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  1. .data
  2.         a : .long 6
  3.         r : .long 0
  4.         out : .string "result %d\n"
  5. .text
  6. .global main
  7. fib:
  8.         pushl %ebp
  9.         movl %esp, %ebp
  10.         movl 8(%ebp), %eax
  11.         cmpl $0, %eax #fib(0)=0
  12.         je endf
  13.         cmpl $1, %eax #fib(1)=1
  14.         je endf
  15.         decl %eax #eax=n-1
  16.         pushl %eax #set arg
  17.         call fib #re in ecx
  18.         popl %eax #get n-1
  19.         decl %eax #eax=n-2
  20.         pushl %ecx #save result for n-1
  21.         pushl %eax #set arg
  22.         call fib #res in ecx
  23.         popl %eax # eax=n-2, discard
  24.         popl %eax # eax=fib(n-1)
  25.         addl %eax, %ecx #fib(n)=fib(n-1)+fib(n+2)
  26.         movl %ebp,%esp #Exit
  27.         popl %ebp
  28.         ret
  29. endf:
  30.         movl %eax, %ecx#fib(0) or fib(1) to %ebx
  31.         movl %ebp,%esp
  32.         popl %ebp
  33.         ret
  34.  
  35. main:
  36.         pushl a  #stack [a]
  37.         call fib #result in %ecx
  38.         popl %eax # remove arg to fib
  39.         pushl %ecx
  40.         pushl $out
  41.         call printf
  42.         addl $8, %esp
  43.         xor %eax, %eax
  44.         ret
  45.  
Success #stdin #stdout 0.01s 1524KB
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Standard input is empty
stdout
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result 8
https://ideone.com/hpeloe
language:
Assembler 32bit (gcc 8.3)
created:
11 years ago
visibility:
public

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