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    <head>
      <base href="http://llvm.org/bugs/" />
    </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 --- - FMA4 not generated for piledriver (bdver2) target?"
   href="http://llvm.org/bugs/show_bug.cgi?id=17235">17235</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>FMA4 not generated for piledriver (bdver2) target?
          </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>All
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </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>kkhoo@perfwizard.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvmbugs@cs.uiuc.edu
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>The following FMA function could have used an FMA4 instruction ("vfmaddsd") on
a target that supports FMA4; this should avoid the extra move operation:

$ ./clang -v
clang version 3.4 (trunk 189776)
Target: x86_64-apple-darwin11.4.2
Thread model: posix

$ cat fma2.c 
#pragma STDC FP_CONTRACT ON
double foo(double x, double y, double z) {
    return y*z + x;
}

$ ./clang -S -O3 -fomit-frame-pointer -march=bdver2 -o /dev/stdout fma2.c 
    .section    __TEXT,__text,regular,pure_instructions
    .globl    _foo
    .align    4, 0x90
_foo:                                   ## @foo
    .cfi_startproc
## BB#0:                                ## %entry
    vfmadd213sd    %xmm0, %xmm2, %xmm1
    vmovaps    %xmm1, %xmm0
    ret
    .cfi_e</pre>
        </div>
      </p>
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