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Homework 02

Homework 02

2.4

\(\text{B[g] = A[f] + A[f + 1]}\)

2.8

f = &A + &A

2.12

0000000 00001 00001 000 00001 0110011

由 opcode 可知为 R 型指令，为 add x1,x1,x1

2.14

R 型指令，sub x6,x7,x5，0100000 00101 00111 000 00110 0110011

2.17

2.17.1

x7 = (x7 << 4) | x6 = 0x0000000AAAAAAAA0 | 0x1234567812345678 = 0x1234567ABABEFEF8

2.17.2

x7 = x6 << 4 = 0x2345678123456780

2.17.3

x7 = (x5 >> 3) & 0xFEF = 0x0000000015555555 & 0xFEF = 0x545

2.22

2.22.1

从 0x1FF00000 到 0x200FFFFE

2.22.2

从 0x1FFFF000 到 0x20000FFE

2.24

2.24.1

20

2.24.2

C
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acc = 0;
i = 10;
while (i != 0){
    acc += 2;
    i -= 1;
}

2.24.3

\(4\times N+1\)

2.24.4

C
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acc = 0;
i = 10;
while (i >= 0){
    acc += 2;
    i -= 1;
}

2.29

Text Only
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fib:
    beq x10,x0,done
    addi x5,x0,1
    beq x10,x5,done
    addi x2,x2,-16
    sd x1,0(x2)
    sd x10,8(x2)
    addi x10,x10,-1
    jal x1,fib
    ld x5,8(x2)
    sd x10,8(x2)
    addi x10,x5,-2
    jal x1,fib
    ld x5,8(x2)
    add x10,x10,x5
    ld x1,0(x2)
    addi x2,x2,16
done:
    jalr x0,x1

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