ssyr(3) on Linux
The text 97d61b453afe, 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 the symmetric rank 1 operation A := alpha*x*x' + A,
The text 97d61b453afe, 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 the symmetric rank 1 operation A := alpha*x*x' + A,