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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - unable to optimize creation and use of a lookup table into the table entry"
href="https://bugs.llvm.org/show_bug.cgi?id=39643">39643</a>
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<th>Summary</th>
<td>unable to optimize creation and use of a lookup table into the table entry
</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>All
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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>Scalar Optimizations
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>richard-llvm@metafoo.co.uk
</td>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>Testcase:
#include <array>
static std::array<int, 1000> f() {
std::array<int, 1000> a = {};
for (int n = 0; n != 1000; ++n) a[n] = n*n*n;
return a;
}
int cube(int n) { return f()[n]; }
We should be able to optimize that to:
int cube(int n) { return n*n*n; }</pre>
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