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【汇编指令】数据处理指令之算术指令集

ARM指令集:

其中包括数据处理指令集

1)算术指令(ADD,ADC,SUB,SBC , RSB, RSC )

①加法指令:ADD,ADDS

其中带S的表示可以更新标志位

ADD/ADDS

Add values and store result to register.

Syntax ADD{cond}{S}  Rd, Rn, Op2
Description Add Rn and Op2 and store result to Rd.
Condition Flags If S is specified update flags: N, Z, C, V.
Example 
       ADDS  R0,R2,R4          //Add R2 and R4 and store result to R0, update flags
       ADD   R4,R4,#0xFF00     //Add value in 0xFF00 and R4 and store result in R4
<script src="https://code.csdn.net/snippets/547166.js" type="text/javascript"></script>



②带进位的加法指令:ADC/ADDS

ADC

Add with Carry.

Syntax ADC{cond}{S}  Rd, Rn, Op2
Description Add Rn and Op2 and Carry flag and store result to Rd. ADC is typical used for multi-word arithmetic.
Condition Flags If S is specified update flags: N, Z, C, V.
Example 
ADDS  R0,R2,R4       // add R2 + R4, store result to R0, set flags
ADC   R1,R3,R5       // add R3 + R5 with carry from previous ADDS, store result to R1

<script src="https://code.csdn.net/snippets/547193.js" type="text/javascript"></script>


③反向减法指令;RSB/RSC

     rsb r0, r0, #100                ;r0 = 100 - r0;表示把100减去R0的值存入r0中





【汇编指令】数据处理指令之算术指令集