver option).</li>
-  <li><tt>+ pch gen</tt>: Add generation of PCH files (if used).</li>
-  <li><tt>+ syntax</tt>: Add preprocessing, parsing, and semantic checking of
-    source files.</li>
-  <li><tt>+ IRgen</tt>: Add generation of LLVM IR (gcc has no
-    corresponding phase).</li>
-  <li><tt>+ codegen</tt>: Add generation of assembler files.</li>
-  <li><tt>+ assembler</tt>: Add assembler time to generate .o files.</li>
-  <li><tt>+ linker</tt>: Add linker time.</li>
-</ul>
-
-<p>This set of stages is chosen to be approximately additive, that is each
-subsequent stage simply adds some additional processing. The timings measure the
-delta of the given stage from the previous one. For example, the timings
-for <tt>+ syntax</tt> below show the difference of running with <tt>+
-syntax</tt> versus the times for <tt>+ pch gen</tt>. This amounts to a fairly
-accurate measure of only the time to perform preprocessing, parsing, and
-semantic analysis after PCH generation is done.</p>
-
-<!--*************************************************************************-->
-<h2><a name="timings">Timing Results</a></h2>
-<!--*************************************************************************-->
-
-<!--=======================================================================-->
-<h3><a name="2009-06-26">2009-06-26</a></h3>
-<!--=======================================================================-->
-
-<a href="timing-data/2009-06-26/sketch.pdf">
-<img class="img_slide" 
-     src="timing-data/2009-06-26/sketch.png" alt="Sketch Timings">
-</a>
-
-<a href="timing-data/2009-06-26/176.gcc.pdf">
-<img class="img_slide" 
-     src="timing-data/2009-06-26/176.gcc.png" alt="176.gcc Timings">
-</a>
-
-</div>
-</body>
-</html>