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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Demo Kaleidoscope/MCJIT Produces Incorrect Output on ARM"
href="http://llvm.org/bugs/show_bug.cgi?id=20329">20329</a>
</td>
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<tr>
<th>Summary</th>
<td>Demo Kaleidoscope/MCJIT Produces Incorrect Output on ARM
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>mjllvmbugzilla@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=12778" name="attach_12778" title="makefile: originally missing --cxxflags for llvm-config (originally used -cppflags instead), missing -pthread, -ldl (-rdynamic?)">attachment 12778</a> <a href="attachment.cgi?id=12778&action=edit" title="makefile: originally missing --cxxflags for llvm-config (originally used -cppflags instead), missing -pthread, -ldl (-rdynamic?)">[details]</a></span>
makefile: originally missing --cxxflags for llvm-config (originally used
-cppflags instead), missing -pthread, -ldl (-rdynamic?)
The MCJIT demo on ARM is giving really weird results. I can make
Kaleidoscope/MCJIT/initial with the modification DataLayout->DataLayoutPass in
toy.cpp:794 (and modifications to the makefile to get it to compile - see
attached). For example, here is the output of running the example in
<a href="http://blog.llvm.org/2013/07/using-mcjit-with-kaleidoscope-tutorial.html">http://blog.llvm.org/2013/07/using-mcjit-with-kaleidoscope-tutorial.html</a>:
ready> def add(x y) x+y;
ready> Read function definition:
define double @add(double %x, double %y) {
entry:
%y2 = alloca double
%x1 = alloca double
store double %x, double* %x1
store double %y, double* %y2
%x3 = load double* %x1
%y4 = load double* %y2
%addtmp = fadd double %x3, %y4
ret double %addtmp
}
ready> add(1, 2);
ready> '+v4' is not a recognized feature for this target (ignoring feature)
'+v4' is not a recognized feature for this target (ignoring feature)
Evaluated to
123768009588030777259092341058613037990372763332928142171424007220604203591862480729676744321330132960305676357606152955695924029595789143784940761219741498249240641872295390588649097646388250067834919016059099656912063430656.000000
ready>
System is an Nvidia Jetson TK1 ARM Cortex A15 running Ubuntu 14.04 LTS. I am
using a CMake build of the LLVM 3.5 trunk revision 212499.
output of clang --version:
clang version 3.5.0 (212499)
Target: armv7l-unknown-linux-gnueabihf
Thread model: posix
I can compile C/C++ code and it runs correctly with clang. I tried searching
around and couldn't find any definitive information about whether JIT
compilation (with the MCJIT or otherwise) is supported on ARM. <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - ARMv7: Kaleidoscope "2" returns "1.000000"."
href="show_bug.cgi?id=17817">Bug 17817</a> seems
to suggest not, but doesn't include as much info as mine (and doesn't mention
the MCJIT) so I can't tell if this is expected or not. Any help appreciated.</pre>
</div>
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