Kernel Vectorization: branching is thread ID dependent ... cannot vectorize

Your code does not compile as it is due to missing definition for many of the functions. I believe it requires an external header. Please provide a code snippet that can be compiled (preferably using the code insertion mechanism provided in the forum so that indentation is preserved) so that we can take a look at the report and compiler messages. I fail to see why this cannot be vectorized, though; the statement in the condition does not depend on thread-ID, only its value does. You might be able to get around it using the (condition) ? (value1) : (value2) notation instead of if/else.