Hi I have foujnd the reason for the weird behavior of gcc when reading 64 bits data.
I found out how to avoid this. The performance of the generated code doubled. I thank everyone in this forum for their silence to my repeated help requests. They remind me that: THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. Jacob
