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Chris Lattnerb40efb32003-12-14 05:03:43 +0000[diff] [blame]6 <title>LLVM 1.2 Release Notes</title>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]7</head>
8<body>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]9
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]10<div class="doc_title">
Chris Lattnerb40efb32003-12-14 05:03:43 +0000[diff] [blame]11 LLVM 1.2 Release Notes
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]12</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]13
14<ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]15 <li><a href="#intro">Introduction</a></li>
16 <li><a href="#whatsnew">What's New?</a></li>
17 <li><a href="#portability">Portability and Supported Platforms</a></li>
18 <li><a href="#install-instructions">Installation Instructions</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]19 <li><a href="#knownproblems">Known Problems</a>
20 <ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]21 <li><a href="#core">Known problems with the LLVM Core</a>
22 <li><a href="#c-fe">Known problems with the C Front-end</a>
23 <li><a href="#c++-fe">Known problems with the C++ Front-end</a>
24 <li><a href="#x86-be">Known problems with the X86 Back-end</a>
25 <li><a href="#sparc-be">Known problems with the Sparc Back-end</a>
26 <li><a href="#c-be">Known problems with the C back-end</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]27 </ul></li>
28 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]29</ol>
30
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]31<div class="doc_text">
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]32 <p><b>Written by the <a href="http://llvm.cs.uiuc.edu">LLVM team</a></b><p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]33</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]34
35<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]36<div class="doc_section">
37 <a name="intro">Introduction</a>
38</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]39<!-- *********************************************************************** -->
40
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]41<div class="doc_text">
42
43<p>This document contains the release notes for the LLVM compiler
Chris Lattnerb40efb32003-12-14 05:03:43 +0000[diff] [blame]44infrastructure, release 1.2. Here we describe the status of LLVM, including any
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]45known problems and bug fixes from the previous release. The most up-to-date
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]46version of this document can be found on the <a
Chris Lattnerb40efb32003-12-14 05:03:43 +0000[diff] [blame]47href="http://llvm.cs.uiuc.edu/releases/1.2/">LLVM 1.2 web site</a>. If you are
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]48not reading this on the LLVM web pages, you should probably go there because
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]49this document may be updated after the release.</p>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]50
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]51<p>For more information about LLVM, including information about potentially more
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]52current releases, please check out the <a href="http://llvm.cs.uiuc.edu">main
53web site</a>. If you have questions or comments, the <a
54href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM developer's mailing
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]55list</a> is a good place to send them.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]56
Chris Lattner9e848092003-12-12 04:25:33 +0000[diff] [blame]57<p>Note that if you are reading this file from CVS, this document applies
58to the <i>next</i> release, not the current one. To see the release notes for
59the current or previous releases, see the <a
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]60href="http://llvm.cs.uiuc.edu/releases/">releases page</a>.</p>
61
62</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]63
64<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]65<div class="doc_section">
66 <a name="whatsnew">What's New?</a>
67</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]68<!-- *********************************************************************** -->
69
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]70<div class="doc_text">
71
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]72<p>This is the third public release of the LLVM compiler infrastructure.
Chris Lattnerb40efb32003-12-14 05:03:43 +0000[diff] [blame]73</p>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]74
Chris Lattner1124e2c2003-12-12 21:33:08 +0000[diff] [blame]75<p>At this time, LLVM is known to correctly compile and run all non-unwinding C
76&amp; C++ SPEC CPU2000 benchmarks, the Olden benchmarks, and the Ptrdist
77benchmarks. It has also been used to compile <b>many</b> other programs. LLVM
78now also works with a broad variety of C++ programs, though it has still
79received much less testing than the C front-end.
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]80</p>
81
82<p>
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]83The LLVM native code generators are very stable but do not currently support
Chris Lattner1124e2c2003-12-12 21:33:08 +0000[diff] [blame]84unwinding (exception throwing or <tt>longjmp</tt>ing), which prevent them from
85working with programs like the <tt>253.perlbmk</tt> in SPEC CPU2000. The C
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]86backend and the rest of LLVM supports these programs, so you can
Chris Lattner1124e2c2003-12-12 21:33:08 +0000[diff] [blame]87still use LLVM with them. Support for unwinding will be added in a future
88release.
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]89</p>
90
91
92<!--=========================================================================-->
93<div class="doc_subsubsection">
94This release implements the following new features:
95</div>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]96
97<ol>
Chris Lattnerb40efb32003-12-14 05:03:43 +0000[diff] [blame]98<li></li>
99<li></li>
Chris Lattner55ee0312003-11-19 22:05:38 +0000[diff] [blame]100</ol>
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]101
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]102
103<!--=========================================================================-->
104<div class="doc_subsubsection">
105In this release, the following missing features were implemented:
106</div>
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]107
108<ol>
Chris Lattnerb40efb32003-12-14 05:03:43 +0000[diff] [blame]109<li></li>
110<li></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]111</ol>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]112
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]113
114<!--=========================================================================-->
115<div class="doc_subsubsection">
Chris Lattner9e259062003-12-19 06:31:56 +0000[diff] [blame^]116In this release, the following Code Quality issues were fixed:
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]117</div>
Chris Lattner89ca2b82003-10-27 17:06:39 +0000[diff] [blame]118
119<ol>
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]120
Chris Lattner9e259062003-12-19 06:31:56 +0000[diff] [blame^]121<li><a href="http://llvm.cs.uiuc.edu/PR187">[loopsimplify] Many pointless phi nodes are created</a></li>
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]122
Chris Lattnerb40efb32003-12-14 05:03:43 +0000[diff] [blame]123<li></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]124</ol>
Chris Lattner89ca2b82003-10-27 17:06:39 +0000[diff] [blame]125
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]126
127<!--=========================================================================-->
128<div class="doc_subsubsection">
129In this release, the following bugs in the previous release were fixed:
130</div>
131
132<p>Bugs in the LLVM Core:</p>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]133
134<ol>
Misha Brukmanad643852003-12-15 22:48:12 +0000[diff] [blame]135<li><a href="http://llvm.cs.uiuc.edu/PR179">[licm] LICM promotes volatile memory
136locations to registers</a></li>
Chris Lattner5b7142a2003-12-18 08:16:25 +0000[diff] [blame]137<li><a href="http://llvm.cs.uiuc.edu/PR191">[licm] Memory read after free causes
138infrequent crash</a></li>
Chris Lattnerb40efb32003-12-14 05:03:43 +0000[diff] [blame]139
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]140</ol>
141
142
143<p>Bugs in the C/C++ front-end:</p>
144
145<ol>
Misha Brukmanad643852003-12-15 22:48:12 +0000[diff] [blame]146<li><a href="http://llvm.cs.uiuc.edu/PR186">Need weak linkage on memory
147management functions in libc runtime to allow them to be overriden</a></li>
Chris Lattnerb40efb32003-12-14 05:03:43 +0000[diff] [blame]148<li></li>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]149</ol>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]150
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]151</div>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]152
153<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]154<div class="doc_section">
155 <a name="portability">Portability and Supported Platforms</a>
156</div>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]157<!-- *********************************************************************** -->
158
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]159<div class="doc_text">
160
161<p>LLVM has been extensively tested on Intel and AMD machines running Red
Chris Lattnerb40efb32003-12-14 05:03:43 +0000[diff] [blame]162Hat Linux and FreeBSD. It has also been tested on Sun UltraSPARC workstations running Solaris 8.
John Criswellbb1bad52003-12-12 19:54:20 +0000[diff] [blame]163Additionally,
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]164LLVM works on Mac OS X 10.3 and above, but only with the C backend or
Chris Lattner9e848092003-12-12 04:25:33 +0000[diff] [blame]165interpreter (no native backend for the PowerPC is available yet).
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]166The core LLVM infrastructure uses "autoconf" for portability, so hopefully we
Chris Lattner3e2959e2003-11-08 05:22:09 +0000[diff] [blame]167work on more platforms than that. However, it is likely that we
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]168missed something and that minor porting is required to get LLVM to work on
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]169new platforms. We welcome portability patches and error messages.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]170
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]171</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]172
173<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]174<div class="doc_section">
175 <a name="knownproblems">Known Problems</a>
176</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]177<!-- *********************************************************************** -->
178
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]179<div class="doc_text">
180
181<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]182component. As new problems are discovered, they will be added to these
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]183sections. If you run into a problem, please check the <a
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]184href="http://llvm.cs.uiuc.edu/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]185there isn't already one.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]186
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]187</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]188
189<!-- _______________________________________________________________________ -->
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]190<!--
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]191</ul><h4><a name="portability"><hr size=0>Portability Problems</h4><ul>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]192-->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]193
194
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]195<!-- ======================================================================= -->
196<div class="doc_subsection">
197 <a name="core">Known problems with the LLVM Core</a>
198</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]199
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]200<div class="doc_text">
201
202<ul>
203
204<li>In the JIT, <tt>dlsym</tt> on a symbol compiled by the JIT will not
205work.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]206
207<li>The JIT does not use mutexes to protect its internal data structures. As
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]208such, execution of a threaded program could cause these data structures to be
209corrupted.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]210
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]211<li>It is not possible to <tt>dlopen</tt> an LLVM bytecode file in the JIT.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]212
Chris Lattnere84843b2003-10-20 19:05:03 +0000[diff] [blame]213<li>Linking in static archive files (.a files) is very slow (there is no symbol
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]214table in the archive).</li>
Chris Lattner2855ecd2003-11-04 20:06:53 +0000[diff] [blame]215
Chris Lattner2855ecd2003-11-04 20:06:53 +0000[diff] [blame]216<li><a href="http://llvm.cs.uiuc.edu/PR82">LLVM cannot handle structures with
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]217more than 256 elements</a>.</li>
218
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]219<li>
220The gccld program
221<a href="http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=139">
222does not link objects/archives in the order specified on the command line.
223</a>
224</li>
225
226<li>
227<a href="http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=174">
228Tail duplication does not update SSA form correctly.
229</a>
230</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]231</ul>
232
233</div>
234
235<!-- ======================================================================= -->
236<div class="doc_subsection">
237 <a name="c-fe">Known problems with the C front-end</a>
238</div>
Chris Lattner47588f92003-10-02 05:07:23 +0000[diff] [blame]239
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]240<!-- _______________________________________________________________________ -->
Chris Lattnerb40efb32003-12-14 05:03:43 +0000[diff] [blame]241<div class="doc_subsubsection">Bugs</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]242
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]243<div class="doc_text">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]244<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]245<li>C99 Variable sized arrays do not release stack memory when they go out of
246 scope. Thus, the following program may run out of stack space:
247<pre>
248 for (i = 0; i != 1000000; ++i) {
249 int X[n];
250 foo(X);
251 }
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]252</pre></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]253
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]254<li>
255Initialization of global union variables can only be done
256<a href="http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=162">with the largest
257union member</a>.
258</li>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]259
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]260<li>
261<a href="http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=182">
262Functions marked "extern inline" are not compiled into LLVM with linkonce
263linkage.
264</a>
265</li>
266
267
268<li>
269The memory management functions in the libc runtime
270<a href="http://llvm.cs.uiuc.edu/PR186">need weak linkage so that they can be
271overridden.
272</a>
273</li>
274</ul>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]275</div>
276
277<!-- _______________________________________________________________________ -->
278<div class="doc_subsubsection">
279 Notes
280</div>
281
282<div class="doc_text">
283
284<ul>
285
286<li>Inline assembly is not yet supported.</li>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]287
288<li>"long double" is transformed by the front-end into "double". There is no
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]289support for floating point data types of any size other than 32 and 64
290bits.</li>
291
292<li>The following Unix system functionality has not been tested and may not
293work:
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]294 <ol>
295 <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
296 appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that
297 <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly.
298 <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt>
299 - These functions have not been tested.
300 </ol></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]301
302<li>Although many GCC extensions are supported, some are not. In particular,
303 the following extensions are known to <b>not be</b> supported:
304 <ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]305 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Local-Labels.html#Local%20Labels">Local Labels</a>: Labels local to a block.</li>
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]306 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html#Labels%20as%20Values">Labels as Values</a>: Getting pointers to labels and computed gotos.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]307 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Nested-Functions.html#Nested%20Functions">Nested Functions</a>: As in Algol and Pascal, lexical scoping of functions.</li>
308 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li>
309 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html#Extended%20Asm">Extended Asm</a>: Assembler instructions with C expressions as operands.</li>
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]310 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constraints.html#Constraints">Constraints</a>: Constraints for asm operands.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]311 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Asm-Labels.html#Asm%20Labels">Asm Labels</a>: Specifying the assembler name to use for a C symbol.</li>
312 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Explicit-Reg-Vars.html#Explicit%20Reg%20Vars">Explicit Reg Vars</a>: Defining variables residing in specified registers.</li>
313 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Return-Address.html#Return%20Address">Return Address</a>: Getting the return or frame address of a function.</li>
314 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Vector-Extensions.html#Vector%20Extensions">Vector Extensions</a>: Using vector instructions through built-in functions.</li>
315 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Target-Builtins.html#Target%20Builtins">Target Builtins</a>: Built-in functions specific to particular targets.</li>
316 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Thread-Local.html#Thread-Local">Thread-Local</a>: Per-thread variables.</li>
317 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Pragmas.html#Pragmas">Pragmas</a>: Pragmas accepted by GCC.</li>
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]318 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]319
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]320 <p>The following GCC extensions are <b>partially</b> supported. An ignored
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]321 attribute means that the LLVM compiler ignores the presence of the attribute,
322 but the code should still work. An unsupported attribute is one which is
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]323 ignored by the LLVM compiler and will cause a different interpretation of
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]324 the program.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]325
326 <ol>
327 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
328 Arrays whose length is computed at run time.<br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]329 Supported, but allocated stack space is not freed until the function returns (noted above).</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]330
331 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html#Function%20Attributes">Function Attributes</a>:
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]332
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]333 Declaring that functions have no side effects or that they can never
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]334 return.<br>
335
336 <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
337 <tt>constructor</tt>, <tt>destructor</tt>, <tt>unused</tt>,
338 <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
339
340 <b>Ignored:</b> <tt>noreturn</tt>, <tt>noinline</tt>,
341 <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
342 <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
343
344 <b>Unsupported:</b> <tt>used</tt>, <tt>section</tt>, <tt>alias</tt>,
345 <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
346 <tt>fastcall</tt>, all other target specific attributes</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]347
348 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
349 Specifying attributes of variables.<br>
350 <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
351 <tt>deprecated</tt>, <tt>transparent_union</tt>,
352 <tt>unused</tt>, <tt>weak</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]353
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]354 <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
355 <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
356 <tt>vector_size</tt>, <tt>dllimport</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]357 <tt>dllexport</tt>, all target specific attributes.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]358
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]359 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html#Type%20Attributes">Type Attributes</a>: Specifying attributes of types.<br>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]360 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]361 <tt>deprecated</tt>, <tt>may_alias</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]362
363 <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>,
364 all target specific attributes.</li>
365
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]366 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
367 Other built-in functions.<br>
368 We support all builtins which have a C language equivalent (e.g.,
369 <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>,
370 <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]371 <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt> (ignored).</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]372
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]373 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]374
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]375 <p>The following extensions <b>are</b> known to be supported:</p>
376
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]377 <ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]378 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
379 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Typeof.html#Typeof">Typeof</a>: <code>typeof</code>: referring to the type of an expression.</li>
380 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Lvalues.html#Lvalues">Lvalues</a>: Using <code>?:</code>, "<code>,</code>" and casts in lvalues.</li>
381 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
382 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
383 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
384 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
385 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
386 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
387 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variadic-Macros.html#Variadic%20Macros">Variadic Macros</a>: Macros with a variable number of arguments.</li>
388 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
389 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Subscripting.html#Subscripting">Subscripting</a>: Any array can be subscripted, even if not an lvalue.</li>
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]390 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Pointer-Arith.html#Pointer%20Arith">Pointer Arith</a>: Arithmetic on <code>void</code>-pointers and function pointers.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]391 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Initializers.html#Initializers">Initializers</a>: Non-constant initializers.</li>
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]392 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
393or arrays as values.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]394 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html#Designated%20Inits">Designated Inits</a>: Labeling elements of initializers.</li>
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]395 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Cast-to-Union.html#Cast%20to%20Union">Cast to Union</a>: Casting to union type from any member of the union.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]396 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
397 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
398 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Prototypes.html#Function%20Prototypes">Function Prototypes</a>: Prototype declarations and old-style definitions.</li>
399 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/C---Comments.html#C++%20Comments">C++ Comments</a>: C++ comments are recognized.</li>
400 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
401 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Character-Escapes.html#Character%20Escapes">Character Escapes</a>: <code>\e</code> stands for the character &lt;ESC&gt;.</li>
402 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
403 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
404 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alternate-Keywords.html#Alternate%20Keywords">Alternate Keywords</a>:<code>__const__</code>, <code>__asm__</code>, etc., for header files.</li>
405 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Incomplete-Enums.html#Incomplete%20Enums">Incomplete Enums</a>: <code>enum foo;</code>, with details to follow.</li>
406 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Names.html#Function%20Names">Function Names</a>: Printable strings which are the name of the current function.</li>
407 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Unnamed-Fields.html#Unnamed%20Fields">Unnamed Fields</a>: Unnamed struct/union fields within structs/unions.</li>
408 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html#Attribute%20Syntax">Attribute Syntax</a>: Formal syntax for attributes.</li>
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]409 </ol></li>
410
411</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]412
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]413<p>If you run into GCC extensions which have not been included in any of these
414lists, please let us know (also including whether or not they work).</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]415
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]416</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]417
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]418<!-- ======================================================================= -->
419<div class="doc_subsection">
420 <a name="c++-fe">Known problems with the C++ front-end</a>
421</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]422
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]423<div class="doc_text">
424
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]425<p>For this release, the C++ front-end is considered to be fully functional but
Chris Lattner9e848092003-12-12 04:25:33 +0000[diff] [blame]426has not been tested as thoroughly as the C front-end. It has been tested and
427works for a number of non-trivial programs, but there may be lurking bugs.
428Please report any bugs or problems.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]429
430</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]431
432<!-- _______________________________________________________________________ -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]433<div class="doc_subsubsection">
434 Bugs
435</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]436
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]437<div class="doc_text">
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]438
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]439<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]440<li>The C++ front-end inherits all problems afflicting the <a href="#c-fe">C
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]441 front-end</a>.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]442
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]443<li>
444<a href="http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=137">
445Code is generated for empty classes.
446</a>
447</li>
448</ul>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]449</div>
450
451<!-- _______________________________________________________________________ -->
452<div class="doc_subsubsection">
453 Notes
454</div>
455
456<div class="doc_text">
457
458<ul>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]459
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]460<li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This
461parser is significantly more standards compliant (and picky) than prior GCC
462versions. For more information, see the C++ section of the <a
Chris Lattner9e848092003-12-12 04:25:33 +0000[diff] [blame]463href="http://gcc.gnu.org/gcc-3.4/changes.html">GCC 3.4 release notes</a>.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]464
465<li>Destructors for local objects are not always run when a <tt>longjmp</tt> is
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]466 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]467 function and in the <tt>setjmp</tt> receiver function may not be run.
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]468 Objects in intervening stack frames will be destroyed, however (which is
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]469 better than most compilers).</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]470
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]471<li>The LLVM C++ front-end follows the <a
472 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
473 This document, which is not Itanium specific, specifies a standard for name
474 mangling, class layout, v-table layout, RTTI formats, and other C++
475 representation issues. Because we use this API, code generated by the LLVM
476 compilers should be binary compatible with machine code generated by other
477 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
478 <i>However</i>, the exception handling mechanism used by LLVM is very
479 different from the model used in the Itanium ABI, so <b>exceptions will not
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]480 interact correctly</b>. </li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]481
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]482</ul>
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]483
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]484</div>
485
486<!-- ======================================================================= -->
487<div class="doc_subsection">
488 <a name="x86-be">Known problems with the X86 back-end</a>
489</div>
490
491<div class="doc_text">
492
493<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]494
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]495<li>The X86 code generator <a
Chris Lattner0d4379a2003-10-08 06:01:38 +0000[diff] [blame]496href="http://llvm.cs.uiuc.edu/PR16">does not currently
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]497support the <tt>unwind</tt> instruction</a>, so code that throws a C++ exception
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]498or calls the C <tt>longjmp</tt> function will abort.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]499
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]500</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]501
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]502</div>
503
504<!-- ======================================================================= -->
505<div class="doc_subsection">
506 <a name="sparc-be">Known problems with the Sparc back-end</a>
507</div>
508
509<div class="doc_text">
510
511<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]512
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]513<li>The Sparc code generator <a
Chris Lattner0d4379a2003-10-08 06:01:38 +0000[diff] [blame]514href="http://llvm.cs.uiuc.edu/PR15">does not currently
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]515support the <tt>unwind</tt> instruction</a>, so code that throws a C++ exception
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]516or calls the C <tt>longjmp</tt> function will abort.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]517
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]518<li>
519<a href="http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=167">
520The llc program can crash on legal code.
521</a>
522</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]523</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]524
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]525</div>
526
527<!-- ======================================================================= -->
528<div class="doc_subsection">
529 <a name="c-be">Known problems with the C back-end</a>
530</div>
531
532<div class="doc_text">
533
534<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]535
536<li>The C back-end produces code that violates the ANSI C Type-Based Alias
537Analysis rules. As such, special options may be necessary to compile the code
538(for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]539problem probably cannot be fixed.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]540
Chris Lattnere84843b2003-10-20 19:05:03 +0000[diff] [blame]541<li><a href="http://llvm.cs.uiuc.edu/PR33">Initializers for global variables</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]542cannot include special floating point numbers like Not-A-Number or
543Infinity.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]544
Chris Lattner2855ecd2003-11-04 20:06:53 +0000[diff] [blame]545<li><a href="http://llvm.cs.uiuc.edu/PR56">Zero arg vararg functions are not
Chris Lattner2af46052003-10-24 04:03:19 +0000[diff] [blame]546supported</a>. This should not affect LLVM produced by the C or C++
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]547frontends.</li>
Chris Lattner2af46052003-10-24 04:03:19 +0000[diff] [blame]548
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]549</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]550
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]551</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]552
553<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]554<div class="doc_section">
555 <a name="additionalinfo">Additional Information</a>
556</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]557<!-- *********************************************************************** -->
558
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]559<div class="doc_text">
560
561<p>A wide variety of additional information is available on the LLVM web page,
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]562including mailing lists and publications describing algorithms and components
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]563implemented in LLVM. The web page also contains versions of the API
564documentation which is up-to-date with the CVS version of the source code. You
565can access versions of these documents specific to this release by going into
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]566the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]567
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]568<p>If you have any questions or comments about LLVM, please feel free to contact
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]569us via the <a href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">mailing
570lists</a>.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]571
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]572</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]573
574<!-- *********************************************************************** -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]575
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]576<hr>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]577<address>
578 <a href="http://jigsaw.w3.org/css-validator/"><img
579 src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
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Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]583 <a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a><br>
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