cross3_product vectorization

Charles Schlosserrequested to merge
chuckyschluz/eigen-chucky:eigen_cross into master

Reference issue

Fixes #2779 (closed)

What does this implement/fix?

Additional information

The changes to Eigen/src/Core/arch/AVX/TypeCasting.h were needed to fix compilation on MSVC, even if the function is not referenced. _mm256_set_m128d is a macro that tripped up the parser.

Edited by Charles Schlosser

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