<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 - LoopStrengthReduce generates incorrect IR"
   href="https://bugs.llvm.org/show_bug.cgi?id=32289">32289</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>LoopStrengthReduce generates incorrect IR
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>new-bugs
          </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>new bugs
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>anna@azul.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=18100" name="attach_18100" title="Original IR">attachment 18100</a> <a href="attachment.cgi?id=18100&action=edit" title="Original IR">[details]</a></span>
Original IR

Steps to reproduce (on trunk):
opt -loop-reduce test2.ll -S > test2_lsr.ll 

Source code snippet:
vMeth1(long longarg, int intarg) {

        int ivar, jvar;
        boolean bArr[]=new boolean[N];

        ivar = 1;

        do {
            intarg += (((ivar * ivar) + intarg) - Test.instanceCount);
            bArr[ivar] = (((Test.dFld - Test.instanceCount) /
(((long)(-(Test.fFld
* Test.instanceCount))) | 1)) !=
                    (--intarg));
            Test.iArrFld[ivar] = (int)(intarg *= (int)longarg);
            longarg += (++Test.iArrFld[ivar]);
        } while (++ivar < 98);

        jvar = 68;

        while (--jvar > 0) {
            intarg += (int)(intarg -= (int)(-(++Test.fFld)));
            try {
                intarg = (Test.iArrFld[jvar - 1] % -82);
            } catch (ArithmeticException a_e) {}

        }

        sum += longarg + ivar + jvar;
}
This is in effect: sum += longarg + 98 + 0. 

Both the loops above are transformed through LSR. When LSR is enabled, the
longarg value for the sum is calculated incorrectly.

I have attached the original and transformed IR, along with detailed comments
on how the value is calculated (and where the difference occurs).
The result (sum) is calculated in the `ResultBB`.</pre>
        </div>
      </p>


      <hr>
      <span>You are receiving this mail because:</span>

      <ul>
          <li>You are on the CC list for the bug.</li>
      </ul>
    </body>
</html>