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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Inline jump tables"
href="https://bugs.llvm.org/show_bug.cgi?id=40851">40851</a>
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<tr>
<th>Summary</th>
<td>Inline jump tables
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</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>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Interprocedural Optimizations
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>david.bolvansky@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>int square(int x) {
return x*x;
}
int add(int x) {
return x + x;
}
typedef int (*p) (int);
p arr[4] = {square, add};
int test(int x) {
int res = arr[1](x);
return res;
}
Expected:
test(int):
lea eax, [rdi+rdi]
ret
Currently:
test(int):
jmp [QWORD PTR arr[rip+8]]
------------
If the index to the jump table isn't a constant, should not be better to expand
"if else" chain like:
if (x==1) arr[1](x);
else if (x==2) arr[2](x);
..and then take an opportunity to inline functions?</pre>
</div>
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