标签：des blog http io ar sp java strong on
逻辑指令集有：AND/ORR/EOR/BIC
1)与逻辑指令一般用于置零某位：AND
Logical AND operation.
| Syntax | AND{cond}{S} Rd, Rn, Op2 | |
| Description | Load Rd with logical AND of Rn with Op2. Rd := Rn AND Op2 | |
| Condition Flags | If S is specified, N, Z flags are updated. C flag may be updated by calculation of Op2. | |
| Example |
AND R9,R2,#0xFF00 // Load R9 with R2 and value in 0xFF00 |
2)逻辑或指令：ORR(或逻辑一般用于某位的置 1 )
Logical OR operation.
| Syntax | ORR{cond}{S} Rd, Rn, Op2 | |
| Description | OR operations on the values in Rn and Op2. | |
| Condition Flags | If S is specified, N, Z flags are updated. C flag may be updated by calculation of Op2. | |
| Example |
ORR R2, R0, R5 // Rd = R0 or R5 |
3）比较指令：CMP / CMN /TST / TEQ
标签：des blog http io ar sp java strong on
原文地址：http://blog.csdn.net/cj_kano/article/details/41828769
