title: Return float st(0) or xmm0
body: <p>Directive for determining in which register (<code>st(0)</code> or <code>xmm0</code>) the floating point value from the assembler block in C++ code will be returned.</p>
  <pre><code>__declspec(naked) float __fastcall ln(float flt)
  {
      float buf;
  
      _asm {
          mov buf, eax
          fld buf             // Return st(0)
      };
  };
  </code></pre>