[Bug tree-optimization/35672] [4.2 Regression] GCC 4.2.3 ICE on valid code: KDE 3.5.9 libdjvu compilation fails

[rguenth at gcc dot gnu dot org]

------- Comment #3 from rguenth at gcc dot gnu dot org  2008-03-23 13:09 -------
-ftree-loop-linear has known problems that were addressed only in 4.3.0, so
this is probably a dup of one of those.

Reduced testcase:

static inline int
min(const int x, const int y) { return (x <= y) ? x : y; }

static inline int
max(const int x, const int y) { return (y <= x) ? x : y; }

struct GPixel
{
  unsigned char b;
  unsigned char g;
  unsigned char r;
};

void
YCbCr_to_RGB(GPixel *p, int w, int h, int rowsize)
{
  for (int i=0; i<h; i++,p+=rowsize)
    {
      GPixel *q = p;
      for (int j=0; j<w; j++,q++)
        {
          signed char y = ((signed char*)q)[0];
          signed char b = ((signed char*)q)[1];
          signed char r = ((signed char*)q)[2];

          int t1 = b >> 2 ;
          int t2 = r + (r >> 1);
          int t3 = y + 128 - t1;
          int tr = y + 128 + t2;
          int tg = t3 - (t2 >> 1);
          int tb = t3 + (b << 1);
          q->r = max(0,min(255,tr));
          q->g = max(0,min(255,tg));
          q->b = max(0,min(255,tb));
        }
    }
}


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|major                       |normal
             Status|UNCONFIRMED                 |NEW
          Component|c++                         |tree-optimization
     Ever Confirmed|0                           |1
           Keywords|                            |ice-on-valid-code
      Known to fail|                            |4.2.3
      Known to work|                            |4.1.2 4.3.0
   Last reconfirmed|0000-00-00 00:00:00         |2008-03-23 13:09:24
               date|                            |
            Summary|GCC 4.2.3 ICE on valid code:|[4.2 Regression] GCC 4.2.3
                   |KDE 3.5.9 libdjvu           |ICE on valid code: KDE 3.5.9
                   |compilation fails           |libdjvu compilation fails
   Target Milestone|---                         |4.2.4


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35672