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Write a function (subroutine) that inputs a data value in register r0 and returns value in r0. The function returns y 5 a 1 bx 1 cx2, where a, b, and c are parameters built into the function (i.e., they are not passed to it). The subroutine also performs clipping. If the output is greater than a value d, it is constrained to d (clipped). The input in r0 is a positive binary value in the range 0 to 0xFF. Apart from r0, no other registers may be modified by this subroutine. Write ARM code to implement the following C operation.

Int s=0;
for ( i = 0; i < 10; i++) { s = s + i*i;)

Sagot :

Solution :

  int f(int x){

      [tex]\text{return a + b*x +c*x*x}[/tex];

  }*/

  int f([tex]\text{int R0}[/tex]){

      int stack[2] = {[tex]\text{R1,R2}[/tex]};

      [tex]\text{R1 = R0}[/tex];

      [tex]\text{R1 = R1}\times \text{ R1}[/tex];

      [tex]\text{R2 = C}[/tex];

      R1 = R1 * C; /*R1 = [tex]cx^2[/tex]*/

      [tex]\text{R2 = B}[/tex];

      [tex]\text{R0 = R0}[/tex] * R2; /* R0 = bx */

      [tex]\text{R0 = R0 + R1}[/tex]; /*R0 = [tex]bx + cx^2[/tex] */

      [tex]\text{R2 = C}[/tex];

      [tex]\text{R0 = R0 + R2}[/tex]; /*R0 = a+bx+cx^2 */

      [tex]\text{R1 = stack[0];}[/tex]

     [tex]\text{ R2 = stack[1];}[/tex]

     [tex]\text{ return R0;}[/tex]

  }

  /*[tex]\text{ARM code to implement the following C operation}[/tex]

  int s=0;

  [tex]\text{for ( i = 0; i < 10; i++)}[/tex]

  { [tex]\text{s = s + i } \times i[/tex];)

  */

          AREA SumSquares, code, readWrite

          ENTRY

          [tex]\text{MOV r0, #0}[/tex]        ;loop [tex]\text{ counter i present at 0}[/tex]

          MOV r1, #0       ; s = 0

  Loop   [tex]\text{MUL r2, r0, r0}[/tex]   ;calculate i*i

          [tex]\text{ADD r1, r1, r2}[/tex]   ;s = s+ i*i

          [tex]\text{ADDS r0, r0}[/tex], #1   ; i = i+1

          [tex]\text{CMP r0}[/tex],#10       ; test for end

          [tex]\text{BNE}[/tex] Loop        ; [tex]\text{continue until all added}[/tex]

          END

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