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<base href="http://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - clang is unbearably slow to compile large function with computed goto"
href="http://llvm.org/bugs/show_bug.cgi?id=18161">18161</a>
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<th>Summary</th>
<td>clang is unbearably slow to compile large function with computed goto
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>new bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>notasas@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=11681" name="attach_11681" title="self-contained reproducer">attachment 11681</a> <a href="attachment.cgi?id=11681&action=edit" title="self-contained reproducer">[details]</a></span>
self-contained reproducer
Compiling attached file with various compilers:
$ time clang+llvm-3.3-amd64/bin/clang fametest.c -c -o fametest.o -O
real 187m31.733s
user 186m46.396s
sys 0m6.212s
$ time clang+llvm-3.3-amd64/bin/clang fametest.c -c -o fametest.o -O2
real 189m4.333s
user 188m23.232s
sys 0m2.972s
$ time clang+llvm-3.3-amd64/bin/clang fametest.c -c -o fametest.o -O0
real 0m0.856s
user 0m0.772s
sys 0m0.056s
trunk 196510:
$ Debug+Asserts/bin/clang fametest.c -c -o fametest2.o -O
<did not finish in 24h>
time ./Release/bin/clang fametest.c -c -o fametest_clangtrunk_rel.o -O
real 428m39.409s
user 427m2.568s
sys 0m11.472s
$ gcc -v
Target: x86_64-linux-gnu
gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5)
$ time gcc fametest.c -c -o fametest.o -O2
real 0m30.367s
user 0m29.208s
sys 0m0.936s
$ arm-open2x-linux-gcc -v
Target: arm-open2x-linux
gcc version 4.1.1
$ time arm-open2x-linux-gcc fametest.c -c -o fametest.o -O2
real 0m25.722s
user 0m22.552s
sys 0m2.760s</pre>
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