##### 9.9.2.4 Guarded Execution

`as` supports the full range of guarded execution directives for each instruction. Just append the directive after the instruction proper. The directives are:

``/tx`'
  Execute the instruction if flag f0 is true.
``/fx`'
  Execute the instruction if flag f0 is false.
``/xt`'
  Execute the instruction if flag f1 is true.
``/xf`'
  Execute the instruction if flag f1 is false.
``/tt`'
  Execute the instruction if both flags f0 and f1 are true.
``/tf`'
  Execute the instruction if flag f0 is true and flag f1 is false.