Attachment 8402 Details for Bug 20494 – the code causing segfault

the code causing segfault

bug_creator.c (text/plain), 1.52 KB, created by Isaac Elias on 2005-03-16 13:19:13 UTC

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Creator: Isaac Elias

Created: 2005-03-16 13:19:13 UTC

Size: 1.52 KB

patch

obsolete

>#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;
>}

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Attachments on bug 20494: 8401 | 8402