Arm VERSION 1.2 Instrukcja Użytkownika Pobierz pdf (Strona 215)

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5.2.5 ADC, SBC, and MUL

Add with carry, Subtract with carry, and Multiply.

Syntax

op Rd, Rm

where:

is one of

ADC

SBC

, or

MUL

is the destination register. It also contains the first operand.

is a register containing the second operand.

Usage

ADC

adds the values in

and

, together with the carry flag, and places the result in

Use this to synthesize multiword addition.

SBC

subtracts the value in

from the value in

, taking account of the carry flag, and

places the result in

. Use this to synthesize multiword subtraction.

MUL

multiplies the values in

and

, and places the result in

Restrictions

, and

, must be low registers (that is, in the range r0 to r7).

Condition flags

ADC

and

SBC

update the N, Z, C, and V flags.

MUL

updates the N and Z flags.

In ARM architecture version 4 and earlier,

MUL

corrupts the C and V flags. In ARM

architecture version 5 and later,

MUL

has no effect on the C and V flags.

Architectures

These instructions are available in all T variants of the ARM architecture.

Example

ADC r2,r4

1 2 ... 210 211 212 213 214 215 216 217 218 219 220 ... 359 360

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