[Bug rtl-optimization/28812] New: RTL aliasing vs may_alias and structs

[pinskia at gcc dot gnu dot org]

The following testcase should work with -fstrict-aliasing -O2 but does not:

struct S { short x; };
typedef struct S __attribute__((__may_alias__)) test;

test *p;

int g(int *a)
{
 p = (test*)a;
}

int f()
{
  int a;
  g(&a);
  a = 10;
  test s={1};
  *p=s;
  return a;
}

int main() {
  if (f() == 10)
    __builtin_abort();
  return 0;
}


-- 
           Summary: RTL aliasing vs may_alias and structs
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: rtl-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pinskia at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28812