Firas Abbas wrote:
Hi,
On Sat, 5/2/09, Andrew Lutomirski <l...@mit.edu> wrote:
I can speculate: some versions of Ubuntu (i.e. all the ones
I've actually looked at) seem to build fftw *without* SSE/SSE2.
--Andy
Do FFTW have a function we can use to read if it is using SSE/SSE2?. If exist,
we can add a small program to gnuradio to warn about the missing of it.
I think there is a function for that, but since I couldn't remember it,
I went to fftw.org and I found this:
"SSE, AltiVec, and MIPS PS only work with |--enable-float| (above),
while SSE2 only works in double precision (the default). The resulting
code will /still work/ on earlier CPUs lacking the SIMD extensions (SIMD
is automatically disabled, although the FFTW library is still larger)."
The default fftw is using double precision, but I have a feeling that
the build- wiki for gnuradio sugested single- precision...
//Mattias
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