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Lecture 8: ARM Arithmetic and Bitweise Instructions

Lecture 8: ARM Arithmetic and Bitweise Instructions CSE 30: Computer Organization and Systems Programming Winter 2014. Diba Mirza Dept. of Computer Science and Engineering University of California, San Diego Basic Types of ARM Instructions 1. Arithmetic : Only processor and registers involved 1. compute the sum (or difference) of two registers, store the result in a register 2. move the contents of one register to another 2. Data Transfer Instructions : Interacts with memory 1. load a word from memory into a register 2. store the contents of a register into a memory word 3. Control Transfer Instructions : Change flow of execution 1. jump to another instruction 2. conditional jump ( , branch if registeri == 0). 3. jump to a subroutine ARM Addition and Subtraction Syntax of Instructions : 1 2, 3, 4. where: 1) instruction by name 2) operand getting result ( destination ). 3) 1st operand for operation ( source1 ). 4) 2nd operand for operation ( source2 ).

lecture) " ADD r3, r0, r1, LSL#2; r3=r0+ r1<<2 . What is a likely range for immediates in the immediate addressing mode A. 0 to (232-1) ... mask last 12 bits! 25. Uses for Logical Operators " Similarly, note that ORing a bit with 1 produces a 1 at the output while ORing a bit

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