@martin-frbg ok thanks; do you know (historically) for the ?rotg? family? why it has been decided not to transpose back the packed-format-matrix i.e param ; that's the only weirdo which doesn't respect row-major storage. By any logical means cblas_?rotmg should have been declared as the following:

cblas_?rotmg(const enum CBLAS_ORDER order, type * d1, type * d2, type * b1, const type b2, type * param);

then param result transposed as it actually returns [ flag, h11, h21, h12, h22 ]; in row-major storage anyone would expect [ flag, h11, h12, h21, h22 ].