Unit 4

Question 1

When adding operands with blank, overflow cannot occur.

Answer 1

different signs

Question 2

There are similar restrictions to the occurrence of overflow during subtract, but it’s just the opposite principle: when the signs of the operands are the blank, overflow cannot occur.

Answer 2

same

Question 3

Blank occurs in subtraction when we subtract a negative number from a positive number and get a negative result, or when we subtract a positive number from a negative number and get a positive result.

Answer 3

Overflow

Question 4

Hardware that performs addition, subtraction, and usually logical operations such as AND and OR

Answer 4

Arithmetic Logic Unit (ALU)

Question 5

Which LEGv8 load instructions should be generated for byte and halfword arithmetic operations?

Answer 5

LDURB, LDURH

Question 6

Which LEGv8 arithmetic instructions should be generated for byte and halfword arithmetic operations?

Answer 6

ADD, SUB, MUL, DIV

Question 7

Which LEGv8 store instructions should be generated for byte and halfword arithmetic operations?

Answer 7

STURB, STURH

Question 8

In multiplication, the first operand is called the blank and the second the blank. The final result is called the blank.

Answer 8

multiplicand
multiplier
product

Question 9

In fact, if we ignore the sign bits, the length of the multiplication of an n-bit multiplicand and an m-bit multiplier is a product that is blank long. That is, blank are required to represent all possible products.

Answer 9

n + m bits

Question 10

To produce a properly signed or unsigned 128-bit product, LEGv8 has three instructions: blank, blank and blank

Answer 10

multiply (MUL)
signed multiply high (SMULH)
unsigned multiply high (UMULH)

Question 11

Divide’s two operands, called the blank and blank, and the result, called the blank, are accompanied by a second result, called the blank.

Answer 11

dividend and divisor
quotient
remainder

Question 12

A number being divided.

Answer 12

Dividend

Question 13

A number that the dividend is divided by.

Answer 13

Divisor

Question 14

The primary result of a division; a number that when multiplied by the divisor and added to the remainder produces the dividend.

Answer 14

Quotient

Question 15

The secondary result of a division; a number that when added to the product of the quotient and the divisor produces the dividend.

Answer 15

Remainder

Question 16

A notation that renders numbers with a single digit to the left of the decimal point.

Answer 16

Scientific notation

Question 17

A number in floating-point notation that has no leading 0s.

Answer 17

Normalized

Question 18

Computer arithmetic that represents numbers in which the binary point is not fixed.

Answer 18

Floating point

Question 19

The value, generally between 0 and 1, placed in the fraction field. The fraction is also called the mantissa.

Answer 19

Fraction

Question 20

In the numerical representation system of floating-point arithmetic, the value that is placed in the exponent field

Answer 20

Exponent

Question 21

A situation in which a positive exponent becomes too large to fit in the exponent field.

Answer 21

Overflow (floating-point)

Question 22

A situation in which a negative exponent becomes too large to fit in the exponent field.

Answer 22

Underflow (floating-point)

Question 23

A floating-point value represented in a 64-bit doubleword.

Answer 23

Double precision

Question 24

A floating-point value represented in a 32-bit word.

Answer 24

Single precision

Question 25

Also called interrupt. An unscheduled event that disrupts program execution; used to detect overflow.

Answer 25

Exception

Question 26

An exception that comes from outside of the processer. (Some architectures use the term interrupt for all exceptions.

Answer 26

Interrupt

Question 27

This symbol is NaN, for blank. The purpose of NaNs is to allow programmers to postpone some tests and decisions to a later time in the program when they are convenient.

Answer 27

Not a Number

Question 28

LEGv8 supports the IEEE 754 single-precision and double-precision formats with these instructions

Answer 28

Floating-point addition, single (FADDS) and addition, double (FADDD) Floating-point subtraction, single (FSUBS) and subtraction, double (FSUBD) Floating-point multiplication, single (FMULS) and multiplication, double (FMULD) Floating-point division, single (FDIVS) and division, double (FDIVD) Floating-point comparison, single (FCMPS) and comparison, double (FCMPD), with the condition codes given slightly different interpretations

Question 29

The first of two extra bits kept on the right during intermediate calculations of floating-point numbers; used to improve rounding accuracy.

Answer 29

Guard

Question 30

Method to make the intermediate floating-point result fit the floating-point format; the goal is typically to find the nearest number that can be represented in the format. It is also the name of the second of two extra bits kept on the right during intermediate floating-point calculations, which improves rounding accuracy.

Answer 30

Round

Question 31

The number of bits in error in the least significant bits of the significand between the actual number and the number that can be represented.

Answer 31

Units in the last place (ulp)

Question 32

A bit used in rounding in addition to guard and round that is set whenever there are nonzero bits to the right of the round bit.

Answer 32

Sticky bit

Question 33

Fused multiply add: A floating-point instruction that performs both a multiply and an add, but rounds only once after the add.

Answer 33

Fused multiply add

Question 34

Given that the parallelism occurs within a wide word, the extensions are classified as blank. It is also classified under the more general name of data level parallelism. They are known as well as vector or SIMD, for single instruction, multiple data (see COD Section 6.6 (Introduction to graphics processing units)).

Answer 34

subword parallelism

Question 35

ARMv8 added _____-bit registers to support subword parallelism.

Answer 35

128

Question 36

The add instruction, ADD, includes support for 8-bit, 16-bit, 32-bit, 64-bit, and 128-bit numbers. Operands can be integers, but not blank

Answer 36

floating point numbers

Question 37

Number of assembly-language integer arithmetic and floating-point instructions in ARMv8

Answer 37

63

Question 38

Floating-point multiply instruction that produces a negative product

Answer 38

FNMUL

Question 39

Number of ARMv8 arithmetic core instructions

Answer 39

15

Question 40

Conditional compare that only compares if the initial condition is true

Answer 40

FCCMP

Question 41

ARMv8 has _____ assembly-language SIMD instructions.

Answer 41

245

Question 42

Which SIMD instruction version means the width of the elements in the destination register is twice the width of the elements in all source registers?

Answer 42

long

Question 43

Each SIMD version is denoted by a _____.

Answer 43

suffix

Question 44

The prefixes U, S, and F refer to _____

Answer 44

data types

Question 45

Wide means the width of the elements in the destination register and the first source registers is twice the width of the elements in the second source register.

Answer 45

Wide

Question 46

Blank means the width of the elements in the destination register is twice the width of the elements in all source registers.

Answer 46

Long

Question 47

Blank means the width of the elements in the destination register is half the width of the elements in all source registers.

Answer 47

Narrow

Question 48

IEEE 754 is a _____ for floating-point representation and computation.

Answer 48

standard

Question 49

The field of _____ examines how to solve mathematical problems using imprecision and limited representation of data.

Answer 49

numerical analysis

Question 50

A situation where an operation yields a number that is too small to represent with the fixed number of bits available is called _____.

Answer 50

underflow