RISC V- C with examples

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McMaster University *

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2GA3

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Arts Humanities

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Oct 30, 2023

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txt

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2

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x5 – x7, x28 – x31: temporary registers - not preserved by the callee only save x1 and x10 at start when its non leaf/recursive procedure. addi sp sp -8 adjust stack for 2 items sw x1 4(sp) save return address sw x10 0(sp) save the argument n lw x10, 0(sp) #restore argument n lw x1, 4(sp) #restore return address if (i==j) f = g+h; else f = g-h; g,h,i,j... in x19, x20,...x23 bne x22, x23, Else add x19, x20, x21 // f = g + h beq x0, x0, Exit// unconditional Else:sub x19, x20, x21 // f = g −h Exit: while (save[i] == k) i += 1; •i in x22, k in x24, address of save in x25 Loop: slli x10, x22, 2 // x10 = i * 4 add x10, x10, x25 // x10 = address of save[i] lw x9, 0(x10) // x9 = save[i] bne x9, x24, Exit // go to Exit if save[i]!=k addi x22, x22, 1 // i = i+1 beq x0, x0, Loop Exit: .. temp = v[k]; v[k] = v[k+1]; v[k+1] = temp; swap: slli x6, x11, 2 // reg x6 = k * 4 add x6, x10, x6 // reg x6 = v + (k * 4) lw x5, 0(x6) // reg x5 (temp) = v[k] lw x7, 4(x6) // reg x7 = v[k + 1] sw x7, 0(x6) // v[k] = reg x7 sw x5, 4(x6) // v[k+1] = reg x5 (temp)
jalr x0, 0(x1) // return to calling routine clear2(int *array, size_t int size){ int *p; for (p = &array[0]; p < &array[size]; p = p + 1) *p = 0; } addi x5, x10, 0 // p = address of array[0] loop2: sw x0, 0(x5) // Memory[p] = 0 addi x5, x5, 4 // p = p + 4 slli x6, x11, 2 // x6 = size * 4 add x7, x10, x6 // x7 = address of array[size] bltu x5, x7, loop2 // if (p<&array[size]) go to loop2
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