`ccc' is the Compaq C compiler for Linux Alpha.  It is a port of the same
compiler that is available on the Compaq Tru64 UNIX platform (and also on
OpenVMS Alpha).  The compiler produces excellent optimized code for the
Alpha architecture, particularly for floating-point intensive applications. 

See the on-line usage docs at
ftp://ftp.compaq.com/pub/products/C-CXX/linux/compaq_c_v62/docs/ccc/readme.htm

WWW:  http://h30097.www3.hp.com/dtk/compaqc_ov.html