<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 - Failure to optimize away multiplication when right operand is not 0"
   href="https://bugs.llvm.org/show_bug.cgi?id=45685">45685</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Failure to optimize away multiplication when right operand is not 0
          </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>

        <tr>
          <th>Component</th>
          <td>Scalar Optimizations
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>gabravier@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>int f(int a, int b, int c)
{
    __builtin_assume(c != 0);
    a *= c;
    b *= c;
    return a == b;
}

This could all be optimized into `a == b` since `c != 0`. This transformation
is done by GCC, but not by LLVM.

Comparison here : <a href="https://godbolt.org/z/SMWp9P">https://godbolt.org/z/SMWp9P</a></pre>
        </div>
      </p>


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