Computer Systems Organization
Midterm Exam Spring 2015
(60 minutes)
代写计算机系统组织 Questions vary in difficulty; it is strongly recommended that you do not spend too much time on any one question.
Notes: 代写计算机系统组织
- If you perceive any ambiguity in any of the questions, state your assumptions clearly
- Questions vary in difficulty; it is strongly recommended that you do not spend too much time on any one question.
- This exam is open book/notes.
1.(5 points) Circle the correct answer among the choices given. If you circle more than one answer, you will lose the grade of the corresponding question.
(A) If you distribute your program among 10 C files, the compiler will generate:
1.10 assembly files
2.10 object code files
3.1 big assembly file
4.1 big object code file
(B) If there is an array declaration: int x[10], then x[0] will be stored at a memory address lower than x[5] (i.e. if x[0] is in memory address 100 for example, then x[5] must be after 100) 代写计算机系统组织
1.True
2.False
3.correct only for big endian machines
4.correct only for little endian machine
(C) Presenting -7 in signed integer or in IEEE 754 yields the same bit pattern.
1.The above statement is true
2.The above statement is false
3.It depends on whether the machine is 32-bit or 64-bit
4.It depends on whether the machine is big-endian or little endian.
(D) Suppose x = 0x0023 and y = 0x2300, which of the following conditions is evaluated to true if used in an if-statement?
1.(x && y)
2.(x & y)
3.both of them
4.none of them
(E) The following number: 00011101 can be interpreted as:
1.unsigned number 2. signed number 3. both 4. none
2. (5 points) List the bugs in the following code. No need to correct them. 代写计算机系统组织
#define NUM 100
void adjust_data(){
int * x;
x = malloc(NUM * sizeof(int));
x[0] = 40000;
for(i = 1; i <= NUM; i++)
x[i] = x[i-1]++;
return x[0];
}
3.(2 points) What is the difference between macros and function calls in term of: resulting code size and speed? 代写计算机系统组织
4. Assume we have the following array: int x[4];We want to access x[i]. Assume the array starts at address 0xA0080000.
a.(2 points)Write a single IA-32 assembly instruction to implement:
y = x[i]; Assume i is already stored in eax and y is stored in ebx.
b.(2 points) What is the starting address of x[3] if the machine is big-endian? 代写计算机系统组织
5.(2 points) Why don’t we have a movl src, dest instruction with both src and destination are memory addresses?
6.(2 points) State two advantages for moving from 32-bit machines to 64-bit machines.
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