[Bug tree-optimization/24609] Same value duplicated in two different registers

[pinskia at gcc dot gnu dot org]

------- Comment #2 from pinskia at gcc dot gnu dot org  2005-11-01 14:54 -------
Actually it is "int*" and "int" and that mainly comes down to how we repesent
(int*)[d];
If we change the code (we should be able to do this in the IR also, Daniel
Berlin had a patch which did it):
extern int abs (int __x);
extern int bar (short*, short, int);

struct s
{
  short int* top;
  short int* left;
  short int* diag;
};
typedef int aar[];
typedef aar *aptr;
typedef char par[];
typedef par *pptr;

int
foo (int *a, struct s* p, short int pv[6][16])
{
  int s = 0;
  int b;
  aptr a1;
  a1 = (aptr)(a);
  pptr p1= (pptr)(p);


  for (b = 0; b < 6; ++b)
    {
      int d;
      short int ps;

      if (abs (p->left[0] - p->diag[0])
          < abs (p->diag[0] - p->top[0]))
        d = 1;
      else
        d = 2;
      (*a1)[b] = d;

      ps = (*p1)[d - 1];

      s += bar (pv[b], ps, a[b]);
    }

  return s;
}
--

We get:
.L12:
        movl    $1, %eax
        xorl    %edx, %edx
.....
        jl      .L12
        movl    $2, %eax
        movl    $1, %edx
        jmp     .L5


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24609