as supports the full range of guarded execution
directives for each instruction. Just append the directive after the
instruction proper. The directives are:
Execute the instruction if flag f0 is true.
Execute the instruction if flag f0 is false.
Execute the instruction if flag f1 is true.
Execute the instruction if flag f1 is false.
Execute the instruction if both flags f0 and f1 are true.
Execute the instruction if flag f0 is true and flag f1 is false.