fork download 
  1. struct A
  2. {
  3.     volatile int a_;
  4. };
  5.  
  6. int main()
  7. {
  8.     A* a = new A;
  9.     a->a_ = 10;
  10.     volatile int i1 = 0, i2 = 0;
  11.     asm("LABEL_1:":::);
  12.     i1 = (*a).a_;
  13.     asm("LABEL_2:":::);
  14.     i2 = a->a_;
  15.     asm("LABEL_3:":::);
  16.     return 0;
  17. }
  18.  
  19. /*
  20. $ g++ --std=c++11 -S -O3 deref.cpp
  21.  
  22.     LABEL_1:
  23. # 0 "" 2
  24. #NO_APP
  25. 	movl	(%rax), %edx
  26. 	movl	%edx, 8(%rsp)
  27. #APP
  28. # 13 "deref.cpp" 1
  29. 	LABEL_2:
  30. # 0 "" 2
  31. #NO_APP
  32. 	movl	(%rax), %eax
  33. 	movl	%eax, 12(%rsp)
  34. #APP
  35. # 15 "deref.cpp" 1
  36. 	LABEL_3:
  37.  
  38. */
Success #stdin #stdout 0s 3024KB
comments (?)
stdin 
Standard input is empty
stdout 
Standard output is empty
https://ideone.com/Ovj7ao
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!