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  1. #include <iostream>
  2. #include <cstdlib>
  3.  
  4. int main() {
  5.     int x = -5;  
  6.     int a = 3;   
  7.     int y1 = 0;
  8.     int y2 = 0;
  9.     int y = 0;
  10.  
  11.  
  12.     __asm__ (
  13.         "movl %[x], %%eax \n\t"
  14.         "cmpl $0, %%eax \n\t"
  15.         "jl negative_x \n\t"
  16.         "subl %[a], %%eax \n\t"
  17.         "movl %%eax, %[y1] \n\t"
  18.         "jmp done_y1 \n\t"
  19.         "negative_x: \n\t"
  20.         "negl %%eax \n\t"
  21.         "movl %%eax, %[y1] \n\t"
  22.         "done_y1: \n\t"
  23.         : [y1] "=r" (y1)
  24.         : [x] "r" (x), [a] "r" (a)
  25.         : "eax"
  26.     );
  27.  
  28.  
  29.     __asm__ (
  30.         "movl %[x], %%eax \n\t"
  31.         "movl $3, %%ebx \n\t"
  32.         "cdq \n\t"
  33.         "idivl %%ebx \n\t"
  34.         "cmpl $1, %%edx \n\t"
  35.         "je mod_equal_one \n\t"
  36.         "movl $7, %[y2] \n\t"
  37.         "jmp done_y2 \n\t"
  38.         "mod_equal_one: \n\t"
  39.         "addl %[a], %[x] \n\t"
  40.         "movl %[x], %[y2] \n\t"
  41.         "done_y2: \n\t"
  42.         : [y2] "=r" (y2)
  43.         : [x] "r" (x), [a] "r" (a)
  44.         : "eax", "ebx", "edx"
  45.     );
  46.  
  47.  
  48.     __asm__ (
  49.         "movl %[y1], %%eax \n\t"
  50.         "subl %[y2], %%eax \n\t"
  51.         "movl %%eax, %[y] \n\t"
  52.         : [y] "=r" (y)
  53.         : [y1] "r" (y1), [y2] "r" (y2)
  54.         : "eax"
  55.     );
  56.  
  57.     std::cout << "y1: " << y1 << std::endl;
  58.     std::cout << "y2: " << y2 << std::endl;
  59.     std::cout << "y: " << y << std::endl;
  60.  
  61.     return 0;
  62. }
  63.  
Success #stdin #stdout 0.01s 5284KB
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stdin
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Standard input is empty
stdout
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y1: 5
y2: 7
y: -2
https://ideone.com/cKQm3G
language:
C++ (gcc 8.3)
created:
14 hours ago
visibility:
public

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