##### 9.10.2.4 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.