[Bug tree-optimization/36054] bad code generation with -ftree-vectorize

[Joey dot ye at intel dot com]

------- Comment #13 from Joey dot ye at intel dot com  2008-05-05 07:22 -------
It is helpful. Root cause is that memory allocated by new is only aligned to 8
bytes under i386. In your case, object Environment is allocated by new and its
constructor tried to use movdqa to initialize its members. Following small case
shows the problem:
/* Compile with option -m32 -msse2 
   Current behavior: runtime segment fault
 */
#include <stdio.h>
#include <emmintrin.h>

struct A {
public:
        __m128i m;
        void init() { m = _mm_setzero_si128(); }
};

int main()
{
        A * a = new A;
        printf("Address of A: %p\n", a);
        a->init();
        delete a;
        return 0;
}


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36054