div.asm

来自「A few drivers for the Motorola C380 s ce」· 汇编 代码 · 共 32 行

                AREA CodeStart, CODE, READONLY, ALIGN=4
     
                CODE16
                
__rt_udiv       ;In: R0 - divisor, R1 - dividable
                ;Out: R0 - div, R1 - mod
                MOV     R2, #0
                LSL     R0, R0, #0xF
                MOV     R3, #0x10
next_bit
                LSL     R2, R2, #1
                CMP     R1, R0
                BCC     no_sub
                SUB     R1, R0
                ADD     R2, R2, #1
no_sub
                LSR     R0, R0, #1
                SUB     R3, R3, #1
                BNE     next_bit
                MOV     R0, R2
                BX      LR

__rt_udiv10
                MOV     R1, R0
                MOV     R0, #10
                B       __rt_udiv
                 
                EXPORT __rt_udiv
                EXPORT __rt_udiv10
                
                END