Write a function (subroutine) that inputs a data value in register r0 and returns value in...
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;)
Homework Answers
I have also provided the code along with the code screenshot. Do comment, if you have any queries.
ARM code for expression a+bx+cx^2
/*pseudo-code of the given
problem
int f(int x){
return a + b*x +c*x*x;
}*/
int f(int R0){
int stack[2] = {R1,R2};
R1 = R0;
R1 = R1 * R1;
R2 = C;
R1 = R1 * C; /*R1 = cx^2*/
R2 = B;
R0 = R0 * R2; /* R0 = bx */
R0 = R0 + R1; /*R0 = bx +
cx^2*/
R2 = C;
R0 = R0 + R2; /*R0 = a+bx+cx^2
*/
R1 = stack[0];
R2 = stack[1];
return R0;
}
/*ARM code to implement the following
C operation
int s=0;
for ( i = 0; i < 10; i++)
{ s = s + i*i;)
*/
AREA
SumSquares, code, readWrite
ENTRY
MOV r0, #0
;loop counter i present at 0
MOV r1,
#0 ; s = 0
Loop MUL r2, r0, r0 ;calculate
i*i
ADD r1, r1,
r2 ;s = s+ i*i
ADDS r0, r0,
#1 ; i = i+1
CMP
r0,#10 ; test for end
BNE Loop
; continue until all added
END
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