[Bug middle-end/35544] New: Error with -fprofile-use

["xinliangli at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

In the following example, profile data generated by -O0 binary run can not be
used for profile-use at -O2. This is either a bug or design flaw if not
supported.

g++ -fprofile-generate devirt.cc
./a.out
g++ -fprofile-use -O2 devirt.cc

==>
devirt.cc: In function 'int main()':
devirt.cc:45: error: coverage mismatch for function 'main' while reading
counter 'arcs'
devirt.cc:45: note: number of counters is 9 instead of 7


// devirt.cc

class A {
public:
  virtual int foo() {
     return 1;
  }

int i;
};

class B : public A
{
public:
  virtual int foo() {
     return 2;
  }

 int b;
} ;


int main()
{
 int i;

  A* ap = 0;

  for (i = 0; i < 10000; i++)
  {

     if (i%7==0)
     {
        ap = new A();
     }
     else
        ap = new B();

    ap->foo();

    delete ap;

  }

  return 0;

}


-- 
           Summary: Error with -fprofile-use
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: xinliangli at gmail dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35544