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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [llvm-mca] Let scheduling models optionally specify the number of instructions retired per cycle."
href="https://bugs.llvm.org/show_bug.cgi?id=36661">36661</a>
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<th>Summary</th>
<td>[llvm-mca] Let scheduling models optionally specify the number of instructions retired per cycle.
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<th>Product</th>
<td>new-bugs
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<th>Version</th>
<td>unspecified
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Windows NT
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>new bugs
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>andrea.dibiagio@gmail.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>The idea is to let models optionally specify the maximum number of instructions
that can be retired per cycle.
At the moment, the LLVM machine model doesn't allow to specify the retire
throughput.
It should be easy to add that information in tablegen, and then have
llvm-mca query the machine scheduling model to get that value and correctly set
it for the analyzed CPU.
Example: on BtVer2, the retire control unit can retire up to 2 instructions per
cycle. At the moment, the only way to limit the retire throughput in llvm-mca,
is by using the command line flag -max-retire-per-cycle.</pre>
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