13721891
Pregunta 1
Pregunta
Given the declaration int A[10][20]; in C, the following assembly code implements A[i][j] = 1; (assuming A, i, and j are all global variables).
Respuesta
- True
- False
Pregunta 2
Pregunta
The code (a && b) || (!a && !b) implements -
Respuesta
-
Adder
-
Equality
-
MUX
-
Set membership
Pregunta 3
Pregunta
What is the difference between logical and bitwise operators. (for example && and &)
Respuesta
-
The logical and operator ‘&&’ expects its operands to be boolean expressions (either 1 or 0) and returns a boolean value. The bitwise and operator ‘&’ works on Integral (short, int, unsigned, char, bool, unsigned char, long) values and return Integral value. If an integral value is used as an operand for ‘&&’ which is supposed to work on boolean values, following rule is used in C. …..A zero is considered as false and non-zero is considered as true. For example in the following program x and y are considered as 1. The ‘&&’ operator doesn’t evaluate second operand if first operand becomes false. Similarly ‘||’ doesn’t evaluate second operand when first operand becomes true. The bitwise ‘&’ and ‘|’ operators always evaluate their operands.
-
&& (logical and operator) - The left and right operands are boolean expressions. If both the operands are non-zero, then the condition becomes true. > & (bitwise and operator) - The left and right operands are integral types. Binary AND Operator copies a bit to the result if it exists in both operands.
-
это открытый вопрос, выше два примера как можно ответить (этот вариант отмечен как правильный)
Pregunta 4
Pregunta
Initially byte i of memory is i + 0x20 (mod 256), %eax contains the number 3, and %ebx contains the number 5. What is in %ebx after running x86 movl (%eax), %ebx?
Respuesta
-
None of the above
-
3
-
0x25
-
0x23
Pregunta 5
Pregunta
Choose the correct compilation of rax = (rbx ? rcx : rdx)?
Respuesta
Pregunta 6
Respuesta
-
Serial processing
-
Linear processing
-
Parallel processing
-
none of the above
Pregunta 7
Respuesta
-
Serial processing
-
Linear processing
-
Parallel processing
-
none of the above
Pregunta 8
Pregunta
Object files are:
Respuesta
-
не вариантов
-
не правильный вариант
Pregunta 9
Pregunta
Thread (as with OpenMP) Which of the following is true?
Respuesta
-
нет вариантов
-
не правильный ответ
Pregunta 10
Pregunta
______construct encloses code, forming a parallel region.
Respuesta
-
parallel
-
не правильный вариант
Pregunta 11
Pregunta
____ is the default schedule type. Upon entering the loop, each thread independently decides which chunk of the loop they will process
Respuesta
-
static
-
не правильный вариант
Pregunta 12
Pregunta
OpenMP assigns one iteration to each thread. When the thread finishes, it will be assigned the next iteration that hasn’t been executed yet.
Respuesta
-
This program can be greatly improved with a dynamic schedule.
-
не правильный вариант
Pregunta 13
Pregunta
The _____ directive causes threads encountering the barrier to wait until all the other threads in the same team have encountered the barrier.
Respuesta
-
barrier
-
не правильный вариант
Pregunta 14
Pregunta
What is the value of the following C expression? x = 0xBC and y = 0x35 (x & !y)
Respuesta
-
0x0000
-
0x0001
-
0xFFF
-
0x1200
Pregunta 15
Pregunta
We say that pipelining generally increases throughput. That statement means (select all that are part of the definition of “increases throughput”):
Respuesta
-
A entire programs take more time to complete
-
B entire programs take less time to complete
-
C each instruction takes less time to complete
-
D each instruction takes more time to complete
Pregunta 16
Pregunta
Consider the following code. Which of the following memory errors does it have? Select all that apply.
Respuesta
-
confusing pointer and value sizes
-
reading uninitialized memory
-
off-by-one memory access error
-
dereferencing a value as if it were a pointer
-
returning references to nonexistent values
Pregunta 17
Pregunta
What kind of locality does the following code benefit from? Assume that n and m are very large numbers.
Respuesta
-
spatial locality
-
temporal locality
-
both of the above
-
none of the above
Pregunta 18
Pregunta
Given that a and b are each either 0 or 1, which one of the following is not always true?
Respuesta
-
(a ∧ b) == ((a - b) & 1)
-
(a ∧ b) == (a != b)
-
(a ∧ b) == ((a + b) >> 1)
-
(a ∧ b) == (a ? !b : b)
Pregunta 19
Pregunta
What is a “caller-save” register?
Respuesta
-
A special register that saves who called the procedure
-
A program register that the called procedure may not modify
-
A program register that the called procedure may modify
-
none of the above
Pregunta 20
Pregunta
A fully-associative cache is like a
Respuesta
-
direct-mapped cache with only one set
-
direct-mapped cache with only one line per set
-
set-associative cache with only one line per set
-
set-associative cache with only one set
Pregunta 21
Pregunta
Consider the following code. Which of the following changes would make the largest positive impact on its cache locality?
Respuesta
-
Block the accesses by nesting three or four for loops instead of just two
-
Change int** to int*
-
Change the for-j loop to count up from 0, not down from m-1
-
Put the for-i loop inside of the for-j loop instead of the other way around
Pregunta 22
Pregunta
Consider the following code. Which of the following changes would make the largest positive impact on its cache locality?
Respuesta
-
Change int** to int*
-
Put the for-i loop inside of the for-j loop instead of the other way around
-
Change the for-j loop to count up from 0, not down from m-1
-
Block the accesses by nesting three or four for loops instead of just two
Pregunta 23
Pregunta
In C, assuming that an int takes 4 bytes, if array a is declared as follows and a has the value 0x10000, what is the value of the expression a + 2? int a[12];
Respuesta
-
0x10002
-
0x10008
-
0x10004
-
8 plus the contents of location 0x10000
Pregunta 24
Pregunta
Given unsigned int variables a and b, if a + b == a ^ b is true, then which of the following must also be true?
Respuesta
-
a + b == a * b
-
a + b == a | b
-
a + b == a - b
-
a + b == a & b
Pregunta 25
Pregunta
The bias of any IEEE-style floating point number is 2e−1 − 1, where e is the number of exponent bits. Suppose 010010 is a six-bit IEEE-style floating point number that represents the decimal value 2.5. How many exponent bits does the number have?
Respuesta
-
1
-
5
-
4
-
3
-
2
Pregunta 26
Pregunta
Consider a six-bit IEEE-style floating-point number with 1 sign, 2 exponent, and 3 fraction bits. Assume the bias is 1. Answers are written in binary. What is the largest denormalized value?
Respuesta
-
0.0111
-
0.01111
-
0.111
-
1111
Pregunta 27
Pregunta
Consider a six-bit IEEE-style floating-point number with 1 sign, 2 exponent, and 3 fraction bits. Assume the bias is 1. Answers are written in binary. How many of the 26 bit patters in this format are NaNs?
Respuesta
-
1
-
5, 6, or 7
-
8
-
between 9 and 15
-
32
Pregunta 28
Pregunta
Consider a six-bit IEEE-style floating-point number with 1 sign, 2 exponent, and 3 fraction bits. Assume the bias is 1. Answers are written in binary.EEE
What is the smallest non-negative normalized value?
Respuesta
-
1
-
0.1
-
0.0001
-
0
Pregunta 29
Pregunta
Consider a 5-bit IEEE-style floating point number with 3 exponent bits (bias 3). Which of the following can be expressed in this format? Options are written in binary
Respuesta
-
1.01
-
−0.0001
-
11000
-
−111
-
None of the above can be represented in this format
-
None of the above because you can’t have a 5-bit IEEE-style floating point number with 3 exponent bits
Pregunta 30
Pregunta
Y86 does not have an instruction for jumping to an address stored in a register location; instead the conceptual action jmp %eax can be implemented by
Respuesta
-
rmmovl %eax, $1234 ; jmp $1234
-
pushl %eax ; ret
-
rrmovl %eax, %PC
-
All of the above work
-
None of the above work
Pregunta 31
Pregunta
Given int variables a and b, which of the following implements if (!a) b == 0;?
Respuesta
-
b &= !!a;
-
b &= !-a;
-
b &= !a;
-
b &= a;
-
b &= -a;
-
b &= -!a;
-
none of the above
¿Quieres crear tus propios Tests gratis con GoConqr? Más información.