Examples

   1.$is_32bits  R9, 10$

     In this example, the compiler checks the sign extension of
     the low 32 bits of the 64-bit value at R9 using the default
     temporary register, R22. Depending on the type of branch
     and the outcome of the test, the program either branches or
     continues in line.

   2.$is_32bits  4(R8), 20$, 30$, R28

     In this example, the compiler checks the sign extension of
     the low 32 bits of the 64-bit value at 4(R8) using R28 as a
     temporary register and, based on the check, branches to either
     20$ or 30$.