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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 - SimplifyCFG.cpp fails to build lookup tables in many cases"
href="https://bugs.llvm.org/show_bug.cgi?id=39046">39046</a>
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<tr>
<th>Summary</th>
<td>SimplifyCFG.cpp fails to build lookup tables in many cases
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<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>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>slandden@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre><a href="https://godbolt.org/z/QuklOn">https://godbolt.org/z/QuklOn</a>
#include <stdio.h>
int switchexample(unsigned char num) {
switch(num) {
case 0:
return 120;
case 1:
return 119;
case 3:
return 118;
case 4:
return 118;
case 11:
return 117;
case 12:
return 116;
case 13:
return 115;
case 14:
return 114;
case 15:
return 113;
case 16:
return 112;
case 17:
return 111;
case 18:
return 110;
case 19:
return 109;
case 37: //change this to 36 and it will use a lookup table
return 108;
case 35:
return 108;
default:
puts("hi");
return 1;
}
}
Noticed while working on 39013</pre>
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