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

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