maximum.s

   1 # purpose: this program finds the maximum number of a set of data items.
   2
   3 # variables: the registers have the following uses:
   4 # %edi - holds the index of the data item being examined
   5 # %ebx - largest data item found
   6 # %eax - current data item
   7
   8 # data_items - contains the item data. A 0 is used to terminate the data
   9
  10 .section .data
  11 data_items:
  12 .long 3, 64, 34, 37, 0
  13
  14 .section .text
  15 .globl _start
  16 _start:
  17 movl $0, %edi
  18 movl data_items(,%edi,4), %eax
  19 movl %eax, %ebx
  20
  21 start_loop:
  22 cmpl $0, %eax
  23 je loop_exit
  24 incl %edi
  25 movl data_items(,%edi, 4), %eax
  26 cmpl %ebx, %eax
  27 jle start_loop
  28 movl %eax, %ebx
  29 jmp start_loop
  30
  31 loop_exit:
  32 movl $1, %eax
  33 int $0x80