https://www.intel.com/content/www/us/en/docs/onemkl/developer-reference-c/2023-0/cblas-rotg.html
cblas_?rotg
Computes the parameters for a Givens rotation.
cblasrotg
https://www.intel.com/content/www/us/en/docs/onemkl/developer-reference-fortran/2023-0/rotg.html
?rotg
Computes the parameters for a Givens rotation.
rotg