Arm VERSION 1.2 Bedienungsanleitung PDF herunterladen (Seite 210)

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Thumb Instruction Reference

5.2.1 ADD and SUB, low registers

Add and subtract. There are three forms of these instructions that operate on low

registers. You can:

• add or subtract the contents of two registers, and place the result in a third register

• add a small integer to, or subtract it from, the value in a register, and place the

result in a different register

• add a larger integer to, or subtract it from, the value in a register, and return the

result to the same register.

Syntax

op Rd, Rn, Rm

op Rd, Rn, #expr3

op Rd, #expr8

where:

is either

ADD

SUB

is the destination register. It is also used for the first operand in

Rd,#expr8

instructions.

is a register containing the first operand.

is a register containing the second operand.

expr3

is an expression evaluating (at assembly time) to an integer in the range

–7 to +7.

expr8

is an expression evaluating (at assembly time) to an integer in the range

–255 to +255.

Usage

op Rd,Rn,Rm

performs an

or an

–

operation, and places the result in

op Rd,Rn,#expr3

performs an

expr3

or an

–

expr3

operation, and places the result

op Rd,#expr8

performs an

expr8

or an

–

expr8

operation, and places the result in

1 2 ... 205 206 207 208 209 210 211 212 213 214 215 ... 359 360

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