Your task is to fill in the missing parts of the C code to get a program equivalent to the generated assembly code. Recall that the result of the function is returned in register %rax. You will find it helpful to examine the assembly code before, during, and after the loop to form a consistent mapping between the registers and the program variables. A. Which registers hold program values x, n, result, and mask? B. What are the initial values of result and mask? C. What is the test condition for mask? D. How does mask get updated? E. How does result get updated?

Your task is to fill in the missing parts of the C code to get a program equivalent to the generated assembly code. Recall that the result of the function is returned in register %rax. You will find it helpful to examine the assembly code before, during, and after the loop to form a consistent mapping between the registers and the program variables. A. Which registers hold program values x, n, result, and mask? B. What are the initial values of result and mask? C. What is the test condition for mask? D. How does mask get updated? E. How does result get updated?

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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Concept explainers

Computer Fundamentals

The computer is termed computation. For calculating or computing something the device that has been used is known as the computer. Or we can say that for performing a fast arithmetic operation the device that has been used is a computer. Storing, processing, and retrieving are the main features of a computer. 

Question

long loop(long x, long n)
{
1
long result =
long mask;
for (mask
4
; mask
; mask =
) {
result |=
7
}
8
return result;
9.
}
Your task is to fill in the missing parts of the C code to get a program equivalent
to the generated assembly code. Recall that the result of the function is returned
in register %rax. You will find it helpful to examine the assembly code before,
during, and after the loop to form a consistent mapping between the registers and
the program variables.
A. Which registers hold program values x, n, result, and mask?
B. What are the initial values of result and mask?
C. What is the test condition for mask?
D. How does mask get updated?
E. How does result get updated?
F. Fill in all the missing parts of the C code.
2.
3.
6

Consider the following assembly code:
long loop(long x, int n)
x in %rdi, n in %esi
1
loop:
%esi, %ecx
$1, %edx
$0, %eax
2
movl
3
movl
4
movl
jmp
.L2
6.
.L3:
%rdi, %r8
%rdx, %r8
%r8, %rax
%с1, %rdx
7
movq
8
andq
orq
10
salq
11
.L2:
12
testq
%rdx, %rdx
13
jne
.L3
14
rep; ret
The preceding code was generated by compiling C code that had the following
overall form:

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