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syr2k: Symmetric Rank-2K Update

General form of the operation:

C := α ( A B^T + B A^T ) + β C

or

C := α ( A^T B + B^T A ) + β C

where C is symmetric,
stored in only the upper or lower triangular part of C

C :

Special structure:	symmetric
Stored in:

α:

value:

A:

Special structure:	none
Transpose?

B:

Special structure:

none

β:

value: