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Since the system call causes an exception , any boosted instructions in the same basic block must be reexecuted after the next branch ( if the branch follows the predicted path ) . I look at this time in class ( about 5 to 10minutes ) as a chance to reinforce the material we covered yesterday . But that is easily changed : by hitting o ( for Options ) at the main elm screen , you can instruct the program to change that to pico , ce or some other editor with which you might be more comfortable . The problem with this line of thought ( besides being empirically unproven ) is that it too quickly allows the ends to justify the means .