is we employ the
hardware <em>cycle counters</em> that are available on most CPUs.
Currently, FFTW supports the cycle counters on x86, PowerPC/POWER, Alpha,
UltraSPARC (SPARC v9), IA64, PA-RISC, and MIPS processors.
</p>
<a name="index-compiler-3"></a>
<p>Access to the cycle counters, unfortunately, is a compiler and/or
operating-system dependent task, often requiring inline assembly
language, and it may be that your compiler is not supported.  If you are
<em>not</em> supported, FFTW will by default fall ba