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  1. .comm x,4,4
  2. .comm y,4,4
  3.  
  4. .section    .rodata
  5.  
  6. format1:    .string "Div : %d / %d = %.2f\n"
  7. format2:    .string "Mod : %d %% %d = %d\n"
  8. format3:    .string "Multiply : %u * %u = %llu\n"
  9. format4:    .string "%d %d"
  10. const100:   .int 100
  11.  
  12. .text
  13. .globl  main
  14. .type   main, @function
  15. main:
  16.     subl $32, %esp # allocate space, preserve alignment
  17.  
  18.     movl $format4, (%esp)
  19.     movl $x, 4(%esp)
  20.     movl $y, 8(%esp)
  21.     call scanf
  22.  
  23. # operation divide
  24.     fildl x
  25.     fimul const100
  26.     fidivl y
  27. # truncate to integer
  28. # use this if current FPU rounding mode
  29. # is known to be truncate
  30. #   frndint
  31. # otherwise use this
  32.     fnclex
  33.     fnstcw (%esp)       # save a copy to modify
  34.     fnstcw 2(%esp)      # and a copy to preserve
  35.     orw $0x0c00, (%esp) # rounding mode = truncate
  36.     fldcw (%esp)        # activate
  37.     frndint             # do the truncate
  38.     fldcw 2(%esp)       # restore original
  39. # end of truncate code
  40.     fidiv const100
  41.     fstpl 12(%esp) # x / y
  42.  
  43.     movl $format1, (%esp)
  44.     movl x, %eax
  45.     movl %eax, 4(%esp)
  46.     movl y, %eax
  47.     movl %eax, 8(%esp)
  48.     call printf
  49.  
  50. # operation modulo
  51.     movl x, %eax
  52.     cltd
  53.     idivl y
  54.     movl $format2, (%esp)
  55.     movl x, %eax
  56.     movl %eax, 4(%esp)
  57.     movl y, %eax
  58.     movl %eax, 8(%esp)
  59.     movl %edx, 12(%esp)
  60.     call printf
  61.  
  62. # operation multiply
  63.     movl x, %eax
  64.     mull y
  65.     movl $format3, (%esp)
  66.     movl x, %ecx
  67.     movl %ecx, 4(%esp)
  68.     movl y, %ecx
  69.     movl %ecx, 8(%esp)
  70.     movl %eax, 12(%esp)
  71.     movl %edx, 16(%esp)
  72.     call printf
  73.  
  74.     addl $32, %esp
  75.     xor %eax, %eax
  76.     ret
  77.  
Success #stdin #stdout 0.01s 1572KB
comments (?)
stdin
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19 1000
stdout
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Div : 19 / 1000 = 0.01
Mod : 19 % 1000 = 19
Multiply : 19 * 1000 = 19000
https://ideone.com/qmsrPO
language:
Assembler 32bit (gcc 8.3)
created:
11 years ago
visibility:
public

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