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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 - std::gcd and std::lcm doesn't precalculate in compile-time"
href="https://bugs.llvm.org/show_bug.cgi?id=35711">35711</a>
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<th>Summary</th>
<td>std::gcd and std::lcm doesn't precalculate in compile-time
</td>
</tr>
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<th>Product</th>
<td>clang
</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>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>LLVM Codegen
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>zamazan4ik@tut.by
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>clang (trunk) with '-O3 -std=c++17' for this code:
#include <numeric>
unsigned test()
{
return std::gcd(2,4);
}
generates this:
test(): # @test()
mov edx, 4
mov eax, 2
.LBB0_1: # =>This Inner Loop Header: Depth=1
mov ecx, edx
cdq
idiv ecx
mov eax, ecx
test edx, edx
jne .LBB0_1
mov eax, ecx
neg eax
cmovl eax, ecx
ret
gcc (trunk) with '-O3 -std=c++17':
test():
mov eax, 2
ret
Similar issue fot std::lcm (GCC also calculate it in compile-time).</pre>
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