count_iter_20.sa

dsp6713开发板的许多例程.对入门特别有用

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

        ZERO    iters               ; Initialize our return value to 0.

        SUB     count,  1,  i       ; i = count - 1;
        BDEC    loop,   i           ; Do not iterate if count < 1.

does_not_iterate:
        .return iters               ; Loop does not iterate, just return 0.

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

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


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