[Bug tree-optimization/56157] [4.8 Regression] ICE with -ftree-vectorize in in compute_live_loop_exits

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56157



--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> 2013-01-31 
11:59:06 UTC ---

Even more reduced, avoids any loop versioning in the vectorizer:



struct Pixel {

    unsigned short r;

    unsigned short g;

    unsigned short b;

    unsigned short a;

};



void fn(unsigned char * __restrict dst, const unsigned char * __restrict src)

{

  unsigned x;

  for(x = 0; x < 1024; x += 1)

    {

      struct Pixel pixel;

      pixel.r = (unsigned short)(((unsigned)src[0]) * 0xffff / 0xff);

      pixel.g = (unsigned short)(((unsigned)src[1]) * 0xffff / 0xff);

      pixel.b = (unsigned short)(((unsigned)src[2]) * 0xffff / 0xff);

      pixel.a = (unsigned short)(((unsigned)src[3]) * 0xffff / 0xff);

      __builtin_memcpy(dst, &pixel, sizeof pixel);

      src += 4;

      dst += 8;

    }

}