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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_NEW "
title="NEW - [Compile Time] 50% of time spent in Elim phi nodes"
href="https://bugs.llvm.org/show_bug.cgi?id=44249">44249</a>
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<th>Summary</th>
<td>[Compile Time] 50% of time spent in Elim phi nodes
</td>
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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>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Register Allocator
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>paulsson@linux.vnet.ibm.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, quentin.colombet@gmail.com
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<p>
<div>
<pre>clang -O3 -march=z13 tc_ctime_elimphi_gvn.i -o a.out -w -ftime-report
---User Time--- --System Time-- --User+System-- ---Wall Time--- --- Name
---
230.3186 ( 51.8%) 0.1120 ( 16.9%) 230.4306 ( 51.7%) 232.3138 ( 51.7%)
Eliminate PHI nodes for register allocation
101.7915 ( 22.9%) 0.1046 ( 15.8%) 101.8961 ( 22.9%) 102.6262 ( 22.8%)
Global Value Numbering
17.3571 ( 3.9%) 0.0178 ( 2.7%) 17.3749 ( 3.9%) 17.5102 ( 3.9%) Memory
SSA #2
8.7322 ( 2.0%) 0.0129 ( 2.0%) 8.7451 ( 2.0%) 8.8148 ( 2.0%) Greedy
Register Allocator
8.4621 ( 1.9%) 0.0887 ( 13.4%) 8.5508 ( 1.9%) 8.6025 ( 1.9%)
SystemZ DAG->DAG Pattern Instruction Selection
gcc -O3: 74s
clang -O3: 446s
(csmith)</pre>
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