Load Effective Address: The load effective address instruction “leaq” is a variant of “movq” instruction. The instruction form reads memory to a register, but memory is not been referenced at all. The first operand of instruction is a memory reference; it copies effective address to destination. The pointers could be generated for later references of memory. The common arithmetic operations could be described compactly using this instruction. The operand in destination should be a register. Example: The example for a “leaq” instruction is shown below: leaq 6(%rdx, %rdx,3) Here, “%rdx” contains value of x. In given code, “%rdx” sets register “%rax” to “4x+6”.

Question

1. A. Convert the following C code into AT&T assembly: x at 8(%ebp) if (x>5){ X++; } else { X--; } while (x<10){ x++; } B. Annotate each line of the assembly code to describe how it operates. C. Write a goto version of the function (in C) that mimics how the assembly code program operates.

Answer 1

Question

Chapter 3.5, Problem 3.6PP

Program Plan Intro

Load Effective Address:

The load effective address instruction “leaq” is a variant of “movq” instruction.

The instruction form reads memory to a register, but memory is not been referenced at all.

The first operand of instruction is a memory reference; it copies effective address to destination.

The pointers could be generated for later references of memory.

The common arithmetic operations could be described compactly using this instruction.

The operand in destination should be a register.

Example:

The example for a “leaq” instruction is shown below:

leaq 6(%rdx, %rdx,3)

Here, “%rdx” contains value of x. In given code, “%rdx” sets register “%rax” to “4x+6”.

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