"Extended-and-quadruple-precision-in-Fortran-1"></span><h4 class="subsection">7.1.1 Extended and quadruple precision in Fortran</h4>
<span id="index-precision-7"></span>

<p>If FFTW is compiled in <code>long double</code> (extended) precision
(see <a href="Installation-and-Customization.html">Installation and Customization</a>), you may be able to call the
resulting <code>fftwl_</code> routines (see <a href="Precision.html">Precision</a>) from Fortran if
your compiler supports the <code>C_LONG_DOUBLE_COMPLE