<html>
    <head>
      <base href="https://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 --- - function-level attribute leakage"
   href="https://llvm.org/bugs/show_bug.cgi?id=23172">23172</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>function-level attribute leakage
          </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>Common Code Generator Code
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>spatel+llvm@rotateright.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>$ cat fast-attribute.ll 

define double @add_0_fast(double %a) #0 {
  %add = fadd double %a, 0.0
  ret double %add
}


define double @add_0_not_fast(double %a) {
  %add = fadd double %a, 0.0
  ret double %add
}

attributes #0 = { "unsafe-fp-math"="true" }

----------------------------------------------------------------------

The 2nd function should have an add instruction, but:

$ ./llc -o - fast-attribute.ll 
_add_0_fast:                            ## @add_0_fast
    retq
_add_0_not_fast:                        ## @add_0_not_fast
    retq</pre>
        </div>
      </p>
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