On Fri, Oct 14, 2011 at 10:19:01PM -0500, Pavan Balaji wrote:

Aren't all combinations allowed?

Yes, but rules 2+3 specify some additional semantics for those cases (e.g., that the outcome is "stable" and has to represent the written data at least on a per-byte granularity) while all other undefined cases may put random data into the accessed locations. Torsten -- bash$ :(){ :|:&};: --------------------- http://www.unixer.de/ ----- Torsten Hoefler | Performance Modeling and Simulation Lead Blue Waters Directorate | University of Illinois (UIUC) 1205 W Clark Street | Urbana, IL, 61801 NCSA Building | +01 (217) 244-7736