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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [X86] -march=native doesn't work on non-Intel/AMD CPUs"
href="https://bugs.llvm.org/show_bug.cgi?id=46292">46292</a>
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<th>Summary</th>
<td>[X86] -march=native doesn't work on non-Intel/AMD CPUs
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<th>Product</th>
<td>libraries
</td>
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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>Windows NT
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Backend: X86
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>craig.topper@gmail.com
</td>
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<th>CC</th>
<td>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk, spatel+llvm@rotateright.com
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<p>
<div>
<pre>-march=native calls getHostCPUName tries various ways to determine a CPU name.
If the CPUID vendor says Intel we try a combination of Family/Model
identification followed by a fall back to guessing based on features. For AMD
we only look at Family/Model and if the family/model check fails we report
"generic". If CPUID isn't supported or the vendor isn't AMD or Intel we return
"generic".
Any case that returns "generic" will be rejected by clang -cc1.
We should probably do something sane and at least try to find SSE2 or long mode
before falling back to generic.</pre>
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