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SDP10 Final - Part II

Csse 1502 31 preguntas Actualizado el 13 may 2018

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1Given 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).
1. AVerdadero
2. BFalso
2The code (a && b) || (!a && !b) implements -
1. AAdder
2. BEquality
3. CMUX
4. DSet membership
3What is the difference between logical and bitwise operators. (for example && and &)
1. AThe 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.
2. B&& (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.
3. Cэто открытый вопрос, выше два примера как можно ответить (этот вариант отмечен как правильный)
4Initially 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?
1. ANone of the above
2. B3
3. C0x25
4. D0x23
5Choose the correct compilation of rax = (rbx ? rcx : rdx)?
1. A
2. B
3. C
4. D
6This is an example of?
1. ASerial processing
2. BLinear processing
3. CParallel processing
4. Dnone of the above
7This is an example of?
1. ASerial processing
2. BLinear processing
3. CParallel processing
4. Dnone of the above
8Object files are:
1. Aне вариантов
2. Bне правильный вариант
9Thread (as with OpenMP) Which of the following is true?
1. Aнет вариантов
2. Bне правильный ответ
10______construct encloses code, forming a parallel region.
1. Aparallel
2. Bне правильный вариант

11____ is the default schedule type. Upon entering the loop, each thread independently decides which chunk of the loop they will process
1. Astatic
2. Bне правильный вариант
12OpenMP assigns one iteration to each thread. When the thread finishes, it will be assigned the next iteration that hasn’t been executed yet.
1. AThis program can be greatly improved with a dynamic schedule.
2. Bне правильный вариант
13The _____ directive causes threads encountering the barrier to wait until all the other threads in the same team have encountered the barrier.
1. Abarrier
2. Bне правильный вариант
14What is the value of the following C expression? x = 0xBC and y = 0x35 (x & !y)
1. A0x0000
2. B0x0001
3. C0xFFF
4. D0x1200
15We say that pipelining generally increases throughput. That statement means (select all that are part of the definition of “increases throughput”):
1. AA entire programs take more time to complete
2. BB entire programs take less time to complete
3. CC each instruction takes less time to complete
4. DD each instruction takes more time to complete
16Consider the following code. Which of the following memory errors does it have? Select all that apply.
1. Aconfusing pointer and value sizes
2. Breading uninitialized memory
3. Coff-by-one memory access error
4. Ddereferencing a value as if it were a pointer
5. Ereturning references to nonexistent values
17What kind of locality does the following code benefit from? Assume that n and m are very large numbers.
1. Aspatial locality
2. Btemporal locality
3. Cboth of the above
4. Dnone of the above
18Given that a and b are each either 0 or 1, which one of the following is not always true?
1. A(a ∧ b) == ((a - b) & 1)
2. B(a ∧ b) == (a != b)
3. C(a ∧ b) == ((a + b) >> 1)
4. D(a ∧ b) == (a ? !b : b)
19What is a “caller-save” register?
1. AA special register that saves who called the procedure
2. BA program register that the called procedure may not modify
3. CA program register that the called procedure may modify
4. Dnone of the above
20A fully-associative cache is like a
1. Adirect-mapped cache with only one set
2. Bdirect-mapped cache with only one line per set
3. Cset-associative cache with only one line per set
4. Dset-associative cache with only one set
21Consider the following code. Which of the following changes would make the largest positive impact on its cache locality?
1. ABlock the accesses by nesting three or four for loops instead of just two
2. BChange int** to int*
3. CChange the for-j loop to count up from 0, not down from m-1
4. DPut the for-i loop inside of the for-j loop instead of the other way around
22Consider the following code. Which of the following changes would make the largest positive impact on its cache locality?
1. AChange int** to int*
2. BPut the for-i loop inside of the for-j loop instead of the other way around
3. CChange the for-j loop to count up from 0, not down from m-1
4. DBlock the accesses by nesting three or four for loops instead of just two
23In 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];
1. A0x10002
2. B0x10008
3. C0x10004
4. D8 plus the contents of location 0x10000
24Given unsigned int variables a and b, if a + b == a ^ b is true, then which of the following must also be true?
1. Aa + b == a * b
2. Ba + b == a | b
3. Ca + b == a - b
4. Da + b == a & b
25The 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?
1. A1
2. B5
3. C4
4. D3
5. E2
26Consider 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?
1. A0.0111
2. B0.01111
3. C0.111
4. D1111
27Consider 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?
1. A1
2. B5, 6, or 7
3. C8
4. Dbetween 9 and 15
5. E32
28Consider 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?
1. A1
2. B0.1
3. C0.0001
4. D0
29Consider 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
1. A1.01
2. B−0.0001
3. C11000
4. D−111
5. ENone of the above can be represented in this format
6. FNone of the above because you can’t have a 5-bit IEEE-style floating point number with 3 exponent bits
30Y86 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
1. Armmovl %eax, $1234 ; jmp $1234
2. Bpushl %eax ; ret
3. Crrmovl %eax, %PC
4. DAll of the above work
5. ENone of the above work
31Given int variables a and b, which of the following implements if (!a) b == 0;?
1. Ab &= !!a;
2. Bb &= !-a;
3. Cb &= !a;
4. Db &= a;
5. Eb &= -a;
6. Fb &= -!a;
7. Gnone of the above

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Descripción: SDP10 Test sobre SDP10 Final - Part II, creado por Csse 1502 el 13/05/2018.
Autor: Csse 1502
Idioma: English
Visitas: 328
Historial: Creado el 13 may 2018 · actualizado el 13 may 2018
Etiquetas: sdp10
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SDP10 Final - Part II

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