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    <body><span class="vcard"><a class="email" href="mailto:fabian+debian@greffrath.com" title="Fabian Greffrath <fabian+debian@greffrath.com>"> <span class="fn">Fabian Greffrath</span></a>
</span> changed
              <a class="bz_bug_link 
          bz_status_ASSIGNED "
   title="ASSIGNED - libavcodec/h264_cabac.c fails to compile with --cpu=i586"
   href="https://bugzilla.libav.org/show_bug.cgi?id=850">bug 850</a>
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          <tr>
            <th>What</th>
            <th>Removed</th>
            <th>Added</th>
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           <td style="text-align:right;">CC</td>
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           </td>
           <td>fabian+debian@greffrath.com
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            <b><a class="bz_bug_link 
          bz_status_ASSIGNED "
   title="ASSIGNED - libavcodec/h264_cabac.c fails to compile with --cpu=i586"
   href="https://bugzilla.libav.org/show_bug.cgi?id=850#c2">Comment # 2</a>
              on <a class="bz_bug_link 
          bz_status_ASSIGNED "
   title="ASSIGNED - libavcodec/h264_cabac.c fails to compile with --cpu=i586"
   href="https://bugzilla.libav.org/show_bug.cgi?id=850">bug 850</a>
              from <span class="vcard"><a class="email" href="mailto:fabian+debian@greffrath.com" title="Fabian Greffrath <fabian+debian@greffrath.com>"> <span class="fn">Fabian Greffrath</span></a>
</span></b>
        <pre>This is from
<a href="http://stackoverflow.com/questions/25579759/gcc-inline-assembly-what-does-asm-operand-has-impossible-constraints-mean">http://stackoverflow.com/questions/25579759/gcc-inline-assembly-what-does-asm-operand-has-impossible-constraints-mean</a>

Using the "r" constraint forces the compiler to load the parameter into a
scratch register before using that scratch register for one of your mov
instructions. There simply aren't [that many] scratch registers available.

Use the "g" constraint instead. This is more effiecient anyway, since the
compiler will be able to access the argument directly in your mov instructions
using a frame pointer offsetted memory access onto the destination register
instead of doing that into a scratch register then moving the scratch register
into the ultimate destination.

Hope that helps.</pre>
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