arm 汇编技巧

1. 汇编标号：f表示forward， b表示backward：

Here is an example:

1: branch 1f

2: branch 1b

1: branch 2f

2: branch 1b

Which is the equivalent of:

label_1: branch label_3

label_2: branch label_1

label_3: branch label_4

label_4: branch label_3

The "post-indexed" forms mean that the memory address is the base register value, then base plus

offset is written back to the base register.

先用base，再base= base+offset

• The "pre-indexed" forms mean that the memory address is the base register value plus offset, then the

computed address is written back to the base register.

先base= base+offset， 再用base