On Tue, 11 Apr 2017, Yifei wrote:
> I'm wondering why gcc fails to do a straightforward optimization? And how can
> I do, as a work around, to avoid writing an explicit loop?
(note, the example is vectorized with -mveclibabi={acml,svml}, but then it
requires the corresponding external library and -ffast-math)
Without -mveclibabi, this works for loop vectorization with recent Glibc,
because it provides vectorized implementations in libmvec and has
__attribute__((simd)) on a few math functions.
However, using SIMD clones in SLP vectorization is currently not implemented
(veclib calls and SIMD clones are handled via different paths)
Alexander
