Go to a subroutine at program line LLLL if X contains a number less than nn.
Dialect exclusions: Not available in dialects before 10.
Note: Does not pop X
See also GoSubIfXEQ, GoSubIfXGE, GoSubIfXGT, GoSubIfXLE, GoSubIfXNE
GoSubIfXEQ
GoSubIfXGE
GoSubIfXGT
GoSubIfXLE
GoSubIfXNE