third_party/llvm-7.0/llvm/docs/TestSuiteMakefileGuide.rst - SwiftShader - Git at Google

 =====================
 LLVM test-suite Guide
 =====================

 .. contents::
    :local:

 Overview
 ========

 This document describes the features of the Makefile-based LLVM
 test-suite as well as the cmake based replacement. This way of interacting
 with the test-suite is deprecated in favor of running the test-suite using LNT,
 but may continue to prove useful for some users. See the Testing
 Guide's :ref:`test-suite Quickstart <test-suite-quickstart>` section for more
 information.

 Test suite Structure
 ====================

 The ``test-suite`` module contains a number of programs that can be
 compiled with LLVM and executed. These programs are compiled using the
 native compiler and various LLVM backends. The output from the program
 compiled with the native compiler is assumed correct; the results from
 the other programs are compared to the native program output and pass if
 they match.

 When executing tests, it is usually a good idea to start out with a
 subset of the available tests or programs. This makes test run times
 smaller at first and later on this is useful to investigate individual
 test failures. To run some test only on a subset of programs, simply
 change directory to the programs you want tested and run ``gmake``
 there. Alternatively, you can run a different test using the ``TEST``
 variable to change what tests or run on the selected programs (see below
 for more info).

 In addition for testing correctness, the ``test-suite`` directory also
 performs timing tests of various LLVM optimizations. It also records
 compilation times for the compilers and the JIT. This information can be
 used to compare the effectiveness of LLVM's optimizations and code
 generation.

 ``test-suite`` tests are divided into three types of tests: MultiSource,
 SingleSource, and External.

 -  ``test-suite/SingleSource``

    The SingleSource directory contains test programs that are only a
    single source file in size. These are usually small benchmark
    programs or small programs that calculate a particular value. Several
    such programs are grouped together in each directory.

 -  ``test-suite/MultiSource``

    The MultiSource directory contains subdirectories which contain
    entire programs with multiple source files. Large benchmarks and
    whole applications go here.

 -  ``test-suite/External``

    The External directory contains Makefiles for building code that is
    external to (i.e., not distributed with) LLVM. The most prominent
    members of this directory are the SPEC 95 and SPEC 2000 benchmark
    suites. The ``External`` directory does not contain these actual
    tests, but only the Makefiles that know how to properly compile these
    programs from somewhere else. The presence and location of these
    external programs is configured by the test-suite ``configure``
    script.

 Each tree is then subdivided into several categories, including
 applications, benchmarks, regression tests, code that is strange
 grammatically, etc. These organizations should be relatively self
 explanatory.

 Some tests are known to fail. Some are bugs that we have not fixed yet;
 others are features that we haven't added yet (or may never add). In the
 regression tests, the result for such tests will be XFAIL (eXpected
 FAILure). In this way, you can tell the difference between an expected
 and unexpected failure.

 The tests in the test suite have no such feature at this time. If the
 test passes, only warnings and other miscellaneous output will be
 generated. If a test fails, a large <program> FAILED message will be
 displayed. This will help you separate benign warnings from actual test
 failures.

 Running the test suite via CMake
 ================================

 To run the test suite, you need to use the following steps:

 #. The test suite uses the lit test runner to run the test-suite,
    you need to have lit installed first.  Check out LLVM and install lit:

    .. code-block:: bash

        % svn co http://llvm.org/svn/llvm-project/llvm/trunk llvm
        % cd llvm/utils/lit
        % sudo python setup.py install # Or without sudo, install in virtual-env.
        running install
        running bdist_egg
        running egg_info
        writing lit.egg-info/PKG-INFO
        ...
        % lit --version
        lit 0.5.0dev

 #. Check out the ``test-suite`` module with:

    .. code-block:: bash

        % svn co http://llvm.org/svn/llvm-project/test-suite/trunk test-suite

 #. Use CMake to configure the test suite in a new directory. You cannot build
    the test suite in the source tree.

    .. code-block:: bash

        % mkdir test-suite-build
        % cd test-suite-build
        % cmake ../test-suite

 #. Build the benchmarks, using the makefiles CMake generated.

 .. code-block:: bash

     % make
     Scanning dependencies of target timeit-target
     [  0%] Building C object tools/CMakeFiles/timeit-target.dir/timeit.c.o
     [  0%] Linking C executable timeit-target
     [  0%] Built target timeit-target
     Scanning dependencies of target fpcmp-host
     [  0%] [TEST_SUITE_HOST_CC] Building host executable fpcmp
     [  0%] Built target fpcmp-host
     Scanning dependencies of target timeit-host
     [  0%] [TEST_SUITE_HOST_CC] Building host executable timeit
     [  0%] Built target timeit-host


 #. Run the tests with lit:

 .. code-block:: bash

     % lit -v -j 1 . -o results.json
     -- Testing: 474 tests, 1 threads --
     PASS: test-suite :: MultiSource/Applications/ALAC/decode/alacconvert-decode.test (1 of 474)
     ********** TEST 'test-suite :: MultiSource/Applications/ALAC/decode/alacconvert-decode.test' RESULTS **********
     compile_time: 0.2192
     exec_time: 0.0462
     hash: "59620e187c6ac38b36382685ccd2b63b"
     size: 83348
     **********
     PASS: test-suite :: MultiSource/Applications/ALAC/encode/alacconvert-encode.test (2 of 474)


 Running the test suite via Makefiles (deprecated)
 =================================================

 First, all tests are executed within the LLVM object directory tree.
 They *are not* executed inside of the LLVM source tree. This is because
 the test suite creates temporary files during execution.

 To run the test suite, you need to use the following steps:

 #. ``cd`` into the ``llvm/projects`` directory in your source tree.
 #. Check out the ``test-suite`` module with:

    .. code-block:: bash

        % svn co http://llvm.org/svn/llvm-project/test-suite/trunk test-suite

    This will get the test suite into ``llvm/projects/test-suite``.

 #. Configure and build ``llvm``.

 #. Configure and build ``llvm-gcc``.

 #. Install ``llvm-gcc`` somewhere.

 #. *Re-configure* ``llvm`` from the top level of each build tree (LLVM
    object directory tree) in which you want to run the test suite, just
    as you do before building LLVM.

    During the *re-configuration*, you must either: (1) have ``llvm-gcc``
    you just built in your path, or (2) specify the directory where your
    just-built ``llvm-gcc`` is installed using
    ``--with-llvmgccdir=$LLVM_GCC_DIR``.

    You must also tell the configure machinery that the test suite is
    available so it can be configured for your build tree:

    .. code-block:: bash

        % cd $LLVM_OBJ_ROOT ; $LLVM_SRC_ROOT/configure [--with-llvmgccdir=$LLVM_GCC_DIR]

    [Remember that ``$LLVM_GCC_DIR`` is the directory where you
    *installed* llvm-gcc, not its src or obj directory.]

 #. You can now run the test suite from your build tree as follows:

    .. code-block:: bash

        % cd $LLVM_OBJ_ROOT/projects/test-suite
        % make

 Note that the second and third steps only need to be done once. After
 you have the suite checked out and configured, you don't need to do it
 again (unless the test code or configure script changes).

 Configuring External Tests
 --------------------------

 In order to run the External tests in the ``test-suite`` module, you
 must specify *--with-externals*. This must be done during the
 *re-configuration* step (see above), and the ``llvm`` re-configuration
 must recognize the previously-built ``llvm-gcc``. If any of these is
 missing or neglected, the External tests won't work.

 * *--with-externals*

 * *--with-externals=<directory>*

 This tells LLVM where to find any external tests. They are expected to
 be in specifically named subdirectories of <``directory``>. If
 ``directory`` is left unspecified, ``configure`` uses the default value
 ``/home/vadve/shared/benchmarks/speccpu2000/benchspec``. Subdirectory
 names known to LLVM include:

 * spec95

 * speccpu2000

 * speccpu2006

 * povray31

 Others are added from time to time, and can be determined from
 ``configure``.

 Running different tests
 -----------------------

 In addition to the regular "whole program" tests, the ``test-suite``
 module also provides a mechanism for compiling the programs in different
 ways. If the variable TEST is defined on the ``gmake`` command line, the
 test system will include a Makefile named
 ``TEST.<value of TEST variable>.Makefile``. This Makefile can modify
 build rules to yield different results.

 For example, the LLVM nightly tester uses ``TEST.nightly.Makefile`` to
 create the nightly test reports. To run the nightly tests, run
 ``gmake TEST=nightly``.

 There are several TEST Makefiles available in the tree. Some of them are
 designed for internal LLVM research and will not work outside of the
 LLVM research group. They may still be valuable, however, as a guide to
 writing your own TEST Makefile for any optimization or analysis passes
 that you develop with LLVM.

 Generating test output
 ----------------------

 There are a number of ways to run the tests and generate output. The
 most simple one is simply running ``gmake`` with no arguments. This will
 compile and run all programs in the tree using a number of different
 methods and compare results. Any failures are reported in the output,
 but are likely drowned in the other output. Passes are not reported
 explicitly.

 Somewhat better is running ``gmake TEST=sometest test``, which runs the
 specified test and usually adds per-program summaries to the output
 (depending on which sometest you use). For example, the ``nightly`` test
 explicitly outputs TEST-PASS or TEST-FAIL for every test after each
 program. Though these lines are still drowned in the output, it's easy
 to grep the output logs in the Output directories.

 Even better are the ``report`` and ``report.format`` targets (where
 ``format`` is one of ``html``, ``csv``, ``text`` or ``graphs``). The
 exact contents of the report are dependent on which ``TEST`` you are
 running, but the text results are always shown at the end of the run and
 the results are always stored in the ``report.<type>.format`` file (when
 running with ``TEST=<type>``). The ``report`` also generate a file
 called ``report.<type>.raw.out`` containing the output of the entire
 test run.

 Writing custom tests for the test suite
 ---------------------------------------

 Assuming you can run the test suite, (e.g.
 "``gmake TEST=nightly report``" should work), it is really easy to run
 optimizations or code generator components against every program in the
 tree, collecting statistics or running custom checks for correctness. At
 base, this is how the nightly tester works, it's just one example of a
 general framework.

 Lets say that you have an LLVM optimization pass, and you want to see
 how many times it triggers. First thing you should do is add an LLVM
 `statistic <ProgrammersManual.html#Statistic>`_ to your pass, which will
 tally counts of things you care about.

 Following this, you can set up a test and a report that collects these
 and formats them for easy viewing. This consists of two files, a
 "``test-suite/TEST.XXX.Makefile``" fragment (where XXX is the name of
 your test) and a "``test-suite/TEST.XXX.report``" file that indicates
 how to format the output into a table. There are many example reports of
 various levels of sophistication included with the test suite, and the
 framework is very general.

 If you are interested in testing an optimization pass, check out the
 "libcalls" test as an example. It can be run like this:

 .. code-block:: bash

     % cd llvm/projects/test-suite/MultiSource/Benchmarks  # or some other level
     % make TEST=libcalls report

 This will do a bunch of stuff, then eventually print a table like this:

 ::

     Name                                  | total | #exit |
     ...
     FreeBench/analyzer/analyzer           | 51    | 6     |
     FreeBench/fourinarow/fourinarow       | 1     | 1     |
     FreeBench/neural/neural               | 19    | 9     |
     FreeBench/pifft/pifft                 | 5     | 3     |
     MallocBench/cfrac/cfrac               | 1     | *     |
     MallocBench/espresso/espresso         | 52    | 12    |
     MallocBench/gs/gs                     | 4     | *     |
     Prolangs-C/TimberWolfMC/timberwolfmc  | 302   | *     |
     Prolangs-C/agrep/agrep                | 33    | 12    |
     Prolangs-C/allroots/allroots          | *     | *     |
     Prolangs-C/assembler/assembler        | 47    | *     |
     Prolangs-C/bison/mybison              | 74    | *     |
     ...

 This basically is grepping the -stats output and displaying it in a
 table. You can also use the "TEST=libcalls report.html" target to get
 the table in HTML form, similarly for report.csv and report.tex.

 The source for this is in ``test-suite/TEST.libcalls.*``. The format is
 pretty simple: the Makefile indicates how to run the test (in this case,
 "``opt -simplify-libcalls -stats``"), and the report contains one line
 for each column of the output. The first value is the header for the
 column and the second is the regex to grep the output of the command
 for. There are lots of example reports that can do fancy stuff.
	=====================
	LLVM test-suite Guide
	=====================

	.. contents::
	:local:

	Overview
	========

	This document describes the features of the Makefile-based LLVM
	test-suite as well as the cmake based replacement. This way of interacting
	with the test-suite is deprecated in favor of running the test-suite using LNT,
	but may continue to prove useful for some users. See the Testing
	Guide's :ref:`test-suite Quickstart <test-suite-quickstart>` section for more
	information.

	Test suite Structure
	====================

	The ``test-suite`` module contains a number of programs that can be
	compiled with LLVM and executed. These programs are compiled using the
	native compiler and various LLVM backends. The output from the program
	compiled with the native compiler is assumed correct; the results from
	the other programs are compared to the native program output and pass if
	they match.

	When executing tests, it is usually a good idea to start out with a
	subset of the available tests or programs. This makes test run times
	smaller at first and later on this is useful to investigate individual
	test failures. To run some test only on a subset of programs, simply
	change directory to the programs you want tested and run ``gmake``
	there. Alternatively, you can run a different test using the ``TEST``
	variable to change what tests or run on the selected programs (see below
	for more info).

	In addition for testing correctness, the ``test-suite`` directory also
	performs timing tests of various LLVM optimizations. It also records
	compilation times for the compilers and the JIT. This information can be
	used to compare the effectiveness of LLVM's optimizations and code
	generation.

	``test-suite`` tests are divided into three types of tests: MultiSource,
	SingleSource, and External.

	- ``test-suite/SingleSource``

	The SingleSource directory contains test programs that are only a
	single source file in size. These are usually small benchmark
	programs or small programs that calculate a particular value. Several
	such programs are grouped together in each directory.

	- ``test-suite/MultiSource``

	The MultiSource directory contains subdirectories which contain
	entire programs with multiple source files. Large benchmarks and
	whole applications go here.

	- ``test-suite/External``

	The External directory contains Makefiles for building code that is
	external to (i.e., not distributed with) LLVM. The most prominent
	members of this directory are the SPEC 95 and SPEC 2000 benchmark
	suites. The ``External`` directory does not contain these actual
	tests, but only the Makefiles that know how to properly compile these
	programs from somewhere else. The presence and location of these
	external programs is configured by the test-suite ``configure``
	script.

	Each tree is then subdivided into several categories, including
	applications, benchmarks, regression tests, code that is strange
	grammatically, etc. These organizations should be relatively self
	explanatory.

	Some tests are known to fail. Some are bugs that we have not fixed yet;
	others are features that we haven't added yet (or may never add). In the
	regression tests, the result for such tests will be XFAIL (eXpected
	FAILure). In this way, you can tell the difference between an expected
	and unexpected failure.

	The tests in the test suite have no such feature at this time. If the
	test passes, only warnings and other miscellaneous output will be
	generated. If a test fails, a large <program> FAILED message will be
	displayed. This will help you separate benign warnings from actual test
	failures.

	Running the test suite via CMake
	================================

	To run the test suite, you need to use the following steps:

	#. The test suite uses the lit test runner to run the test-suite,
	you need to have lit installed first. Check out LLVM and install lit:

	.. code-block:: bash

	% svn co http://llvm.org/svn/llvm-project/llvm/trunk llvm
	% cd llvm/utils/lit
	% sudo python setup.py install # Or without sudo, install in virtual-env.
	running install
	running bdist_egg
	running egg_info
	writing lit.egg-info/PKG-INFO
	...
	% lit --version
	lit 0.5.0dev

	#. Check out the ``test-suite`` module with:

	.. code-block:: bash

	% svn co http://llvm.org/svn/llvm-project/test-suite/trunk test-suite

	#. Use CMake to configure the test suite in a new directory. You cannot build
	the test suite in the source tree.

	.. code-block:: bash

	% mkdir test-suite-build
	% cd test-suite-build
	% cmake ../test-suite

	#. Build the benchmarks, using the makefiles CMake generated.

	.. code-block:: bash

	% make
	Scanning dependencies of target timeit-target
	[ 0%] Building C object tools/CMakeFiles/timeit-target.dir/timeit.c.o
	[ 0%] Linking C executable timeit-target
	[ 0%] Built target timeit-target
	Scanning dependencies of target fpcmp-host
	[ 0%] [TEST_SUITE_HOST_CC] Building host executable fpcmp
	[ 0%] Built target fpcmp-host
	Scanning dependencies of target timeit-host
	[ 0%] [TEST_SUITE_HOST_CC] Building host executable timeit
	[ 0%] Built target timeit-host


	#. Run the tests with lit:

	.. code-block:: bash

	% lit -v -j 1 . -o results.json
	-- Testing: 474 tests, 1 threads --
	PASS: test-suite :: MultiSource/Applications/ALAC/decode/alacconvert-decode.test (1 of 474)
	******** TEST 'test-suite :: MultiSource/Applications/ALAC/decode/alacconvert-decode.test' RESULTS ********
	compile_time: 0.2192
	exec_time: 0.0462
	hash: "59620e187c6ac38b36382685ccd2b63b"
	size: 83348
	**********
	PASS: test-suite :: MultiSource/Applications/ALAC/encode/alacconvert-encode.test (2 of 474)


	Running the test suite via Makefiles (deprecated)
	=================================================

	First, all tests are executed within the LLVM object directory tree.
	They are not executed inside of the LLVM source tree. This is because
	the test suite creates temporary files during execution.

	To run the test suite, you need to use the following steps:

	#. ``cd`` into the ``llvm/projects`` directory in your source tree.
	#. Check out the ``test-suite`` module with:

	.. code-block:: bash

	% svn co http://llvm.org/svn/llvm-project/test-suite/trunk test-suite

	This will get the test suite into ``llvm/projects/test-suite``.

	#. Configure and build ``llvm``.

	#. Configure and build ``llvm-gcc``.

	#. Install ``llvm-gcc`` somewhere.

	#. Re-configure ``llvm`` from the top level of each build tree (LLVM
	object directory tree) in which you want to run the test suite, just
	as you do before building LLVM.

	During the re-configuration, you must either: (1) have ``llvm-gcc``
	you just built in your path, or (2) specify the directory where your
	just-built ``llvm-gcc`` is installed using
	``--with-llvmgccdir=$LLVM_GCC_DIR``.

	You must also tell the configure machinery that the test suite is
	available so it can be configured for your build tree:

	.. code-block:: bash

	% cd $LLVM_OBJ_ROOT ; $LLVM_SRC_ROOT/configure [--with-llvmgccdir=$LLVM_GCC_DIR]

	[Remember that ``$LLVM_GCC_DIR`` is the directory where you
	installed llvm-gcc, not its src or obj directory.]

	#. You can now run the test suite from your build tree as follows:

	.. code-block:: bash

	% cd $LLVM_OBJ_ROOT/projects/test-suite
	% make

	Note that the second and third steps only need to be done once. After
	you have the suite checked out and configured, you don't need to do it
	again (unless the test code or configure script changes).

	Configuring External Tests
	--------------------------

	In order to run the External tests in the ``test-suite`` module, you
	must specify --with-externals. This must be done during the
	re-configuration step (see above), and the ``llvm`` re-configuration
	must recognize the previously-built ``llvm-gcc``. If any of these is
	missing or neglected, the External tests won't work.

	* --with-externals

	* --with-externals=<directory>

	This tells LLVM where to find any external tests. They are expected to
	be in specifically named subdirectories of <``directory``>. If
	``directory`` is left unspecified, ``configure`` uses the default value
	``/home/vadve/shared/benchmarks/speccpu2000/benchspec``. Subdirectory
	names known to LLVM include:

	* spec95

	* speccpu2000

	* speccpu2006

	* povray31

	Others are added from time to time, and can be determined from
	``configure``.

	Running different tests
	-----------------------

	In addition to the regular "whole program" tests, the ``test-suite``
	module also provides a mechanism for compiling the programs in different
	ways. If the variable TEST is defined on the ``gmake`` command line, the
	test system will include a Makefile named
	``TEST.<value of TEST variable>.Makefile``. This Makefile can modify
	build rules to yield different results.

	For example, the LLVM nightly tester uses ``TEST.nightly.Makefile`` to
	create the nightly test reports. To run the nightly tests, run
	``gmake TEST=nightly``.

	There are several TEST Makefiles available in the tree. Some of them are
	designed for internal LLVM research and will not work outside of the
	LLVM research group. They may still be valuable, however, as a guide to
	writing your own TEST Makefile for any optimization or analysis passes
	that you develop with LLVM.

	Generating test output
	----------------------

	There are a number of ways to run the tests and generate output. The
	most simple one is simply running ``gmake`` with no arguments. This will
	compile and run all programs in the tree using a number of different
	methods and compare results. Any failures are reported in the output,
	but are likely drowned in the other output. Passes are not reported
	explicitly.

	Somewhat better is running ``gmake TEST=sometest test``, which runs the
	specified test and usually adds per-program summaries to the output
	(depending on which sometest you use). For example, the ``nightly`` test
	explicitly outputs TEST-PASS or TEST-FAIL for every test after each
	program. Though these lines are still drowned in the output, it's easy
	to grep the output logs in the Output directories.

	Even better are the ``report`` and ``report.format`` targets (where
	``format`` is one of ``html``, ``csv``, ``text`` or ``graphs``). The
	exact contents of the report are dependent on which ``TEST`` you are
	running, but the text results are always shown at the end of the run and
	the results are always stored in the ``report.<type>.format`` file (when
	running with ``TEST=<type>``). The ``report`` also generate a file
	called ``report.<type>.raw.out`` containing the output of the entire
	test run.

	Writing custom tests for the test suite
	---------------------------------------

	Assuming you can run the test suite, (e.g.
	"``gmake TEST=nightly report``" should work), it is really easy to run
	optimizations or code generator components against every program in the
	tree, collecting statistics or running custom checks for correctness. At
	base, this is how the nightly tester works, it's just one example of a
	general framework.

	Lets say that you have an LLVM optimization pass, and you want to see
	how many times it triggers. First thing you should do is add an LLVM
	`statistic <ProgrammersManual.html#Statistic>`_ to your pass, which will
	tally counts of things you care about.

	Following this, you can set up a test and a report that collects these
	and formats them for easy viewing. This consists of two files, a
	"``test-suite/TEST.XXX.Makefile``" fragment (where XXX is the name of
	your test) and a "``test-suite/TEST.XXX.report``" file that indicates
	how to format the output into a table. There are many example reports of
	various levels of sophistication included with the test suite, and the
	framework is very general.

	If you are interested in testing an optimization pass, check out the
	"libcalls" test as an example. It can be run like this:

	.. code-block:: bash

	% cd llvm/projects/test-suite/MultiSource/Benchmarks # or some other level
	% make TEST=libcalls report

	This will do a bunch of stuff, then eventually print a table like this:

	::

	Name \| total \| #exit \|
	...
	FreeBench/analyzer/analyzer \| 51 \| 6 \|
	FreeBench/fourinarow/fourinarow \| 1 \| 1 \|
	FreeBench/neural/neural \| 19 \| 9 \|
	FreeBench/pifft/pifft \| 5 \| 3 \|
	MallocBench/cfrac/cfrac \| 1 \| * \|
	MallocBench/espresso/espresso \| 52 \| 12 \|
	MallocBench/gs/gs \| 4 \| * \|
	Prolangs-C/TimberWolfMC/timberwolfmc \| 302 \| * \|
	Prolangs-C/agrep/agrep \| 33 \| 12 \|
	Prolangs-C/allroots/allroots \| * \| * \|
	Prolangs-C/assembler/assembler \| 47 \| * \|
	Prolangs-C/bison/mybison \| 74 \| * \|
	...

	This basically is grepping the -stats output and displaying it in a
	table. You can also use the "TEST=libcalls report.html" target to get
	the table in HTML form, similarly for report.csv and report.tex.

	The source for this is in ``test-suite/TEST.libcalls.*``. The format is
	pretty simple: the Makefile indicates how to run the test (in this case,
	"``opt -simplify-libcalls -stats``"), and the report contains one line
	for each column of the output. The first value is the header for the
	column and the second is the regex to grep the output of the command
	for. There are lots of example reports that can do fancy stuff.