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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 - Clang misses an opportunity to evaluate a call to std::accumulate at compile time"
href="https://bugs.llvm.org/show_bug.cgi?id=34254">34254</a>
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<th>Summary</th>
<td>Clang misses an opportunity to evaluate a call to std::accumulate at compile time
</td>
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<th>Product</th>
<td>clang
</td>
</tr>
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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
</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>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>jbcoe@me.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>The following code:
#include <iterator>
#include <numeric>
using std::begin;
using std::end;
int f()
{
int xs[32];
std::iota(begin(xs),
end(xs), 1);
return std::accumulate(begin(xs),
end(xs), 0);
}
Is compiled with gcc-trunk -O3 to:
f():
mov eax, 528
ret
whereas Clang evaluates the call to accumulate at compile time.
example at: <a href="https://godbolt.org/g/dd831y">https://godbolt.org/g/dd831y</a>
This is not impeding my work in any way and was discovered by accident.</pre>
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