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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - TargetMachine is not thread safe (but it really should be)"
href="https://llvm.org/bugs/show_bug.cgi?id=27361">27361</a>
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<th>Summary</th>
<td>TargetMachine is not thread safe (but it really should be)
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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>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
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<th>Component</th>
<td>Target Description Classes
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>davide@freebsd.org
</td>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
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<p>
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<pre>When doing parallel CodeGen we currently have to create a TargetMachine
per-thread because TargetMachine is not thread-safe.
This is a waste, and it would be nice if it can be avoided.
Also, having an immutable TargetMachine is a preliminary step needed if we want
at some point parallelize the backend.
Eric pointed out the least amount of work needed:
* Handle resetTargetOptions first (at least)
* An optional lock on getSubtarget
The subtarget itself should be fine, and if not, it should be fixed.</pre>
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