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Message: [QUOTE="Billy Mays, post: 4214487"] On the GPU I am using, threads execute simultaneously as long as they all execute the exact same instructions (ie, they all take the branch). If one of the threads takes a different execution path, then each thread has to run in serial which means the parallel speed gain is lost. It would be cheaper to evaluate the whole expression rather than short-circuit since it would mean that all the threads could take the same path. For example, if(a && b && c) { /* Do stuff */ } Thread 1: a = 1, b = 2, c = 0 Thread 2: a = 0, b = 1, c = 2 Neither thread will execute the body of the if statement, but Thread 2 would branch away while Thread 1 would still be evaluating b and c. [/QUOTE]