This bug was fixed in the package fftw3 - 3.2.2-1ubuntu1
---
fftw3 (3.2.2-1ubuntu1) oneiric; urgency=low
* Rebuild with gfortran-4.6.
* Configure with --enable-sse --enable-sse2 on amd64. LP: #602586.
-- Matthias Klose d...@ubuntu.com Sat, 10 Sep 2011 11:19:17 +0200
**
I'm one of the FFTW developers, and I can confirm that the SSE/SSE2 code
is NOT compiled in FFTW if the --enable-sse/--enable-sse2 flags (in
single/double precision) are omitted. You should definitely pass these
flags to the configure script on x86-64 systems.
--
You received this bug
One other comment: it is save to use these flags on i386 - the resulting
FFTW binary still works on machines not supporting SSE/SSE2, because it
checks at runtime to see if SSE/SSE2 is available and disables FFTW's
SSE/SSE2 routines if not.
See also http://fftw.org/doc/Installation-on-Unix.html
Yes it is correct that for amd64 SSE is enabled by default in the
compiler. But (if I'm not wrong) the FFTW --enable-sse flag does not
(only) set compiler flags. Instead it activates the specially written
SSE optimized kernels are compiled. Because the --enable-sse flag is not
passed, those
Two comments:
* This is wrong for i386 (at least under Debian): we should not restrict users
to SSE or SSE2.
* About amd64, this bug is invalid (at least for the SSE). SSE is enabled by
default under amd64 [1]
http://gcc.gnu.org/onlinedocs/gcc/i386-and-x86_002d64-Options.html
`sse'
[...]
This is
