1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>LLVM Test Suite Guide</title>
<link rel="stylesheet" href="llvm.css" type="text/css">
</head>
<body>
<div class="doc_title">
LLVM Test Suite Guide
</div>
<ol>
<li><a href="#overview">Overview</a></li>
<li><a href="#Requirements">Requirements</a></li>
<li><a href="#quick">Quick Start</a></li>
<li><a href="#org">LLVM Test Suite Organization</a>
<ul>
<li><a href="#codefragments">Code Fragments</a></li>
<li><a href="#wholeprograms">Whole Programs</a></li>
</ul>
</li>
<li><a href="#tree">LLVM Test Suite Tree</a></li>
<li><a href="#dgstructure">DejaGNU Structure</a></li>
<li><a href="#progstructure"><tt>llvm-test</tt> Structure</a></li>
<li><a href="#run">Running the LLVM Tests</a></li>
<li><a href="#nightly">Running the nightly tester</a></li>
</ol>
<div class="doc_author">
<p>Written by John T. Criswell, <a
href="http://llvm.x10sys.com/rspencer">Reid Spencer</a>, and Tanya Lattner</p>
</div>
<!--=========================================================================-->
<div class="doc_section"><a name="overview">Overview</a></div>
<!--=========================================================================-->
<div class="doc_text">
<p>This document is the reference manual for the LLVM test suite. It documents
the structure of the LLVM test suite, the tools needed to use it, and how to add
and run tests.</p>
</div>
<!--=========================================================================-->
<div class="doc_section"><a name="Requirements">Requirements</a></div>
<!--=========================================================================-->
<div class="doc_text">
<p>In order to use the LLVM test suite, you will need all of the software
required to build LLVM, plus the following:</p>
<dl>
<dt><a href="http://www.gnu.org/software/dejagnu/">DejaGNU</a></dt>
<dd>The Feature and Regressions tests are organized and run by DejaGNU.</dd>
<dt><a href="http://expect.nist.gov/">Expect</a></dt>
<dd>Expect is required by DejaGNU.</dd>
<dt><a href="http://www.tcl.tk/software/tcltk/">tcl</a></dt>
<dd>Tcl is required by DejaGNU. </dd>
<dt><a href="http://www.netlib.org/f2c">F2C</a></dt>
<dd>For now, LLVM does not have a Fortran front-end, but using F2C, we can run
Fortran benchmarks. F2C support must be enabled via <tt>configure</tt> if not
installed in a standard place. F2C requires three items: the <tt>f2c</tt>
executable, <tt>f2c.h</tt> to compile the generated code, and <tt>libf2c.a</tt>
to link generated code. By default, given an F2C directory <tt>$DIR</tt>, the
configure script will search <tt>$DIR/bin</tt> for <tt>f2c</tt>,
<tt>$DIR/include</tt> for <tt>f2c.h</tt>, and <tt>$DIR/lib</tt> for
<tt>libf2c.a</tt>. The default <tt>$DIR</tt> values are: <tt>/usr</tt>,
<tt>/usr/local</tt>, <tt>/sw</tt>, and <tt>/opt</tt>. If you installed F2C in a
different location, you must tell <tt>configure</tt>:
<ul>
<li><tt>./configure --with-f2c=$DIR</tt><br>
This will specify a new <tt>$DIR</tt> for the above-described search
process. This will only work if the binary, header, and library are in their
respective subdirectories of <tt>$DIR</tt>.</li>
<li><tt>./configure --with-f2c-bin=/binary/path --with-f2c-inc=/include/path
--with-f2c-lib=/lib/path</tt><br>
This allows you to specify the F2C components separately. Note: if you choose
this route, you MUST specify all three components, and you need to only specify
<em>directories</em> where the files are located; do NOT include the
filenames themselves on the <tt>configure</tt> line.</li>
</ul></dd>
</dl>
</div>
<!--=========================================================================-->
<div class="doc_section"><a name="quick">Quick Start</a></div>
<!--=========================================================================-->
<div class="doc_text">
<p>The tests are located in two separate CVS modules. The basic feature and
regression tests are in the main "llvm" module under the directory
<tt>llvm/test</tt>. A more comprehensive test suite that includes whole
programs in C and C++ is in the <tt>llvm-test</tt> module. This module should
be checked out to the <tt>llvm/projects</tt> directory. When you
<tt>configure</tt> the <tt>llvm</tt> module, the <tt>llvm-test</tt> module
will be automatically configured. Alternatively, you can configure the <tt>llvm-test</tt> module manually.</p>
<p>To run all of the simple tests in LLVM using DejaGNU, use the master Makefile in the
<tt>llvm/test</tt> directory:</p>
<pre>
% gmake -C llvm/test
</pre>
or<br>
<pre>
% gmake check
</pre>
<p>To run only a subdirectory of tests in llvm/test using DejaGNU (ie.
Regression/Transforms), just set the TESTSUITE variable to the path of the
subdirectory (relative to <tt>llvm/test</tt>):</p>
<pre>
% gmake -C llvm/test TESTSUITE=Regression/Transforms
</pre>
<p><b>Note: If you are running the tests with <tt>objdir != subdir</tt>, you
must have run the complete testsuite before you can specify a
subdirectory.</b></p>
<p>To run the comprehensive test suite (tests that compile and execute whole
programs), run the <tt>llvm-test</tt> tests:</p>
<pre>
% cd llvm/projects
% cvs co llvm-test
% cd llvm-test
% ./configure --with-llvmsrc=$LLVM_SRC_ROOT --with-llvmobj=$LLVM_OBJ_ROOT
% gmake
</pre>
</div>
<!--=========================================================================-->
<div class="doc_section"><a name="org">LLVM Test Suite Organization</a></div>
<!--=========================================================================-->
<div class="doc_text">
<p>The LLVM test suite contains two major categories of tests: code
fragments and whole programs. Code fragments are in the <tt>llvm</tt> module
under the <tt>llvm/test</tt> directory. The whole programs
test suite is in the <tt>llvm-test</tt> module under the main directory.</p>
</div>
<div class="doc_subsection"><a name="codefragments">Code Fragments</a>
</div>
<div class="doc_text">
<p>Code fragments are small pieces of code that test a specific feature of LLVM
or trigger a specific bug in LLVM. They are usually written in LLVM assembly
language, but can be written in other languages if the test targets a particular
language front end.</p>
<p>Code fragments are not complete programs, and they are never executed to
determine correct behavior.</p>
<p>These code fragment tests are located in the <tt>llvm/test/Features</tt> and
<tt>llvm/test/Regression</tt> directories.</p>
</div>
<div class="doc_subsection"><a name="wholeprograms">Whole Programs</a></div>
<div class="doc_text">
<p>Whole Programs are pieces of code which can be compiled and linked into a
stand-alone program that can be executed. These programs are generally written
in high level languages such as C or C++, but sometimes they are written
straight in LLVM assembly.</p>
<p>These programs are compiled and then executed using several different
methods (native compiler, LLVM C backend, LLVM JIT, LLVM native code generation,
etc). The output of these programs is compared to ensure that LLVM is compiling
the program correctly.</p>
<p>In addition to compiling and executing programs, whole program tests serve as
a way of benchmarking LLVM performance, both in terms of the efficiency of the
programs generated as well as the speed with which LLVM compiles, optimizes, and
generates code.</p>
<p>All "whole program" tests are located in the <tt>llvm-test</tt> CVS
module.</p>
</div>
<!--=========================================================================-->
<div class="doc_section"><a name="tree">LLVM Test Suite Tree</a></div>
<!--=========================================================================-->
<div class="doc_text">
<p>Each type of test in the LLVM test suite has its own directory. The major
subtrees of the test suite directory tree are as follows:</p>
<ul>
<li><tt>llvm/test/Features</tt>
<p>This directory contains sample codes that test various features of the
LLVM language. These pieces of sample code are run through various
assembler, disassembler, and optimizer passes.</p>
</li>
<li><tt>llvm/test/Regression</tt>
<p>This directory contains regression tests for LLVM. When a bug is found
in LLVM, a regression test containing just enough code to reproduce the
problem should be written and placed somewhere underneath this directory.
In most cases, this will be a small piece of LLVM assembly language code,
often distilled from an actual application or benchmark.</p>
</li>
<li><tt>llvm-test</tt>
<p>The <tt>llvm-test</tt> CVS module contains 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.</p>
<p>In addition for testing correctness, the <tt>llvm-test</tt> 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.</p></li>
<li><tt>llvm-test/SingleSource</tt>
<p>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.</p></li>
<li><tt>llvm-test/MultiSource</tt>
<p>The MultiSource directory contains subdirectories which contain entire
programs with multiple source files. Large benchmarks and whole applications
go here.</p></li>
<li><tt>llvm-test/External</tt>
<p>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 presence and
location of these external programs is configured by the llvm-test
<tt>configure</tt> script.</p></li>
</ul>
</div>
<!--=========================================================================-->
<div class="doc_section"><a name="dgstructure">DejaGNU Structure</a></div>
<!--=========================================================================-->
<div class="doc_text">
<p>The LLVM test suite is partially driven by DejaGNU and partially
driven by GNU Make. Specifically, the Features and Regression tests
are all driven by DejaGNU. The <tt>llvm-test</tt>
module is currently driven by a set of Makefiles.</p>
<p>The DejaGNU structure is very simple, but does require some
information to be set. This information is gathered via <tt>configure</tt> and
is written to a file, <
|
