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it allows the possiblity to save some compilation time by linking to it
*and* defining the token EIGEN_EXTERN_INSTANCIATIONS
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* bugfix in Assign and cache friendly product (weird that worked before)
* improved argument evaluation in Product
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(does not support complex and does not re-use the QR decomposition)
* Rewrite the cache friendly product to have only one instance per scalar type !
This significantly speeds up compilation time and reduces executable size.
The current drawback is that some trivial expressions might be
evaluated like conjugate or negate.
* Renamed "cache optimal" to "cache friendly"
* Added the ability to directly access matrix data of some expressions via:
- the stride()/_stride() methods
- DirectAccessBit flag (replace ReferencableBit)
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Gael Guennebaud