<html>
    <head>
      <base href="https://bugs.llvm.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <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>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>std::gcd and std::lcm doesn't precalculate in compile-time
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>clang
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>trunk
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </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>

        <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>
        </div>
      </p>


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