<html>
<head>
<base href="https://llvm.org/bugs/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - ChromeOs+Clang is slower than gcc"
href="https://llvm.org/bugs/show_bug.cgi?id=24714">24714</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>ChromeOs+Clang is slower than gcc
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>yunlian@chromium.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>There is up to 23% slow down when building ChromeOS with clang compared with
gcc.
gcc clang
Amean StdDev Amean StdDev
GmeanSpeedup
Benchmark: page_cycler.intl_ar_fa_he
cold_times__page_load_time (ms) 1340.15 17.84 1442.03 2.80
-7.1%
warm_times__page_load_time (ms) 1138.02 11.49 1208.40 5.67
-5.8%
dom_traverse__dom_traverse (runs_per_s)247.89 1.29 238.58 3.26
3.8%
dom_modify__dom_modify (runs_per_s) 293.15 6.84 266.14 2.37
-9.2%
dom_query__dom_query (runs_per_s) 10641.70 54.41 8846.72 191.93
-2.2%
dom_attr__dom_attr (runs_per_s) 420.65 6.70 320.55 1.34
-23.8%
Benchmark: page_cycler.intl_es_fr_pt-BR
cold_times__page_load_time (ms) 1124.76 7.73 1206.06 7.26
-6.7%
warm_times__page_load_time (ms) 926.05 3.63 1010.50 8.46
-8.4%
Benchmark: page_cycler.netsim.top_10
cold_times__page_load_time (ms) 1574.24 235.63 2125.32 100.59
-26.7%
Benchmark: page_cycler.tough_layout_cases;
cold_times__page_load_time (ms) 3825.84 33.86 4130.14 19.08
-7.4%
warm_times__page_load_time (ms) 3593.45 34.40 3918.36 6.02
-8.3%
Benchmark: kraken; Iterations: 3
Total__Total (ms) 2509.57 10.33 2528.60 7.09
-0.8%
Benchmark: page_cycler.intl_ja_zh; Iterations: 3
cold_times__page_load_time (ms) 1225.20 5.22 1510.64 191.49
-18.2%
warm_times__page_load_time (ms) 1410.32 11.43 1415.92 155.38
+0.2%
Benchmark: robohornet_pro;
Total__Total (ms) 7568.33 143.88 7633.33 50.87
-0.9%
Benchmark: page_cycler.intl_hi_ru;
cold_times__page_load_time (ms) 1084.93 3.83 1184.85 7.88
-8.4%
warm_times__page_load_time (ms) 910.26 4.15 1006.45 13.55
-9.6%
Benchmark: sunspider;
Total__Total (ms) 397.63 3.79 394.20 0.54
+0.9%
Benchmark: page_cycler.intl_ko_th_vi;
cold_times__page_load_time (ms) 1579.75 6.85 1691.37 2.91
-6.6%
warm_times__page_load_time (ms) 1325.57 0.61 1447.71 10.09
-8.4%
Benchmark: page_cycler.typical_25;
cold_times__page_load_time (ms) 2039.44 15.94 2203.62 11.45
-7.5%
warm_times__page_load_time (ms) 1825.37 15.06 2000.92 13.10
-8.8%</pre>
</div>
</p>
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