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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Make XRay support timestamp emulation in x86_64"
href="http://bugs.llvm.org/show_bug.cgi?id=32148">32148</a>
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<th>Summary</th>
<td>Make XRay support timestamp emulation in x86_64
</td>
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<th>Product</th>
<td>XRay
</td>
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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>
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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
</td>
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<th>Component</th>
<td>Runtime
</td>
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<th>Assignee</th>
<td>dberris@google.com
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<th>Reporter</th>
<td>dberris@google.com
</td>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, rnk@google.com
</td>
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<p>
<div>
<pre>Currently, XRay hard-fails to initialise on x86_64 machines that don't have
support for rdtscp enabled to user-space programs. Some POSIX operating systems
disable these for various reasons.
We currently have an alternative implementation being used in non-x86_64
systems where we don't have a user-space available cycle counter implementation
that emulates the tsc data. XRay should instead try to use this implementation
(or something very similar) instead of hard-failing to initialise.
This currently shows up in some build bots as test failures for XRay runtime
tests where it fails to detect rdstcp support.</pre>
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