[Bug c++/28361] New: Pointer arithmetic failure

[pfister at reith-pfister dot de]

if you do something like this:
char *buffer;

int i;

buffer = (char *) malloc (sizeof (struct something) * 1024);

for (i=0; i < 1024;i++)
   memcpy (buffer + i * sizeof (struct something),&i;sizeof (int));

then when i == 255 there is no data stored in buffer. I mean i can read out the
correct value from buffer for every increment (i * sizeof (struct something)),
but when i == 255 the value read out is 0. When i == 256 all works fine again.


-- 
           Summary: Pointer arithmetic  failure
           Product: gcc
           Version: 4.0.3
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pfister at reith-pfister dot de
 GCC build triplet: x86
  GCC host triplet: x86
GCC target triplet: x86


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28361