[Bug middle-end/65330] New: restrict should be considered when folding through references from global vars

[hubicka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65330

            Bug ID: 65330
           Summary: restrict should be considered when folding through
                    references from global vars
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hubicka at gcc dot gnu.org

In the following testcase the restrict should be taken into account when
folding testrestrict.

const int *varptr=&var;
const int *__restrict__ varptr2=&var;

 int *__restrict__ varptr3 = &var;
 int *__restrict__ varptr4 = &var;

int *
return_valptr(int i)
{
  return varptr[i];
}
int * __restrict__
return_valptr2(int i)
{
  return varptr2[i];
}
int
testrestrict ()
{
  int *ptr = return_valptr (0);
  *ptr = 0;
  *varptr3 = 1;
  return *ptr;
}
int
testrestrict2 ()
{
  int *ptr = return_valptr2 (0);
  *ptr = 0;
  *varptr3 = 1;
  return *ptr;
}
int
testrestrict4 ()
{
  *varptr4 = 0;
  *varptr3 = 1;
  return *varptr4;
}