On Fri, Apr 06, 2018 at 10:05:43AM +0200, Ludovic Courtès wrote: > Hello Eric, > > Eric Bavier <bav...@cray.com> skribis: > > > I recently discovered that the FFTW library can do runtime cpu > > detection. In order to do this, the package needs to be configured to > > build SIMD "codelets", like how our 'fftw-avx' currently does. Then, > > based on the instruction support detected at runtime, make those > > kernels available to the fftw "planner" for execution. > > That’s really good news! Thanks for testing it. > > The patch LGTM. Can you confirm that the planner won’t ever try to use > the AVX2 codelets, for instance when running the test suite on an x86_64 > box that lacks AVX2?
Yes, I've successfully run 'make check' on an sse2-only machine where '--enable-avx' and '--enable-avx2' where configured. I'll check on an i686 machine tonight. > If that’s the case, I’d be in favor of pushing this patch to core-updates. Great. I'll do some more testing. Should I send a finalized patch to guix-patches when it's ready? -- Eric Bavier, Scientific Libraries, Cray Inc.
