zgemm(3) on Linux
The text 1244f689c3a2, as Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny), Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it.
perform one of the matrix-matrix operations C := alpha*op( A )*op( B ) + beta*C,