Professional Embedded ARM Development

Appendix E

Assembly Instructions

This appendix lists the different assembly instructions used on ARM cores, and what architecture each instruction introduced.

ARM INSTRUCTIONS

The following is a list of ARM-state instructions, separated into various categories.

Arithmetic Instructions

Arithmetic instructions do basic mathematical calculations: addition, subtraction, multiplication, and division. These instructions are listed in Table E-1, as well as the architecture in which they were introduced.

TABLE E-1: List of Arithmetic Instructions

Parallel Arithmetic

Parallel arithmetic instructions are instructions that work on two or more values packed into 32-bit data. Parallel arithmetic instructions use prefixes, listed in Table E-2.

TABLE E-2: Parallel Arithmetic Prefixes

PREFIX	FUNCTION
S	Signed arithmetic modulo 28 or 216. Sets APSR GE flags
Q	Signed saturating arithmetic
SH	Signed arithmetic, halving the results
U	Unsigned arithmetic modulo 28 or 216. Sets APSR GE flags
UQ	Unsigned saturating arithmetic
UH	Unsigned arithmetic, halving the results

Table E-3 lists parallel arithmetic instructions, their usage, and their effect.

TABLE E-3: Parallel Arithmetic Instructions ...