On Wed, Mar 23, 2011 at 3:21 PM, Sylvestre Ledru <[email protected]>wrote:
> Le mercredi 23 mars 2011 à 14:52 +0100, Carsten Aulbert a écrit : > Hi > > > > we are just discussing FFTW in our institute and we hit this bug reported > to > > Ubuntu which also holds true for Debian: > > > > https://bugs.launchpad.net/ubuntu/+source/fftw3/+bug/602586 > > > > Is there a specific reason why SSE is enabled for 32bit and not enabled > for > > 64bit as the difference in performance can easily be a factor of 2 (on > 64bit). > This bug is invalid. SSE is enabled by default under amd64 [1] > > Sylvestre > [1] http://gcc.gnu.org/onlinedocs/gcc/i386-and-x86_002d64-Options.html > `sse' > [...] > "This is the default choice for the x86-64 compiler." > > but it will not define HAVE_SSE in config.h so the fftw3 might not use some handcrafted functions.
