 of worse
performance; for multi-dimensional c2r transforms, however, no
input-preserving algorithms are implemented and the planner will return
<code>NULL</code> if one is requested.
<a name="index-c2r-1"></a>
<a name="index-hc2r-1"></a>

</li><li> <a name="index-FFTW_005fUNALIGNED"></a>
<a name="index-alignment-1"></a>
<a name="index-fftw_005fmalloc-4"></a>
<a name="index-fftw_005falignment_005fof"></a>
<code>FFTW_UNALIGNED</code> specifies that the algorithm may not impose any
unusual alignment requireme