#include <stdio.h>
#include <emmintrin.h>

// Compiling with the "-O" flag causes program to segfault. If it is
// compiled without "-0" it runs perfectly.
//
// gcc -v -save-temps -march=pentium4 -msse2 -I/usr/include  bug_creator.c


//------------------------
//Variables
__m128i A1;
__m128i B1;
__m128i BITMASK;

__m128i A2;
__m128i B2;
//--------------------


void
LEVEL_2(){
  
  B1 = _mm_add_epi32(B1,A1);
  A1 = _mm_add_epi32(A1,_mm_add_epi32(_mm_setzero_si128(), _mm_add_epi32(_mm_setzero_si128(),BITMASK)));
  A2 = _mm_add_epi32(_mm_add_epi32(A1,A1),_mm_add_epi32(_mm_add_epi32(A1,A1),A1));
  
  B2 = _mm_add_epi32(_mm_add_epi32(B1,A1),_mm_add_epi32(_mm_add_epi32(B1,A1),A1));
 

  B1 = _mm_add_epi32(B1,A1);
  A1 = _mm_add_epi32(A1,_mm_add_epi32(_mm_setzero_si128(), _mm_add_epi32(_mm_setzero_si128(),BITMASK)));
  
  A2 = _mm_add_epi32(A2,_mm_add_epi32(_mm_add_epi32(A1,BITMASK),_mm_add_epi32(_mm_setzero_si128(),BITMASK)));
  
}

void
LEVEL_3(){
  LEVEL_2();
}

int
main(int argc,
  char **argv){
  

  
  A1 = _mm_setzero_si128();
  B1 = _mm_setzero_si128();
  A2 = _mm_setzero_si128();
  B2 = _mm_setzero_si128();
  BITMASK = _mm_setzero_si128();

  
  LEVEL_3();

  
  //Everything is initialized to zero and "_mm_add_epi32" is the only
  //operation used so everything should be zero.
  printf("A1: %d\n",_mm_extract_epi16(A1,0));
  printf("B1: %d\n",_mm_extract_epi16(B1,0));
  printf("A2: %d\n",_mm_extract_epi16(A2,0));
  printf("B2: %d\n",_mm_extract_epi16(A2,0));
  printf("BITMASK: %d\n",_mm_extract_epi16(BITMASK,0));
  return 1;
}