ctbmv(3) on Linux
The text 64d43aca177f, 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-vector operations x := A*x, or x := A'*x, or x := conjg( A' )*x,