Arm VERSION 1.2 Instrukcja Użytkownika Pobierz pdf (Strona 213)

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5.2.3 ADD and SUB, sp

Increment or decrement sp by an immediate constant.

Syntax

ADD sp, #expr

SUB sp, #expr

where:

expr

is an expression that evaluates (at assembly time) to a multiple of 4 in the

range –508 to +508.

Usage

This instruction adds the value of

expr

to the value from

, and places the result in

Note

ADD

instruction with a negative value for

expr

assembles to the corresponding

SUB

instruction with a positive constant. A

SUB

instruction with a negative value for

expr

assembles to the corresponding

ADD

instruction with a positive constant.

Be aware of this when looking at disassembly listings.

Condition flags

This instruction does not affect the flags.

Architectures

This instruction is available in all T variants of the ARM architecture.

Examples

ADD sp,#312

SUB sp,#96

SUB sp,#abc+8 ; abc + 8 must evaluate at assembly time to

; a multiple of 4 in the range –508 to +508

1 2 ... 208 209 210 211 212 213 214 215 216 217 218 ... 359 360

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Arm VERSION 1.2 Instrukcja Użytkownika Strona 213

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