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1197 lines
49 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
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"http://www.w3.org/TR/html4/strict.dtd">
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<html>
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<head>
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<title>LLVM Testing Infrastructure Guide</title>
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<link rel="stylesheet" href="llvm.css" type="text/css">
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</head>
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<body>
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<div class="doc_title">
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LLVM Testing Infrastructure Guide
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</div>
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<ol>
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<li><a href="#overview">Overview</a></li>
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<li><a href="#requirements">Requirements</a></li>
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<li><a href="#org">LLVM testing infrastructure organization</a>
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<ul>
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<li><a href="#regressiontests">Regression tests</a></li>
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<li><a href="#testsuite">Test suite</a></li>
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<li><a href="#debuginfotests">Debugging Information tests</a></li>
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</ul>
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</li>
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<li><a href="#quick">Quick start</a>
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<ul>
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<li><a href="#quickregressiontests">Regression tests</a></li>
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<li><a href="#quicktestsuite">Test suite</a></li>
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<li><a href="#quickdebuginfotests">Debugging Information tests</a></li>
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</ul>
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</li>
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<li><a href="#rtstructure">Regression test structure</a>
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<ul>
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<li><a href="#rtcustom">Writing new regression tests</a></li>
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<li><a href="#FileCheck">The FileCheck utility</a></li>
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<li><a href="#rtvars">Variables and substitutions</a></li>
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<li><a href="#rtfeatures">Other features</a></li>
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</ul>
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</li>
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<li><a href="#testsuitestructure">Test suite structure</a></li>
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<li><a href="#testsuiterun">Running the test suite</a>
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<ul>
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<li><a href="#testsuiteexternal">Configuring External Tests</a></li>
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<li><a href="#testsuitetests">Running different tests</a></li>
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<li><a href="#testsuiteoutput">Generating test output</a></li>
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<li><a href="#testsuitecustom">Writing custom tests for test-suite</a></li>
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</ul>
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</li>
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</ol>
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<div class="doc_author">
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<p>Written by John T. Criswell, Daniel Dunbar, Reid Spencer, and Tanya Lattner</p>
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</div>
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<!--=========================================================================-->
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<div class="doc_section"><a name="overview">Overview</a></div>
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<!--=========================================================================-->
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<div class="doc_text">
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<p>This document is the reference manual for the LLVM testing infrastructure. It
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documents the structure of the LLVM testing infrastructure, the tools needed to
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use it, and how to add and run tests.</p>
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</div>
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<!--=========================================================================-->
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<div class="doc_section"><a name="requirements">Requirements</a></div>
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<!--=========================================================================-->
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<div class="doc_text">
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<p>In order to use the LLVM testing infrastructure, you will need all of the
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software required to build LLVM, as well
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as <a href="http://python.org">Python</a> 2.4 or later.</p>
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</div>
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<!--=========================================================================-->
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<div class="doc_section"><a name="org">LLVM testing infrastructure organization</a></div>
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<!--=========================================================================-->
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<div class="doc_text">
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<p>The LLVM testing infrastructure contains two major categories of tests:
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regression tests and whole programs. The regression tests are contained inside
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the LLVM repository itself under <tt>llvm/test</tt> and are expected to always
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pass -- they should be run before every commit. The whole programs tests are
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referred to as the "LLVM test suite" and are in the <tt>test-suite</tt> module
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in subversion.
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</p>
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsection"><a name="regressiontests">Regression tests</a></div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_text">
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<p>The regression tests are small pieces of code that test a specific feature of
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LLVM or trigger a specific bug in LLVM. They are usually written in LLVM
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assembly language, but can be written in other languages if the test targets a
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particular language front end (and the appropriate <tt>--with-llvmgcc</tt>
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options were used at <tt>configure</tt> time of the <tt>llvm</tt> module). These
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tests are driven by the 'lit' testing tool, which is part of LLVM.</p>
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<p>These code fragments are not complete programs. The code generated
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from them is never executed to determine correct behavior.</p>
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<p>These code fragment tests are located in the <tt>llvm/test</tt>
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directory.</p>
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<p>Typically when a bug is found in LLVM, a regression test containing
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just enough code to reproduce the problem should be written and placed
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somewhere underneath this directory. In most cases, this will be a small
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piece of LLVM assembly language code, often distilled from an actual
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application or benchmark.</p>
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsection"><a name="testsuite">Test suite</a></div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_text">
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<p>The test suite contains whole programs, which are pieces of
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code which can be compiled and linked into a stand-alone program that can be
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executed. These programs are generally written in high level languages such as
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C or C++, but sometimes they are written straight in LLVM assembly.</p>
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<p>These programs are compiled and then executed using several different
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methods (native compiler, LLVM C backend, LLVM JIT, LLVM native code generation,
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etc). The output of these programs is compared to ensure that LLVM is compiling
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the program correctly.</p>
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<p>In addition to compiling and executing programs, whole program tests serve as
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a way of benchmarking LLVM performance, both in terms of the efficiency of the
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programs generated as well as the speed with which LLVM compiles, optimizes, and
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generates code.</p>
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<p>The test-suite is located in the <tt>test-suite</tt> Subversion module.</p>
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsection"><a name="debuginfotests">Debugging Information
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tests</a></div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_text">
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<p>The test suite contains tests to check quality of debugging information.
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The test are written in C based languages or in LLVM assembly language. </p>
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<p>These tests are compiled and run under a debugger. The debugger output
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is checked to validate of debugging information. See README.txt in the
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test suite for more information . This test suite is located in the
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<tt>debuginfo-tests</tt> Subversion module. </p>
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</div>
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<!--=========================================================================-->
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<div class="doc_section"><a name="quick">Quick start</a></div>
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<!--=========================================================================-->
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<div class="doc_text">
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<p>The tests are located in two separate Subversion modules. The regressions
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tests are in the main "llvm" module under the directory
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<tt>llvm/test</tt> (so you get these tests for free with the main llvm tree).
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The more comprehensive test suite that includes whole
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programs in C and C++ is in the <tt>test-suite</tt> module. This module should
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be checked out to the <tt>llvm/projects</tt> directory (don't use another name
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than the default "test-suite", for then the test suite will be run every time
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you run <tt>make</tt> in the main <tt>llvm</tt> directory).
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When you <tt>configure</tt> the <tt>llvm</tt> module,
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the <tt>test-suite</tt> directory will be automatically configured.
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Alternatively, you can configure the <tt>test-suite</tt> module manually.</p>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsection"><a name="quickregressiontests">Regression tests</a></div>
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<!-- _______________________________________________________________________ -->
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<p>To run all of the LLVM regression tests, use master Makefile in
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the <tt>llvm/test</tt> directory:</p>
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<div class="doc_code">
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<pre>
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% gmake -C llvm/test
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</pre>
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</div>
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<p>or</p>
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<div class="doc_code">
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<pre>
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% gmake check
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</pre>
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</div>
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<p>If you have <a href="http://clang.llvm.org">Clang</a> checked out and built,
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you can run the LLVM and Clang tests simultaneously using:</p>
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<p>or</p>
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<div class="doc_code">
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<pre>
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% gmake check-all
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</pre>
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</div>
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<p>To run the tests with Valgrind (Memcheck by default), just append
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<tt>VG=1</tt> to the commands above, e.g.:</p>
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<div class="doc_code">
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<pre>
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% gmake check VG=1
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</pre>
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</div>
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<p>To run individual tests or subsets of tests, you can use the 'llvm-lit'
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script which is built as part of LLVM. For example, to run the
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'Integer/BitCast.ll' test by itself you can run:</p>
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<div class="doc_code">
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<pre>
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% llvm-lit ~/llvm/test/Integer/BitCast.ll
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</pre>
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</div>
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<p>or to run all of the ARM CodeGen tests:</p>
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<div class="doc_code">
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<pre>
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% llvm-lit ~/llvm/test/CodeGen/ARM
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</pre>
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</div>
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<p>For more information on using the 'lit' tool, see 'llvm-lit --help' or the
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'lit' man page.</p>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsection"><a name="quicktestsuite">Test suite</a></div>
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<!-- _______________________________________________________________________ -->
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<p>To run the comprehensive test suite (tests that compile and execute whole
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programs), first checkout and setup the <tt>test-suite</tt> module:</p>
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<div class="doc_code">
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<pre>
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% cd llvm/projects
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% svn co http://llvm.org/svn/llvm-project/test-suite/trunk test-suite
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% cd ..
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% ./configure --with-llvmgccdir=$LLVM_GCC_DIR
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</pre>
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</div>
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<p>where <tt>$LLVM_GCC_DIR</tt> is the directory where
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you <em>installed</em> llvm-gcc, not its src or obj
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dir. The <tt>--with-llvmgccdir</tt> option assumes that
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the <tt>llvm-gcc-4.2</tt> module was configured with
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<tt>--program-prefix=llvm-</tt>, and therefore that the C and C++
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compiler drivers are called <tt>llvm-gcc</tt> and <tt>llvm-g++</tt>
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respectively. If this is not the case,
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use <tt>--with-llvmgcc</tt>/<tt>--with-llvmgxx</tt> to specify each
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executable's location.</p>
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<p>Then, run the entire test suite by running make in the <tt>test-suite</tt>
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directory:</p>
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<div class="doc_code">
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<pre>
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% cd projects/test-suite
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% gmake
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</pre>
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</div>
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<p>Usually, running the "nightly" set of tests is a good idea, and you can also
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let it generate a report by running:</p>
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<div class="doc_code">
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<pre>
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% cd projects/test-suite
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% gmake TEST=nightly report report.html
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</pre>
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</div>
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<p>Any of the above commands can also be run in a subdirectory of
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<tt>projects/test-suite</tt> to run the specified test only on the programs in
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that subdirectory.</p>
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsection"><a name="quickdebuginfotests">Debugging Information
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tests</a></div>
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<!-- _______________________________________________________________________ -->
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<p> To run debugging information tests simply checkout the tests inside
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clang/test directory. </p>
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<div class="doc_code">
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<pre>
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%cd clang/test
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% svn co http://llvm.org/svn/llvm-project/debuginfo-tests/trunk debuginfo-tests
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</pre>
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</div>
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<p> These tests are already set up to run as part of clang regression tests.</p>
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</div>
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<!--=========================================================================-->
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<div class="doc_section"><a name="rtstructure">Regression test structure</a></div>
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<!--=========================================================================-->
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<div class="doc_text">
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<p>The LLVM regression tests are driven by 'lit' and are located in
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the <tt>llvm/test</tt> directory.
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<p>This directory contains a large array of small tests
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that exercise various features of LLVM and to ensure that regressions do not
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occur. The directory is broken into several sub-directories, each focused on
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a particular area of LLVM. A few of the important ones are:</p>
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<ul>
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<li><tt>Analysis</tt>: checks Analysis passes.</li>
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<li><tt>Archive</tt>: checks the Archive library.</li>
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<li><tt>Assembler</tt>: checks Assembly reader/writer functionality.</li>
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<li><tt>Bitcode</tt>: checks Bitcode reader/writer functionality.</li>
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<li><tt>CodeGen</tt>: checks code generation and each target.</li>
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<li><tt>Features</tt>: checks various features of the LLVM language.</li>
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<li><tt>Linker</tt>: tests bitcode linking.</li>
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<li><tt>Transforms</tt>: tests each of the scalar, IPO, and utility
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transforms to ensure they make the right transformations.</li>
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<li><tt>Verifier</tt>: tests the IR verifier.</li>
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</ul>
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsection"><a name="rtcustom">Writing new regression tests</a></div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_text">
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<p>The regression test structure is very simple, but does require some
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information to be set. This information is gathered via <tt>configure</tt> and
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is written to a file, <tt>lit.site.cfg</tt>
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in <tt>llvm/test</tt>. The <tt>llvm/test</tt> Makefile does this work for
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you.</p>
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<p>In order for the regression tests to work, each directory of tests must
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have a <tt>dg.exp</tt> file. Lit looks for this file to determine how to
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run the tests. This file is just a Tcl script and it can do anything you want,
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but we've standardized it for the LLVM regression tests. If you're adding a
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directory of tests, just copy <tt>dg.exp</tt> from another directory to get
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running. The standard <tt>dg.exp</tt> simply loads a Tcl library
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(<tt>test/lib/llvm.exp</tt>) and calls the <tt>llvm_runtests</tt> function
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defined in that library with a list of file names to run. The names are
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obtained by using Tcl's glob command. Any directory that contains only
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directories does not need the <tt>dg.exp</tt> file.</p>
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<p>The <tt>llvm-runtests</tt> function lookas at each file that is passed to
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it and gathers any lines together that match "RUN:". This are the "RUN" lines
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that specify how the test is to be run. So, each test script must contain
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RUN lines if it is to do anything. If there are no RUN lines, the
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<tt>llvm-runtests</tt> function will issue an error and the test will
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fail.</p>
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<p>RUN lines are specified in the comments of the test program using the
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keyword <tt>RUN</tt> followed by a colon, and lastly the command (pipeline)
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to execute. Together, these lines form the "script" that
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<tt>llvm-runtests</tt> executes to run the test case. The syntax of the
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RUN lines is similar to a shell's syntax for pipelines including I/O
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redirection and variable substitution. However, even though these lines
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may <i>look</i> like a shell script, they are not. RUN lines are interpreted
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directly by the Tcl <tt>exec</tt> command. They are never executed by a
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shell. Consequently the syntax differs from normal shell script syntax in a
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few ways. You can specify as many RUN lines as needed.</p>
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<p>lit performs substitution on each RUN line to replace LLVM tool
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names with the full paths to the executable built for each tool (in
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$(LLVM_OBJ_ROOT)/$(BuildMode)/bin). This ensures that lit does not
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invoke any stray LLVM tools in the user's path during testing.</p>
|
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<p>Each RUN line is executed on its own, distinct from other lines unless
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its last character is <tt>\</tt>. This continuation character causes the RUN
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line to be concatenated with the next one. In this way you can build up long
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pipelines of commands without making huge line lengths. The lines ending in
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<tt>\</tt> are concatenated until a RUN line that doesn't end in <tt>\</tt> is
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found. This concatenated set of RUN lines then constitutes one execution.
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Tcl will substitute variables and arrange for the pipeline to be executed. If
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any process in the pipeline fails, the entire line (and test case) fails too.
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</p>
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<p> Below is an example of legal RUN lines in a <tt>.ll</tt> file:</p>
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<div class="doc_code">
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<pre>
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; RUN: llvm-as < %s | llvm-dis > %t1
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; RUN: llvm-dis < %s.bc-13 > %t2
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; RUN: diff %t1 %t2
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</pre>
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</div>
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<p>As with a Unix shell, the RUN: lines permit pipelines and I/O redirection
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to be used. However, the usage is slightly different than for Bash. To check
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what's legal, see the documentation for the
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<a href="http://www.tcl.tk/man/tcl8.5/TclCmd/exec.htm#M2">Tcl exec</a>
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command and the
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<a href="http://www.tcl.tk/man/tcl8.5/tutorial/Tcl26.html">tutorial</a>.
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|
The major differences are:</p>
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<ul>
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<li>You can't do <tt>2>&1</tt>. That will cause Tcl to write to a
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file named <tt>&1</tt>. Usually this is done to get stderr to go through
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|
a pipe. You can do that in tcl with <tt>|&</tt> so replace this idiom:
|
|
<tt>... 2>&1 | grep</tt> with <tt>... |& grep</tt></li>
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|
<li>You can only redirect to a file, not to another descriptor and not from
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|
a here document.</li>
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|
<li>tcl supports redirecting to open files with the @ syntax but you
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|
shouldn't use that here.</li>
|
|
</ul>
|
|
|
|
<p>There are some quoting rules that you must pay attention to when writing
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|
your RUN lines. In general nothing needs to be quoted. Tcl won't strip off any
|
|
quote characters so they will get passed to the invoked program. For
|
|
example:</p>
|
|
|
|
<div class="doc_code">
|
|
<pre>
|
|
... | grep 'find this string'
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</pre>
|
|
</div>
|
|
|
|
<p>This will fail because the ' characters are passed to grep. This would
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instruction grep to look for <tt>'find</tt> in the files <tt>this</tt> and
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<tt>string'</tt>. To avoid this use curly braces to tell Tcl that it should
|
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treat everything enclosed as one value. So our example would become:</p>
|
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|
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<div class="doc_code">
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<pre>
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... | grep {find this string}
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</pre>
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</div>
|
|
|
|
<p>Additionally, the characters <tt>[</tt> and <tt>]</tt> are treated
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specially by Tcl. They tell Tcl to interpret the content as a command to
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execute. Since these characters are often used in regular expressions this can
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have disastrous results and cause the entire test run in a directory to fail.
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|
For example, a common idiom is to look for some basicblock number:</p>
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<div class="doc_code">
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<pre>
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... | grep bb[2-8]
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</pre>
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</div>
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|
|
<p>This, however, will cause Tcl to fail because its going to try to execute
|
|
a program named "2-8". Instead, what you want is this:</p>
|
|
|
|
<div class="doc_code">
|
|
<pre>
|
|
... | grep {bb\[2-8\]}
|
|
</pre>
|
|
</div>
|
|
|
|
<p>Finally, if you need to pass the <tt>\</tt> character down to a program,
|
|
then it must be doubled. This is another Tcl special character. So, suppose
|
|
you had:
|
|
|
|
<div class="doc_code">
|
|
<pre>
|
|
... | grep 'i32\*'
|
|
</pre>
|
|
</div>
|
|
|
|
<p>This will fail to match what you want (a pointer to i32). First, the
|
|
<tt>'</tt> do not get stripped off. Second, the <tt>\</tt> gets stripped off
|
|
by Tcl so what grep sees is: <tt>'i32*'</tt>. That's not likely to match
|
|
anything. To resolve this you must use <tt>\\</tt> and the <tt>{}</tt>, like
|
|
this:</p>
|
|
|
|
<div class="doc_code">
|
|
<pre>
|
|
... | grep {i32\\*}
|
|
</pre>
|
|
</div>
|
|
|
|
<p>If your system includes GNU <tt>grep</tt>, make sure
|
|
that <tt>GREP_OPTIONS</tt> is not set in your environment. Otherwise,
|
|
you may get invalid results (both false positives and false
|
|
negatives).</p>
|
|
|
|
</div>
|
|
|
|
<!-- _______________________________________________________________________ -->
|
|
<div class="doc_subsection"><a name="FileCheck">The FileCheck utility</a></div>
|
|
<!-- _______________________________________________________________________ -->
|
|
|
|
<div class="doc_text">
|
|
|
|
<p>A powerful feature of the RUN: lines is that it allows any arbitrary commands
|
|
to be executed as part of the test harness. While standard (portable) unix
|
|
tools like 'grep' work fine on run lines, as you see above, there are a lot
|
|
of caveats due to interaction with Tcl syntax, and we want to make sure the
|
|
run lines are portable to a wide range of systems. Another major problem is
|
|
that grep is not very good at checking to verify that the output of a tools
|
|
contains a series of different output in a specific order. The FileCheck
|
|
tool was designed to help with these problems.</p>
|
|
|
|
<p>FileCheck (whose basic command line arguments are described in <a
|
|
href="http://llvm.org/cmds/FileCheck.html">the FileCheck man page</a> is
|
|
designed to read a file to check from standard input, and the set of things
|
|
to verify from a file specified as a command line argument. A simple example
|
|
of using FileCheck from a RUN line looks like this:</p>
|
|
|
|
<div class="doc_code">
|
|
<pre>
|
|
; RUN: llvm-as < %s | llc -march=x86-64 | <b>FileCheck %s</b>
|
|
</pre>
|
|
</div>
|
|
|
|
<p>This syntax says to pipe the current file ("%s") into llvm-as, pipe that into
|
|
llc, then pipe the output of llc into FileCheck. This means that FileCheck will
|
|
be verifying its standard input (the llc output) against the filename argument
|
|
specified (the original .ll file specified by "%s"). To see how this works,
|
|
lets look at the rest of the .ll file (after the RUN line):</p>
|
|
|
|
<div class="doc_code">
|
|
<pre>
|
|
define void @sub1(i32* %p, i32 %v) {
|
|
entry:
|
|
; <b>CHECK: sub1:</b>
|
|
; <b>CHECK: subl</b>
|
|
%0 = tail call i32 @llvm.atomic.load.sub.i32.p0i32(i32* %p, i32 %v)
|
|
ret void
|
|
}
|
|
|
|
define void @inc4(i64* %p) {
|
|
entry:
|
|
; <b>CHECK: inc4:</b>
|
|
; <b>CHECK: incq</b>
|
|
%0 = tail call i64 @llvm.atomic.load.add.i64.p0i64(i64* %p, i64 1)
|
|
ret void
|
|
}
|
|
</pre>
|
|
</div>
|
|
|
|
<p>Here you can see some "CHECK:" lines specified in comments. Now you can see
|
|
how the file is piped into llvm-as, then llc, and the machine code output is
|
|
what we are verifying. FileCheck checks the machine code output to verify that
|
|
it matches what the "CHECK:" lines specify.</p>
|
|
|
|
<p>The syntax of the CHECK: lines is very simple: they are fixed strings that
|
|
must occur in order. FileCheck defaults to ignoring horizontal whitespace
|
|
differences (e.g. a space is allowed to match a tab) but otherwise, the contents
|
|
of the CHECK: line is required to match some thing in the test file exactly.</p>
|
|
|
|
<p>One nice thing about FileCheck (compared to grep) is that it allows merging
|
|
test cases together into logical groups. For example, because the test above
|
|
is checking for the "sub1:" and "inc4:" labels, it will not match unless there
|
|
is a "subl" in between those labels. If it existed somewhere else in the file,
|
|
that would not count: "grep subl" matches if subl exists anywhere in the
|
|
file.</p>
|
|
|
|
</div>
|
|
|
|
<!-- _______________________________________________________________________ -->
|
|
<div class="doc_subsubsection"><a
|
|
name="FileCheck-check-prefix">The FileCheck -check-prefix option</a></div>
|
|
|
|
<div class="doc_text">
|
|
|
|
<p>The FileCheck -check-prefix option allows multiple test configurations to be
|
|
driven from one .ll file. This is useful in many circumstances, for example,
|
|
testing different architectural variants with llc. Here's a simple example:</p>
|
|
|
|
<div class="doc_code">
|
|
<pre>
|
|
; RUN: llvm-as < %s | llc -mtriple=i686-apple-darwin9 -mattr=sse41 \
|
|
; RUN: | <b>FileCheck %s -check-prefix=X32</b>
|
|
; RUN: llvm-as < %s | llc -mtriple=x86_64-apple-darwin9 -mattr=sse41 \
|
|
; RUN: | <b>FileCheck %s -check-prefix=X64</b>
|
|
|
|
define <4 x i32> @pinsrd_1(i32 %s, <4 x i32> %tmp) nounwind {
|
|
%tmp1 = insertelement <4 x i32> %tmp, i32 %s, i32 1
|
|
ret <4 x i32> %tmp1
|
|
; <b>X32:</b> pinsrd_1:
|
|
; <b>X32:</b> pinsrd $1, 4(%esp), %xmm0
|
|
|
|
; <b>X64:</b> pinsrd_1:
|
|
; <b>X64:</b> pinsrd $1, %edi, %xmm0
|
|
}
|
|
</pre>
|
|
</div>
|
|
|
|
<p>In this case, we're testing that we get the expected code generation with
|
|
both 32-bit and 64-bit code generation.</p>
|
|
|
|
</div>
|
|
|
|
<!-- _______________________________________________________________________ -->
|
|
<div class="doc_subsubsection"><a
|
|
name="FileCheck-CHECK-NEXT">The "CHECK-NEXT:" directive</a></div>
|
|
|
|
<div class="doc_text">
|
|
|
|
<p>Sometimes you want to match lines and would like to verify that matches
|
|
happen on exactly consecutive lines with no other lines in between them. In
|
|
this case, you can use CHECK: and CHECK-NEXT: directives to specify this. If
|
|
you specified a custom check prefix, just use "<PREFIX>-NEXT:". For
|
|
example, something like this works as you'd expect:</p>
|
|
|
|
<div class="doc_code">
|
|
<pre>
|
|
define void @t2(<2 x double>* %r, <2 x double>* %A, double %B) {
|
|
%tmp3 = load <2 x double>* %A, align 16
|
|
%tmp7 = insertelement <2 x double> undef, double %B, i32 0
|
|
%tmp9 = shufflevector <2 x double> %tmp3,
|
|
<2 x double> %tmp7,
|
|
<2 x i32> < i32 0, i32 2 >
|
|
store <2 x double> %tmp9, <2 x double>* %r, align 16
|
|
ret void
|
|
|
|
; <b>CHECK:</b> t2:
|
|
; <b>CHECK:</b> movl 8(%esp), %eax
|
|
; <b>CHECK-NEXT:</b> movapd (%eax), %xmm0
|
|
; <b>CHECK-NEXT:</b> movhpd 12(%esp), %xmm0
|
|
; <b>CHECK-NEXT:</b> movl 4(%esp), %eax
|
|
; <b>CHECK-NEXT:</b> movapd %xmm0, (%eax)
|
|
; <b>CHECK-NEXT:</b> ret
|
|
}
|
|
</pre>
|
|
</div>
|
|
|
|
<p>CHECK-NEXT: directives reject the input unless there is exactly one newline
|
|
between it an the previous directive. A CHECK-NEXT cannot be the first
|
|
directive in a file.</p>
|
|
|
|
</div>
|
|
|
|
<!-- _______________________________________________________________________ -->
|
|
<div class="doc_subsubsection"><a
|
|
name="FileCheck-CHECK-NOT">The "CHECK-NOT:" directive</a></div>
|
|
|
|
<div class="doc_text">
|
|
|
|
<p>The CHECK-NOT: directive is used to verify that a string doesn't occur
|
|
between two matches (or the first match and the beginning of the file). For
|
|
example, to verify that a load is removed by a transformation, a test like this
|
|
can be used:</p>
|
|
|
|
<div class="doc_code">
|
|
<pre>
|
|
define i8 @coerce_offset0(i32 %V, i32* %P) {
|
|
store i32 %V, i32* %P
|
|
|
|
%P2 = bitcast i32* %P to i8*
|
|
%P3 = getelementptr i8* %P2, i32 2
|
|
|
|
%A = load i8* %P3
|
|
ret i8 %A
|
|
; <b>CHECK:</b> @coerce_offset0
|
|
; <b>CHECK-NOT:</b> load
|
|
; <b>CHECK:</b> ret i8
|
|
}
|
|
</pre>
|
|
</div>
|
|
|
|
</div>
|
|
|
|
<!-- _______________________________________________________________________ -->
|
|
<div class="doc_subsubsection"><a
|
|
name="FileCheck-Matching">FileCheck Pattern Matching Syntax</a></div>
|
|
|
|
<div class="doc_text">
|
|
|
|
<p>The CHECK: and CHECK-NOT: directives both take a pattern to match. For most
|
|
uses of FileCheck, fixed string matching is perfectly sufficient. For some
|
|
things, a more flexible form of matching is desired. To support this, FileCheck
|
|
allows you to specify regular expressions in matching strings, surrounded by
|
|
double braces: <b>{{yourregex}}</b>. Because we want to use fixed string
|
|
matching for a majority of what we do, FileCheck has been designed to support
|
|
mixing and matching fixed string matching with regular expressions. This allows
|
|
you to write things like this:</p>
|
|
|
|
<div class="doc_code">
|
|
<pre>
|
|
; CHECK: movhpd <b>{{[0-9]+}}</b>(%esp), <b>{{%xmm[0-7]}}</b>
|
|
</pre>
|
|
</div>
|
|
|
|
<p>In this case, any offset from the ESP register will be allowed, and any xmm
|
|
register will be allowed.</p>
|
|
|
|
<p>Because regular expressions are enclosed with double braces, they are
|
|
visually distinct, and you don't need to use escape characters within the double
|
|
braces like you would in C. In the rare case that you want to match double
|
|
braces explicitly from the input, you can use something ugly like
|
|
<b>{{[{][{]}}</b> as your pattern.</p>
|
|
|
|
</div>
|
|
|
|
<!-- _______________________________________________________________________ -->
|
|
<div class="doc_subsubsection"><a
|
|
name="FileCheck-Variables">FileCheck Variables</a></div>
|
|
|
|
<div class="doc_text">
|
|
|
|
<p>It is often useful to match a pattern and then verify that it occurs again
|
|
later in the file. For codegen tests, this can be useful to allow any register,
|
|
but verify that that register is used consistently later. To do this, FileCheck
|
|
allows named variables to be defined and substituted into patterns. Here is a
|
|
simple example:</p>
|
|
|
|
<div class="doc_code">
|
|
<pre>
|
|
; CHECK: test5:
|
|
; CHECK: notw <b>[[REGISTER:%[a-z]+]]</b>
|
|
; CHECK: andw {{.*}}<b>[[REGISTER]]</b>
|
|
</pre>
|
|
</div>
|
|
|
|
<p>The first check line matches a regex (<tt>%[a-z]+</tt>) and captures it into
|
|
the variables "REGISTER". The second line verifies that whatever is in REGISTER
|
|
occurs later in the file after an "andw". FileCheck variable references are
|
|
always contained in <tt>[[ ]]</tt> pairs, are named, and their names can be
|
|
formed with the regex "<tt>[a-zA-Z][a-zA-Z0-9]*</tt>". If a colon follows the
|
|
name, then it is a definition of the variable, if not, it is a use.</p>
|
|
|
|
<p>FileCheck variables can be defined multiple times, and uses always get the
|
|
latest value. Note that variables are all read at the start of a "CHECK" line
|
|
and are all defined at the end. This means that if you have something like
|
|
"<tt>CHECK: [[XYZ:.*]]x[[XYZ]]</tt>" that the check line will read the previous
|
|
value of the XYZ variable and define a new one after the match is performed. If
|
|
you need to do something like this you can probably take advantage of the fact
|
|
that FileCheck is not actually line-oriented when it matches, this allows you to
|
|
define two separate CHECK lines that match on the same line.
|
|
</p>
|
|
|
|
</div>
|
|
|
|
<!-- _______________________________________________________________________ -->
|
|
<div class="doc_subsection"><a name="rtvars">Variables and
|
|
substitutions</a></div>
|
|
<!-- _______________________________________________________________________ -->
|
|
<div class="doc_text">
|
|
<p>With a RUN line there are a number of substitutions that are permitted. In
|
|
general, any Tcl variable that is available in the <tt>substitute</tt>
|
|
function (in <tt>test/lib/llvm.exp</tt>) can be substituted into a RUN line.
|
|
To make a substitution just write the variable's name preceded by a $.
|
|
Additionally, for compatibility reasons with previous versions of the test
|
|
library, certain names can be accessed with an alternate syntax: a % prefix.
|
|
These alternates are deprecated and may go away in a future version.
|
|
</p>
|
|
<p>Here are the available variable names. The alternate syntax is listed in
|
|
parentheses.</p>
|
|
|
|
<dl style="margin-left: 25px">
|
|
<dt><b>$test</b> (%s)</dt>
|
|
<dd>The full path to the test case's source. This is suitable for passing
|
|
on the command line as the input to an llvm tool.</dd>
|
|
|
|
<dt><b>$srcdir</b></dt>
|
|
<dd>The source directory from where the "<tt>make check</tt>" was run.</dd>
|
|
|
|
<dt><b>objdir</b></dt>
|
|
<dd>The object directory that corresponds to the <tt>$srcdir</tt>.</dd>
|
|
|
|
<dt><b>subdir</b></dt>
|
|
<dd>A partial path from the <tt>test</tt> directory that contains the
|
|
sub-directory that contains the test source being executed.</dd>
|
|
|
|
<dt><b>srcroot</b></dt>
|
|
<dd>The root directory of the LLVM src tree.</dd>
|
|
|
|
<dt><b>objroot</b></dt>
|
|
<dd>The root directory of the LLVM object tree. This could be the same
|
|
as the srcroot.</dd>
|
|
|
|
<dt><b>path</b><dt>
|
|
<dd>The path to the directory that contains the test case source. This is
|
|
for locating any supporting files that are not generated by the test, but
|
|
used by the test.</dd>
|
|
|
|
<dt><b>tmp</b></dt>
|
|
<dd>The path to a temporary file name that could be used for this test case.
|
|
The file name won't conflict with other test cases. You can append to it if
|
|
you need multiple temporaries. This is useful as the destination of some
|
|
redirected output.</dd>
|
|
|
|
<dt><b>llvmlibsdir</b> (%llvmlibsdir)</dt>
|
|
<dd>The directory where the LLVM libraries are located.</dd>
|
|
|
|
<dt><b>target_triplet</b> (%target_triplet)</dt>
|
|
<dd>The target triplet that corresponds to the current host machine (the one
|
|
running the test cases). This should probably be called "host".<dd>
|
|
|
|
<dt><b>llvmgcc</b> (%llvmgcc)</dt>
|
|
<dd>The full path to the <tt>llvm-gcc</tt> executable as specified in the
|
|
configured LLVM environment</dd>
|
|
|
|
<dt><b>llvmgxx</b> (%llvmgxx)</dt>
|
|
<dd>The full path to the <tt>llvm-gxx</tt> executable as specified in the
|
|
configured LLVM environment</dd>
|
|
|
|
<dt><b>gccpath</b></dt>
|
|
<dd>The full path to the C compiler used to <i>build </i> LLVM. Note that
|
|
this might not be gcc.</dd>
|
|
|
|
<dt><b>gxxpath</b></dt>
|
|
<dd>The full path to the C++ compiler used to <i>build </i> LLVM. Note that
|
|
this might not be g++.</dd>
|
|
|
|
<dt><b>compile_c</b> (%compile_c)</dt>
|
|
<dd>The full command line used to compile LLVM C source code. This has all
|
|
the configured -I, -D and optimization options.</dd>
|
|
|
|
<dt><b>compile_cxx</b> (%compile_cxx)</dt>
|
|
<dd>The full command used to compile LLVM C++ source code. This has
|
|
all the configured -I, -D and optimization options.</dd>
|
|
|
|
<dt><b>link</b> (%link)</dt>
|
|
<dd>This full link command used to link LLVM executables. This has all the
|
|
configured -I, -L and -l options.</dd>
|
|
|
|
<dt><b>shlibext</b> (%shlibext)</dt>
|
|
<dd>The suffix for the host platforms share library (dll) files. This
|
|
includes the period as the first character.</dd>
|
|
</dl>
|
|
<p>To add more variables, two things need to be changed. First, add a line in
|
|
the <tt>test/Makefile</tt> that creates the <tt>site.exp</tt> file. This will
|
|
"set" the variable as a global in the site.exp file. Second, in the
|
|
<tt>test/lib/llvm.exp</tt> file, in the substitute proc, add the variable name
|
|
to the list of "global" declarations at the beginning of the proc. That's it,
|
|
the variable can then be used in test scripts.</p>
|
|
</div>
|
|
|
|
<!-- _______________________________________________________________________ -->
|
|
<div class="doc_subsection"><a name="rtfeatures">Other Features</a></div>
|
|
<!-- _______________________________________________________________________ -->
|
|
<div class="doc_text">
|
|
<p>To make RUN line writing easier, there are several shell scripts located
|
|
in the <tt>llvm/test/Scripts</tt> directory. This directory is in the PATH
|
|
when running tests, so you can just call these scripts using their name. For
|
|
example:</p>
|
|
<dl>
|
|
<dt><b>ignore</b></dt>
|
|
<dd>This script runs its arguments and then always returns 0. This is useful
|
|
in cases where the test needs to cause a tool to generate an error (e.g. to
|
|
check the error output). However, any program in a pipeline that returns a
|
|
non-zero result will cause the test to fail. This script overcomes that
|
|
issue and nicely documents that the test case is purposefully ignoring the
|
|
result code of the tool</dd>
|
|
|
|
<dt><b>not</b></dt>
|
|
<dd>This script runs its arguments and then inverts the result code from
|
|
it. Zero result codes become 1. Non-zero result codes become 0. This is
|
|
useful to invert the result of a grep. For example "not grep X" means
|
|
succeed only if you don't find X in the input.</dd>
|
|
</dl>
|
|
|
|
<p>Sometimes it is necessary to mark a test case as "expected fail" or XFAIL.
|
|
You can easily mark a test as XFAIL just by including <tt>XFAIL: </tt> on a
|
|
line near the top of the file. This signals that the test case should succeed
|
|
if the test fails. Such test cases are counted separately by the testing tool. To
|
|
specify an expected fail, use the XFAIL keyword in the comments of the test
|
|
program followed by a colon and one or more regular expressions (separated by
|
|
a comma). The regular expressions allow you to XFAIL the test conditionally by
|
|
host platform. The regular expressions following the : are matched against the
|
|
target triplet for the host machine. If there is a match, the test is expected
|
|
to fail. If not, the test is expected to succeed. To XFAIL everywhere just
|
|
specify <tt>XFAIL: *</tt>. Here is an example of an <tt>XFAIL</tt> line:</p>
|
|
|
|
<div class="doc_code">
|
|
<pre>
|
|
; XFAIL: darwin,sun
|
|
</pre>
|
|
</div>
|
|
|
|
<p>To make the output more useful, the <tt>llvm_runtest</tt> function wil
|
|
scan the lines of the test case for ones that contain a pattern that matches
|
|
PR[0-9]+. This is the syntax for specifying a PR (Problem Report) number that
|
|
is related to the test case. The number after "PR" specifies the LLVM bugzilla
|
|
number. When a PR number is specified, it will be used in the pass/fail
|
|
reporting. This is useful to quickly get some context when a test fails.</p>
|
|
|
|
<p>Finally, any line that contains "END." will cause the special
|
|
interpretation of lines to terminate. This is generally done right after the
|
|
last RUN: line. This has two side effects: (a) it prevents special
|
|
interpretation of lines that are part of the test program, not the
|
|
instructions to the test case, and (b) it speeds things up for really big test
|
|
cases by avoiding interpretation of the remainder of the file.</p>
|
|
|
|
</div>
|
|
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<!--=========================================================================-->
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<div class="doc_section"><a name="testsuitestructure">Test suite
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Structure</a></div>
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<!--=========================================================================-->
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<div class="doc_text">
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<p>The <tt>test-suite</tt> module contains a number of programs that can be compiled
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with LLVM and executed. These programs are compiled using the native compiler
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and various LLVM backends. The output from the program compiled with the
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native compiler is assumed correct; the results from the other programs are
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compared to the native program output and pass if they match.</p>
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<p>When executing tests, it is usually a good idea to start out with a subset of
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the available tests or programs. This makes test run times smaller at first and
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later on this is useful to investigate individual test failures. To run some
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test only on a subset of programs, simply change directory to the programs you
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want tested and run <tt>gmake</tt> there. Alternatively, you can run a different
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test using the <tt>TEST</tt> variable to change what tests or run on the
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selected programs (see below for more info).</p>
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<p>In addition for testing correctness, the <tt>test-suite</tt> directory also
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performs timing tests of various LLVM optimizations. It also records
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compilation times for the compilers and the JIT. This information can be
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used to compare the effectiveness of LLVM's optimizations and code
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generation.</p>
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<p><tt>test-suite</tt> tests are divided into three types of tests: MultiSource,
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SingleSource, and External.</p>
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<ul>
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<li><tt>test-suite/SingleSource</tt>
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<p>The SingleSource directory contains test programs that are only a single
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source file in size. These are usually small benchmark programs or small
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programs that calculate a particular value. Several such programs are grouped
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together in each directory.</p></li>
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<li><tt>test-suite/MultiSource</tt>
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<p>The MultiSource directory contains subdirectories which contain entire
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programs with multiple source files. Large benchmarks and whole applications
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go here.</p></li>
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<li><tt>test-suite/External</tt>
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<p>The External directory contains Makefiles for building code that is external
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to (i.e., not distributed with) LLVM. The most prominent members of this
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directory are the SPEC 95 and SPEC 2000 benchmark suites. The <tt>External</tt>
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directory does not contain these actual tests, but only the Makefiles that know
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how to properly compile these programs from somewhere else. The presence and
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location of these external programs is configured by the test-suite
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<tt>configure</tt> script.</p></li>
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</ul>
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<p>Each tree is then subdivided into several categories, including applications,
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benchmarks, regression tests, code that is strange grammatically, etc. These
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organizations should be relatively self explanatory.</p>
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<p>Some tests are known to fail. Some are bugs that we have not fixed yet;
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others are features that we haven't added yet (or may never add). In the
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regression tests, the result for such tests will be XFAIL (eXpected FAILure).
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In this way, you can tell the difference between an expected and unexpected
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failure.</p>
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<p>The tests in the test suite have no such feature at this time. If the
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test passes, only warnings and other miscellaneous output will be generated. If
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a test fails, a large <program> FAILED message will be displayed. This
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will help you separate benign warnings from actual test failures.</p>
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</div>
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<!--=========================================================================-->
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<div class="doc_section"><a name="testsuiterun">Running the test suite</a></div>
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<!--=========================================================================-->
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<div class="doc_text">
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<p>First, all tests are executed within the LLVM object directory tree. They
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<i>are not</i> executed inside of the LLVM source tree. This is because the
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test suite creates temporary files during execution.</p>
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<p>To run the test suite, you need to use the following steps:</p>
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<ol>
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<li><tt>cd</tt> into the <tt>llvm/projects</tt> directory in your source tree.
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</li>
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<li><p>Check out the <tt>test-suite</tt> module with:</p>
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<div class="doc_code">
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<pre>
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% svn co http://llvm.org/svn/llvm-project/test-suite/trunk test-suite
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</pre>
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</div>
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<p>This will get the test suite into <tt>llvm/projects/test-suite</tt>.</p>
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</li>
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<li><p>Configure and build <tt>llvm</tt>.</p></li>
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<li><p>Configure and build <tt>llvm-gcc</tt>.</p></li>
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<li><p>Install <tt>llvm-gcc</tt> somewhere.</p></li>
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<li><p><em>Re-configure</em> <tt>llvm</tt> from the top level of
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each build tree (LLVM object directory tree) in which you want
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to run the test suite, just as you do before building LLVM.</p>
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<p>During the <em>re-configuration</em>, you must either: (1)
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have <tt>llvm-gcc</tt> you just built in your path, or (2)
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specify the directory where your just-built <tt>llvm-gcc</tt> is
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installed using <tt>--with-llvmgccdir=$LLVM_GCC_DIR</tt>.</p>
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<p>You must also tell the configure machinery that the test suite
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is available so it can be configured for your build tree:</p>
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<div class="doc_code">
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<pre>
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% cd $LLVM_OBJ_ROOT ; $LLVM_SRC_ROOT/configure [--with-llvmgccdir=$LLVM_GCC_DIR]
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</pre>
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</div>
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<p>[Remember that <tt>$LLVM_GCC_DIR</tt> is the directory where you
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<em>installed</em> llvm-gcc, not its src or obj directory.]</p>
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</li>
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<li><p>You can now run the test suite from your build tree as follows:</p>
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<div class="doc_code">
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<pre>
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% cd $LLVM_OBJ_ROOT/projects/test-suite
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% make
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</pre>
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</div>
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</li>
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</ol>
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<p>Note that the second and third steps only need to be done once. After you
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have the suite checked out and configured, you don't need to do it again (unless
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the test code or configure script changes).</p>
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsection">
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<a name="testsuiteexternal">Configuring External Tests</a></div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_text">
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<p>In order to run the External tests in the <tt>test-suite</tt>
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module, you must specify <i>--with-externals</i>. This
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must be done during the <em>re-configuration</em> step (see above),
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and the <tt>llvm</tt> re-configuration must recognize the
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previously-built <tt>llvm-gcc</tt>. If any of these is missing or
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neglected, the External tests won't work.</p>
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<dl>
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<dt><i>--with-externals</i></dt>
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<dt><i>--with-externals=<<tt>directory</tt>></i></dt>
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</dl>
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This tells LLVM where to find any external tests. They are expected to be
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in specifically named subdirectories of <<tt>directory</tt>>.
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If <tt>directory</tt> is left unspecified,
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<tt>configure</tt> uses the default value
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<tt>/home/vadve/shared/benchmarks/speccpu2000/benchspec</tt>.
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Subdirectory names known to LLVM include:
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<dl>
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<dt>spec95</dt>
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<dt>speccpu2000</dt>
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<dt>speccpu2006</dt>
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<dt>povray31</dt>
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</dl>
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Others are added from time to time, and can be determined from
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<tt>configure</tt>.
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsection">
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<a name="testsuitetests">Running different tests</a></div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_text">
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<p>In addition to the regular "whole program" tests, the <tt>test-suite</tt>
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module also provides a mechanism for compiling the programs in different ways.
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If the variable TEST is defined on the <tt>gmake</tt> command line, the test system will
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include a Makefile named <tt>TEST.<value of TEST variable>.Makefile</tt>.
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This Makefile can modify build rules to yield different results.</p>
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<p>For example, the LLVM nightly tester uses <tt>TEST.nightly.Makefile</tt> to
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create the nightly test reports. To run the nightly tests, run <tt>gmake
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TEST=nightly</tt>.</p>
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<p>There are several TEST Makefiles available in the tree. Some of them are
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designed for internal LLVM research and will not work outside of the LLVM
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research group. They may still be valuable, however, as a guide to writing your
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own TEST Makefile for any optimization or analysis passes that you develop with
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LLVM.</p>
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</div>
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|
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsection">
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<a name="testsuiteoutput">Generating test output</a></div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_text">
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<p>There are a number of ways to run the tests and generate output. The most
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simple one is simply running <tt>gmake</tt> with no arguments. This will
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compile and run all programs in the tree using a number of different methods
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and compare results. Any failures are reported in the output, but are likely
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drowned in the other output. Passes are not reported explicitely.</p>
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<p>Somewhat better is running <tt>gmake TEST=sometest test</tt>, which runs
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the specified test and usually adds per-program summaries to the output
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(depending on which sometest you use). For example, the <tt>nightly</tt> test
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explicitely outputs TEST-PASS or TEST-FAIL for every test after each program.
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Though these lines are still drowned in the output, it's easy to grep the
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output logs in the Output directories.</p>
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<p>Even better are the <tt>report</tt> and <tt>report.format</tt> targets
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(where <tt>format</tt> is one of <tt>html</tt>, <tt>csv</tt>, <tt>text</tt> or
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<tt>graphs</tt>). The exact contents of the report are dependent on which
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<tt>TEST</tt> you are running, but the text results are always shown at the
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end of the run and the results are always stored in the
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<tt>report.<type>.format</tt> file (when running with
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<tt>TEST=<type></tt>).
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The <tt>report</tt> also generate a file called
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<tt>report.<type>.raw.out</tt> containing the output of the entire test
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run.
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsection">
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<a name="testsuitecustom">Writing custom tests for the test suite</a></div>
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<!-- _______________________________________________________________________ -->
|
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<div class="doc_text">
|
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<p>Assuming you can run the test suite, (e.g. "<tt>gmake TEST=nightly report</tt>"
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should work), it is really easy to run optimizations or code generator
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components against every program in the tree, collecting statistics or running
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custom checks for correctness. At base, this is how the nightly tester works,
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it's just one example of a general framework.</p>
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<p>Lets say that you have an LLVM optimization pass, and you want to see how
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many times it triggers. First thing you should do is add an LLVM
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<a href="ProgrammersManual.html#Statistic">statistic</a> to your pass, which
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will tally counts of things you care about.</p>
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<p>Following this, you can set up a test and a report that collects these and
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formats them for easy viewing. This consists of two files, a
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"<tt>test-suite/TEST.XXX.Makefile</tt>" fragment (where XXX is the name of your
|
|
test) and a "<tt>test-suite/TEST.XXX.report</tt>" file that indicates how to
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format the output into a table. There are many example reports of various
|
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levels of sophistication included with the test suite, and the framework is very
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general.</p>
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<p>If you are interested in testing an optimization pass, check out the
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"libcalls" test as an example. It can be run like this:<p>
|
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|
|
<div class="doc_code">
|
|
<pre>
|
|
% cd llvm/projects/test-suite/MultiSource/Benchmarks # or some other level
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% make TEST=libcalls report
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</pre>
|
|
</div>
|
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<p>This will do a bunch of stuff, then eventually print a table like this:</p>
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<div class="doc_code">
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<pre>
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Name | total | #exit |
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...
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FreeBench/analyzer/analyzer | 51 | 6 |
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FreeBench/fourinarow/fourinarow | 1 | 1 |
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FreeBench/neural/neural | 19 | 9 |
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FreeBench/pifft/pifft | 5 | 3 |
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MallocBench/cfrac/cfrac | 1 | * |
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MallocBench/espresso/espresso | 52 | 12 |
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MallocBench/gs/gs | 4 | * |
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Prolangs-C/TimberWolfMC/timberwolfmc | 302 | * |
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Prolangs-C/agrep/agrep | 33 | 12 |
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Prolangs-C/allroots/allroots | * | * |
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Prolangs-C/assembler/assembler | 47 | * |
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Prolangs-C/bison/mybison | 74 | * |
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...
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</pre>
|
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</div>
|
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|
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<p>This basically is grepping the -stats output and displaying it in a table.
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You can also use the "TEST=libcalls report.html" target to get the table in HTML
|
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form, similarly for report.csv and report.tex.</p>
|
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<p>The source for this is in test-suite/TEST.libcalls.*. The format is pretty
|
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simple: the Makefile indicates how to run the test (in this case,
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"<tt>opt -simplify-libcalls -stats</tt>"), and the report contains one line for
|
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each column of the output. The first value is the header for the column and the
|
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second is the regex to grep the output of the command for. There are lots of
|
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example reports that can do fancy stuff.</p>
|
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|
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</div>
|
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<!-- *********************************************************************** -->
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John T. Criswell, Daniel Dunbar, Reid Spencer, and Tanya Lattner<br>
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<a href="http://llvm.org">The LLVM Compiler Infrastructure</a><br>
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Last modified: $Date$
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