count_iter_21.sa

来自「dsp6713开发板的许多例程.对入门特别有用」· SA 代码 · 共 18 行

        .global _count_loop_iterations
_count_loop_iterations .cproc count
        .reg    i, iters

        MVK     -1,     iters       ; Loop executes exactly 1 extra iteration,
                                    ; so start with the iteration count == -1.

        SUB     count,  1,  i       ; Force "count==0" to iterate exactly once.

loop:   .trip   1                   ; This loop is guaranteed to iterate at 
                                    ; least once.

        ADD     iters,  1,  iters   ; iters++
        BDEC    loop,   i           ; while (i-- >= 0);

        .return iters               ; Return our number of iterations.
        .endproc