Avoid conflicts with Intel Short Vector Math Library
Submitted by Gael Guennebaud @ggael
Assigned to Nobody
Link to original bugzilla bug (#1259)
Version: 3.4 (development)
Platform: x86 - general
Description
Recent Intel's compiler are able to automatically vectorize math functions such as cos, exp, etc. through calls to SVML. Apparently, SVML versions are faster than ours, and therefore disabling Eigen's vectorization might lead to faster code...
One possible strategy would be to perform ourself explicit calls to SVML in our pexp, p* functions when the user compiles with -DEIGEN_USE_SVML.