SPARC Assembly/Control Flow

Comparison cmp compares two numbers (Subtraction). Sets flags. tst tests two numbers (performs 'and' operation). Sets flags. Jump Instructions jmp jumps to specified indirect address. stores return address in %o7. jmpl Performs an unconditional, register indirect jump. Target address is provided in the first operand, and the return address is then stored into the rd operand. jmpl rs1, rd If the return address is stored in %o7, this acts like a subroutine call. If the return address is stored in %g0, it acts like a subroutine return. sethi Sets the highest 22 bits of the target register, sets the lowest 10 bits to zero. sethi const22, rd const22 must be a constant value, cannot be a register. Subroutine Instructions call calls a subroutine. Takes a single label as a new target address. Stores the return address in %o7. cannot jump to a register indirect address. ret return from a subroutine. retl return from a leaf subroutine. rett Return from a trap instruction, or from a register indirect control transfer. save saves the current register window and creates a new window. raises an exception if there is a register window overflow. restore restores a saved register window. Branch Instructions branches do not store the return address. ba Branch always. an unconditional jump to the target location. d bn Branch never. be bne branches if the two operands are equal or not equal, respectively. bl branches on "less than" ble branches on "less than or equal" bge branches on "greater than or equal" bg branches on "greater than" blu bleu Same as bl and ble, except uses unsigned numbers bgeu bgu Same as bge and bg, except uses unsigned numbers bpos branches if the number is positive. bneg branches if the number is negative. bcs bcc branches if the carry bit is set or clear, respectively. bvs bvc branches if the signed overflow bit is set or clear, respectively.