write assembly language programs to: -perform decision making using branch instr

Question

write assembly language programs to:
            -perform decision making using branch instructions.
            -create loops
            -use syscall operations to display integers and strings on the console window
            -use syscall operations to read integers from the keyboard.

Assignment Description:

An array of integers can be assigned to a memory address in the .data section of a MIPS assembly language program as show below. Here the length of the array is stored first, and then the elements of the array numbers next. A C program that will ask a user to enter two integers and compute the sum of numbers in the array that are between those two integers (inclusive). Implement a MIPS assembly language program to compute the sum of numbers in the array that are between the entered integers. If your program causes an infinite loop, press Control and 'C' keys at the same time to stop it.  Name your source code file assignment5.s.

                     .data
numbers_len:         .word     14
numbers:             .word     11, 24, 3, -6, 14, -18, 21, 45, 12, -27, 35, -7, 44, -28

The following shows how it looks like in a C program:

Explanation / Answer

=========================================================

Program in assembly language format

=========================================================

   .file   "arrays.c"
   .section   .rodata
.LC0:
   .string   "Enter an integer:"
.LC1:
   .string   "%d"
.LC2:
   .string   "Enter another integer:"
   .align 8
.LC3:
   .string   "The sum of numbers that are inbetween: %d "
   .text
.globl main
   .type   main, @function
main:
.LFB0:
   .cfi_startproc
   pushq   %rbp
   .cfi_def_cfa_offset 16
   .cfi_offset 6, -16
   movq   %rsp, %rbp
   .cfi_def_cfa_register 6
   subq   $96, %rsp
   movl   $11, -80(%rbp)
   movl   $24, -76(%rbp)
   movl   $3, -72(%rbp)
   movl   $-6, -68(%rbp)
   movl   $14, -64(%rbp)
   movl   $-18, -60(%rbp)
   movl   $21, -56(%rbp)
   movl   $45, -52(%rbp)
   movl   $12, -48(%rbp)
   movl   $-27, -44(%rbp)
   movl   $35, -40(%rbp)
   movl   $-7, -36(%rbp)
   movl   $44, -32(%rbp)
   movl   $-28, -28(%rbp)
   movl   $0, -8(%rbp)
   movl   $.LC0, %edi
   call   puts
   movl   $.LC1, %eax
   leaq   -84(%rbp), %rdx
   movq   %rdx, %rsi
   movq   %rax, %rdi
   movl   $0, %eax
   call   __isoc99_scanf
   movl   $.LC2, %edi
   call   puts
   movl   $.LC1, %eax
   leaq   -88(%rbp), %rdx
   movq   %rdx, %rsi
   movq   %rax, %rdi
   movl   $0, %eax
   call   __isoc99_scanf
   movl   -84(%rbp), %edx
   movl   -88(%rbp), %eax
   cmpl   %eax, %edx
   jge   .L2
   movl   -84(%rbp), %eax
   movl   %eax, -16(%rbp)
   movl   -88(%rbp), %eax
   movl   %eax, -12(%rbp)
   jmp   .L3
.L2:
   movl   -88(%rbp), %eax
   movl   %eax, -16(%rbp)
   movl   -84(%rbp), %eax
   movl   %eax, -12(%rbp)
.L3:
   movl   $0, -4(%rbp)
   jmp   .L4
.L6:
   movl   -4(%rbp), %eax
   cltq
   movl   -80(%rbp,%rax,4), %eax
   cmpl   -16(%rbp), %eax
   jl   .L5
   movl   -4(%rbp), %eax
   cltq
   movl   -80(%rbp,%rax,4), %eax
   cmpl   -12(%rbp), %eax
   jg   .L5
   movl   -4(%rbp), %eax
   cltq
   movl   -80(%rbp,%rax,4), %eax
   addl   %eax, -8(%rbp)
.L5:
   addl   $1, -4(%rbp)
.L4:
   cmpl   $13, -4(%rbp)
   jle   .L6
   movl   $.LC3, %eax
   movl   -8(%rbp), %edx
   movl   %edx, %esi
   movq   %rax, %rdi
   movl   $0, %eax
   call   printf
   nop
   leave
   .cfi_def_cfa 7, 8
   ret
   .cfi_endproc
.LFE0:
   .size   main, .-main

===============================================

Output:

===============================================

[~]$ gcc arrays.s -o arrays
[~]$ ./arrays
Enter an integer:
1
Enter another integer:
100
The sum of numbers that are inbetween: 209

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