13721891
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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).
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- True
- False
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The code (a && b) || (!a && !b) implements -
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Adder
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Equality
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MUX
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Set membership
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What is the difference between logical and bitwise operators. (for example && and &)
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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.
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&& (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.
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это открытый вопрос, выше два примера как можно ответить (этот вариант отмечен как правильный)
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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?
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None of the above
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3
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0x25
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0x23
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Choose the correct compilation of rax = (rbx ? rcx : rdx)?
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Serial processing
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Linear processing
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Parallel processing
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none of the above
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Serial processing
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Linear processing
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Parallel processing
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none of the above
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Object files are:
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не вариантов
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не правильный вариант
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Thread (as with OpenMP) Which of the following is true?
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нет вариантов
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не правильный ответ
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______construct encloses code, forming a parallel region.
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parallel
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не правильный вариант
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____ is the default schedule type. Upon entering the loop, each thread independently decides which chunk of the loop they will process
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static
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не правильный вариант
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OpenMP assigns one iteration to each thread. When the thread finishes, it will be assigned the next iteration that hasn’t been executed yet.
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This program can be greatly improved with a dynamic schedule.
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не правильный вариант
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The _____ directive causes threads encountering the barrier to wait until all the other threads in the same team have encountered the barrier.
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barrier
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не правильный вариант
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What is the value of the following C expression? x = 0xBC and y = 0x35 (x & !y)
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0x0000
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0x0001
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0xFFF
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0x1200
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We say that pipelining generally increases throughput. That statement means (select all that are part of the definition of “increases throughput”):
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A entire programs take more time to complete
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B entire programs take less time to complete
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C each instruction takes less time to complete
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D each instruction takes more time to complete
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Consider the following code. Which of the following memory errors does it have? Select all that apply.
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confusing pointer and value sizes
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reading uninitialized memory
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off-by-one memory access error
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dereferencing a value as if it were a pointer
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returning references to nonexistent values
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What kind of locality does the following code benefit from? Assume that n and m are very large numbers.
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spatial locality
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temporal locality
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both of the above
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none of the above
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Given that a and b are each either 0 or 1, which one of the following is not always true?
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(a ∧ b) == ((a - b) & 1)
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(a ∧ b) == (a != b)
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(a ∧ b) == ((a + b) >> 1)
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(a ∧ b) == (a ? !b : b)
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What is a “caller-save” register?
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A special register that saves who called the procedure
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A program register that the called procedure may not modify
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A program register that the called procedure may modify
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none of the above
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A fully-associative cache is like a
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direct-mapped cache with only one set
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direct-mapped cache with only one line per set
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set-associative cache with only one line per set
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set-associative cache with only one set
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Consider the following code. Which of the following changes would make the largest positive impact on its cache locality?
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Block the accesses by nesting three or four for loops instead of just two
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Change int** to int*
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Change the for-j loop to count up from 0, not down from m-1
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Put the for-i loop inside of the for-j loop instead of the other way around
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Consider the following code. Which of the following changes would make the largest positive impact on its cache locality?
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Change int** to int*
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Put the for-i loop inside of the for-j loop instead of the other way around
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Change the for-j loop to count up from 0, not down from m-1
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Block the accesses by nesting three or four for loops instead of just two
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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];
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0x10002
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0x10008
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0x10004
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8 plus the contents of location 0x10000
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Given unsigned int variables a and b, if a + b == a ^ b is true, then which of the following must also be true?
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a + b == a * b
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a + b == a | b
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a + b == a - b
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a + b == a & b
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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?
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1
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5
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4
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3
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2
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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?
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0.0111
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0.01111
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0.111
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1111
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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?
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1
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5, 6, or 7
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8
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between 9 and 15
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32
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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?
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1
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0.1
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0.0001
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0
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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
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1.01
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−0.0001
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11000
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−111
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None of the above can be represented in this format
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None of the above because you can’t have a 5-bit IEEE-style floating point number with 3 exponent bits
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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
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rmmovl %eax, $1234 ; jmp $1234
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pushl %eax ; ret
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rrmovl %eax, %PC
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All of the above work
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None of the above work
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Given int variables a and b, which of the following implements if (!a) b == 0;?
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b &= !!a;
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b &= !-a;
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b &= !a;
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b &= a;
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b &= -a;
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b &= -!a;
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none of the above
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