<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 - Add scheduler classes for integer/float horizontal operations"
   href="https://bugs.llvm.org/show_bug.cgi?id=32801">32801</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Add scheduler classes for integer/float horizontal operations
          </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>Windows NT
          </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>Backend: X86
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>llvm-dev@redking.me.uk
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>andrew.v.tischenko@gmail.com, llvm-bugs@lists.llvm.org, spatel+llvm@rotateright.com
          </td>
        </tr>

        <tr>
          <th>Blocks</th>
          <td>26859, 32325
          </td>
        </tr></table>
      <p>
        <div>
        <pre>The integer/float horizontal operations (PHADD, PHSUBD, HADDPS etc.) often have
very different latency/throughput characteristics to basic 'in-element'
arithmetic instructions.

They need separating from the existing classes and grouped into their own
integer/float classes to allow better scheduling (<a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [META][X86] Improve implementation and use of X86 scheduler models"
   href="show_bug.cgi?id=32325">Bug #32325</a>) and MC
optimization (<a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [x86, SSE] only use phaddw / phaddd when optimizing for minsize?"
   href="show_bug.cgi?id=26859">Bug #26859</a>).</pre>
        </div>
      </p>

        <div id="referenced">
          <hr style="border: 1px dashed #969696">
          <b>Referenced Bugs:</b>
          <ul>
              <li>
                [<a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [x86, SSE] only use phaddw / phaddd when optimizing for minsize?"
   href="https://bugs.llvm.org/show_bug.cgi?id=26859">Bug 26859</a>] [x86, SSE] only use phaddw / phaddd when optimizing for minsize?
              </li>
              <li>
                [<a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [META][X86] Improve implementation and use of X86 scheduler models"
   href="https://bugs.llvm.org/show_bug.cgi?id=32325">Bug 32325</a>] [META][X86] Improve implementation and use of X86 scheduler models
              </li>
          </ul>
        </div>
        <br>

      <hr>
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