New hardware architecture use vector operations and parallelism for high speed computation; existing software has mostly to be rewritten. The automation of the adaptation of existing software to the new hardware is unsatisfactory, especially when using high level languages, as the vectorisation and parallelisation process needs a knowledge of the hardware, of convenient transformations and of semantic properties of the program to take advantage of the hardware possibilities. The expert system SAVER will be the basis to accelerate and automate thoroughly the vectorisation process. The most interesting features of the Saver system will be presented in this paper.