Question

Assume we have an array int* arr = {1,21,32,43,54}. The values in arr store in the...

Assume we have an array int* arr = {1,21,32,43,54}. The values in arr store in the memory of 0(x27), 8(x27), …, 32(x27). Convert the following RISC-V code into a C program.

ld x5, 24(x27)

addi x8, x0, 0(x27)

srl x5, x5, x6

sd x5, 0(x27)

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Answer #1

Answer.

Step 1

RISC-V is an assembly language. It contains 32 bit integer registers and 32 bit floating point registers. It is compose through simple instructions to do a single task. In this language, data can be store in two ways, store on main memory or store on registers.
In the given problem following commands are used:

  • ld command is use to load double word.
  • addi command is used to add with sign extended.
  • srl command is used for logical right shifts.
  • sd command is used to store double word.

Step 2

RISC-V code C-code Explanation
ld x5, 24(x27) x5=arr[3] or x5=43 sets x5 equal to arr[3]
addi x8, x0, 0(x27) x8=x1+arr[0] or x8=x1+1 Add 1 to x0 and store in x8
srl x5, x5, x6 x5=x5<<x6 Logical right shifts x5 by x6 and store in x5
sd x5, 0(x27) x5=arr[0] or x5=1 store double word, initialize x5 by 1

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