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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. #include <windows.h>
  5.  
  6. #define T int
  7. typedef struct FakeVector FakeVector;
  8. struct FakeVector
  9. {
  10.   T *mem;
  11.   size_t capacity;
  12.   size_t count;
  13. };
  14.  
  15. #define CHECK_ADD 1
  16.  
  17. void Add(FakeVector *vec, T *item)
  18. {
  19.   while (1)
  20.   {
  21. #if CHECK_MULTIPLY
  22.     // This...
  23.     if (vec->capacity > vec->capacity * 2)
  24.       abort();
  25.     // ...generates:
  26.     // 0x00401504    mov    0x8(%rcx),%rdx
  27.     // 0x00401508	lea    (%rdx,%rdx,1),%rax
  28.     // 0x0040150C	cmp    %rdx,%rax
  29.     // 0x0040150F	jae    0x401516 <Add+22>
  30.     // 0x00401511	callq  0x4075d0 <abort>
  31.     // 0x00401516	test   %rdx,%rdx
  32.     // 0x00401519	mov    $0x10,%edx
  33.     // 0x0040151E	cmove  %rdx,%rax
  34.     // 0x00401522	incq   0x10(%rcx)
  35.     // 0x00401526	mov    %rax,0x8(%rcx)
  36.     vec->capacity = vec->capacity
  37.      ? (vec->capacity * 2)
  38.      : 16;
  39.     ++vec->count;
  40.  
  41. #elif CHECK_ADD
  42.  
  43.     //if (vec->capacity + 1 < vec->capacity)
  44.     if (vec->capacity > vec->capacity + 1)
  45.       abort();
  46.  
  47.     // 0x00401504	mov    0x8(%rcx),%rdx
  48.     // 0x00401508	lea    0x1(%rdx),%rax
  49.     // 0x0040150C	cmp    %rdx,%rax
  50.     // 0x0040150F	jae    0x401516 <Add+22>
  51.     // 0x00401511	callq  0x4075d0 <abort>
  52.     // 0x00401516	test   %rdx,%rdx
  53.     // 0x00401519	mov    $0x10,%edx
  54.     // 0x0040151E	cmove  %rdx,%rax
  55.     // 0x00401522	mov    %rax,0x8(%rcx)
  56.  
  57.     vec->capacity = vec->capacity
  58.      ? (vec->capacity + 1)
  59.      : 16;
  60. #endif
  61.   }
  62. }
  63.  
  64. //volatile int trick;
  65.  
  66. int main()
  67. {
  68.   DebugBreak();
  69.   FakeVector *vec;
  70.   vec = (FakeVector*)calloc(1, sizeof(*vec));
  71.   T val;
  72.   while (1)
  73.     Add(vec, &val);
  74.   return 0;
  75. }
  76.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin 
Standard input is empty
compilation info 
prog.cpp:4:21: fatal error: windows.h: No such file or directory
compilation terminated.
stdout 
Standard output is empty
https://ideone.com/2jnfWB
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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