What is the binary encoding of the following RISC-V assembly instruction? Please write your answer as...

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Question

What is the binary encoding of the following RISC-V assembly instruction? Please write your answer as...

What is the binary encoding of the following RISC-V assembly instruction? Please write your answer as an 8-digit hexadecimal number.

addi x1, x2, -3

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Answer 1

Answer #1

What is the binary encoding of the following RISC-V assembly instruction:

addi x1, x2, -3

Answer: FFD10093 (8- digit hexadecimal)

Description:

• Instruction format: ADDI dest, src1, const

• The above instruction performs the addition of src1 and constant that is immediate value and stores in destination.

• addi x1, x2, -3 means that x1 ← x2 - 3

• Instruction field representation as follows:

31 20 19 15 14 12 11 7 6 0 imm[11:0 rd opcode rs1 Funct3 7 bits 12 bits 5 bits 3 bits 5 bits I-Immediate [11:01 OP-IMM ADDI d

• Writing provided instruction as above format: addi x1, x2, -3

1111111101 00010 0010011 000 00001

ͦ I-Immediate: -3 = 111111111101 (sign-extended or 2's compliment representation)

ͦ src: x2 = 00010

ͦ funct3: 000

ͦ dest: x1 = 00001

ͦ opcode: 0010011

• Binary: 11111111110100010000000010010011

• Hexadecimal: 0xFFD10093

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Answer 2

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