RISC-V: Instruction

How many registers are there in RISC-V?

• 31

• 16

• 64

• 32

In RISC-V what is the instruction for the addition operation (i.e., you want to calculate the summation)

• sub

• addw

• ld

• add

what does the following instruction do?
add a, b, c

• b=a+c

• a=b+c

• c=a+b

• a=a+b

If variables x, y, and z are mapped to register x2, x3, and x4, respectively, then what would be appropriate RISC-V instruction for the following?
y = x - z

• add x2, x1, x3

• sub x2, x1, x3

• add x3, x2, x4

• sub x3, x2, x4

What would be the byte address of the 5th element of an array that stores words?

• 32

• 40

• 20

• 64

Let's assume A[10] is an array (double word), and the address of A[0] is stored in register x5; then, how do we load the 10th element of the array into x6?

• ld x5, 10(x6)

• ld x6, 10(x5)

• ld x6, x5[80]

• ld x6, 80(x5)

Which instruction to use to store a double word in RISC-V?

• sd

• lw

• sw

• ld