Question

Simulation: Write a MIPS program which computes the vector dot product. Vector dot product involves calculations of two vectors. Let A and B be two vectors of length n. Their dot product is defined as: Dot Product-2.0 A(i): B(i) Where the result is stored in memory location DOTPROD. The first elements of each vector, A(0) and B(0), are stored at memory locations A_vec and B_vec, with the remaining elements in the following word locations Results: Put your MIPS code here and test it with the following two vectors: A-(2,4,20, 13, 3, 10, 5) and B (4, 2, 1, 2, 5, 2,4)

Answer 1

 1 ;-------------------------------------------------
 2 ; mult3.asm - this calculates a "dot product" of
 3 ;  two n-element arrays, according to this C ftn:
 4 ;
 5 ;   int mult3( int *dst, int *src)
 6 ;   {
 7 ;       int sum = 0;
 8 ;       int i;
           int n; // no.of element in arrary
           cin>>n;
 9 ;       for (i = 0; i < n; i++)
10 ;           sum += dst[i] * src[i];
11 ;       return sum;
12 ;   }
13 ;
14 ; This also introduces a very simple Nasm "macro".
15 ;-------------------------------------------------
16 global _mult3
17 
18 sum equ 16      ; like C " #define sum 16 "
19 
20     section .text
21 _mult3:
22     push ebp
23     mov ebp,esp
24     push esi
25     push edi
       mov ebx , 7 //here n is number of elements

26     sub esp, 4  ; "sum"
27 
28     mov esi, [ebp+12]
29     mov edi, [ebp+8]
30     mov dword [ebp-sum], 0
31     mov ecx, 0
32 .forloop:
33     mov eax, [edi + ecx*4]
34     imul dword [esi + ecx*4]
35     inc ecx
36 
37     add [ebp-sum], eax
38 
39     cmp ecx, ebx
40     jb .forloop
41 
42     mov eax, [ebp-sum]
43     add esp, 4

44     pop edi
45     pop esi
46     pop ebp
47     ret
48 ;-------------------------------------------------