The ST200 is a family of very long instruction word (VLIW) processor cores based on technology jointly developed by Hewlett-Packard Laboratories and STMicroelectronics under the name Lx.
The principal architects for the ST200 Lx implementation [1] were Paolo Faraboschi (HPL, architecture) and Fred Homewood (STM, microarchitecture).
The architecture was really a true cross company development, co-sited for the early duration of the project, lasting some two years.
The differences among these cores are minimal: In digital video, STM reported in 2009 that it had shipped over 40 million systems-on-chip (SoCs) containing a VLIW processor from the ST200 family.
In these compilers, the Open64 release has been improved by upgrading its GCC C and C++ front-end from 2.96 to 3.x and later 4.x, in order to achieve full C++ compliance.