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