I use this book ( Computer Systems: A Programmer\'s Perspective Authors: Randal

Question

I use this book (
Computer Systems: A Programmer's Perspective
Authors: Randal E. Bryant and David R. O'Hallaron
Publisher: Addison Wesley; 2
nd edition)

(in computer system language)

TQ.1] Assume the following values are stored in memory addresses and registers as indicated Value Address 0x100 0x104 0x108 0x10C 0x110 0x1C 0xBC OxFA 0x05 0x03 Register %rax %rcx %rax Value 0x104 0x001 Ox003 Fill in the following table showing the values of the given operand: Ox108 $0x104 %rcx (%rax) -8(%rax,%rcx,4) 4(%rax,%rdx,4) Q.2] Convert the following C codes to equivalent IA-64 assembly codes as per the GCC conventions.: a. If else if else int compare (int a, int *b, int c) { if (a> *b) return 1; else if (a

Explanation / Answer

1) 0x108 refers to the address at 0x108 i.e., 0xFA is the answer

$0x104 refers to the constant value that is 0x104 is the answer

%rcx refers to the actual value of the register %rcx that is 0x001 is the answer

(%rax) refers to the value at the address %rax that is 0x104 that is 0xBC is the answer

-8(%rax,%rcx,4) refers to the -8+%rax+%rcx*4= -8+0x104+0x001*4=0x100 is the answer

-4(%rax,rdx,4) refers to -4+%rax+%rdx*4=-4+0x104+0x003*4=0x112 is the answer

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