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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Backend fails at __builtin_ia32_rdrand32_step, if driver is missing -mrdrnd"
href="http://llvm.org/bugs/show_bug.cgi?id=22552">22552</a>
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<th>Summary</th>
<td>Backend fails at __builtin_ia32_rdrand32_step, if driver is missing -mrdrnd
</td>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>LLVM Codegen
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>ismail.pazarbasi@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>This seems more like a bug than QoI issue. Given:
int /*__attribute__((target("randr")))*/ f() {
unsigned int v;
__builtin_ia32_rdrand32_step(&v);
return v;
}
Without -mrdrnd, clang exits with code 70.
fatal error: error in backend: Cannot select: 0x63a57d0: i32,glue,ch =
X86ISD::RDRAND 0x636c0d0 [ORD=2] [ID=5]
In function: _Z1fv
clang-3.7: error: clang frontend command failed with exit code 70 (use -v to
see invocation)
With -mrdrnd, works as expected.
% clang -c -o randr.o randr.cpp -mrdrnd && echo $?
0
Perhaps, we can warn/error about about missing features.</pre>
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