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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_CONFIRMED "
title="CONFIRMED - Offload kernel performance regression"
href="https://bugs.llvm.org/show_bug.cgi?id=49752">49752</a>
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<tr>
<th>Summary</th>
<td>Offload kernel performance regression
</td>
</tr>
<tr>
<th>Product</th>
<td>OpenMP
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>CONFIRMED
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Clang Compiler Support
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>xw111luoye@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>both 12.x and main branch are affected by this bug.
offending commit
bd756286d2e774716a12f55db27d070595058d53
before
nvlink info : Function properties for
'__omp_offloading_10304_1c00a0d__ZN11qmcplusplus17einspline_spo_ompIfE18multi_evaluate_vghERKSt6vectorIPNS_6SPOSetESaIS4_EERKS2_IPNS_11ParticleSetESaISA_EEi_l412':
nvlink info : used 244 registers, 80 stack, 1134 bytes smem, 416 bytes
cmem[0], 24 bytes cmem[2], 0 bytes lmem
after
nvlink info : Function properties for
'__omp_offloading_10304_1c00a0d__ZN11qmcplusplus17einspline_spo_ompIfE18multi_evaluate_vghERKSt6vectorIPNS_6SPOSetESaIS4_EERKS2_IPNS_11ParticleSetESaISA_EEi_l412':
nvlink info : used 244 registers, 360 stack, 1134 bytes smem, 416 bytes
cmem[0], 24 bytes cmem[2], 0 bytes lmem
huge increase in stack.</pre>
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</p>
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