 call fftw_execute(plan)
</pre></div>
<span id="index-fftw_005fexecute-6"></span>

<p>However, we have had reports that this causes problems with some
recent optimizing Fortran compilers.  The problem is, because the
input/output arrays are not passed as explicit arguments to
<code>fftw_execute</code>, the semantics of Fortran (unlike C) allow the
compiler to assume that the input/output arrays are not changed by
<code>fftw_execute</code>.  As a consequence, certain compilers end up
repositioning the call t