Answered: Consider the following C functions and…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Consider the following C functions and assembly code
Assume that long is 64 bits, int is 32 bits, short is 16 bits, and the
representation is two’s complement.
Assembly Code:

imulq %rsi, %rdi
imulq %rdx, %rsi
addq %rsi, %rdi
leaq (%rdi,%rdi,2), %rax
salq $3, %rax
ret

long functionA(long a, long b, long c){
long d = a*b;
long e = b*c;
return 18 * (d+e);
}

long functionB(long a, long b, long c){
long d = a*b;
long e = b*c;
return 24 * (d*e);
}

long functionC(long a, long b, long c){
long d = a*b;
long e = b*c;
return 24 * (d+e);
}

long functionD(long a, long b, long c){
long d = a*b;
long e = b*c;
return 32 * (d*e);
}

Which of the functions compiled into the assembly code shown?

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