For the RISC-V assembly instructions below, what is the corresponding C statement? Assume that the variables f, g, h, i, and j are assigned to registers x5, x6, x7, x28, and x29, respectively. Assume that the base address of the arrays A and B are in registers x10 and x11, respectively. slli x30, x5, 2 // x30 = f4 add x30, x10, x30 // x30 = &A[f] slli x31, x6, 2 // x31 = g4 add x31, x11, x31 // x31 = &B[g] lw x5, 0(x30) // f = A[f] addi x12, x30, 4 lw x30, 0(x12) add x30, x30, x5 sw x30, 0(x31)

时间: 2024-02-05 14:04:23 浏览: 55

The corresponding C statement is: ``` B[g+1] = A[f] + A[f+1]; ``` Explanation: - `slli x30, x5, 2`: Shift the value of register `x5` (which contains `f`) left by 2 bits (multiply by 4) and store the result in register `x30`. - `add x30, x10, x30`: Add the value of register `x10` (which contains the base address of array `A`) to the value of register `x30` (which now contains `&A[f]`) and store the result in register `x30`. Now `x30` contains the memory address of `A[f]`. - `slli x31, x6, 2`: Shift the value of register `x6` (which contains `g`) left by 2 bits (multiply by 4) and store the result in register `x31`. - `add x31, x11, x31`: Add the value of register `x11` (which contains the base address of array `B`) to the value of register `x31` (which now contains `&B[g]`) and store the result in register `x31`. Now `x31` contains the memory address of `B[g]`. - `lw x5, 0(x30)`: Load the value stored at memory address `x30` into register `x5`. Now `x5` contains the value of `A[f]`. - `addi x12, x30, 4`: Add 4 to the value of register `x30` (which still contains the memory address of `A[f]`) and store the result in register `x12`. Now `x12` contains the memory address of `A[f+1]`. - `lw x30, 0(x12)`: Load the value stored at memory address `x12` (which now contains `A[f+1]`) into register `x30`. - `add x30, x30, x5`: Add the value of register `x5` (which contains `A[f]`) to the value of register `x30` (which now contains `A[f+1]`) and store the result in register `x30`. Now `x30` contains the sum `A[f] + A[f+1]`. - `sw x30, 0(x31)`: Store the value of register `x30` (which contains `A[f] + A[f+1]`) at the memory address `x31` (which contains `B[g+1]`). Now `B[g+1]` is updated with the sum `A[f] + A[f+1]`.

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