gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-44.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O -fdump-tree-fre1" } */
   3
   4 struct A { float x, y; };
   5 struct B { struct A u; };
   6 void bar (struct A *);
   7
   8 float
   9 f1 (struct B *x, int y)
  10 {
  11   struct A p;
  12   p.x = 1.0f;
  13   p.y = 2.0f;
  14   struct A *q = &x[y].u;
  15   *q = p;
  16   float f = x[y].u.x + x[y].u.y;
  17   bar (&p);
  18   return f;
  19 }
  20
  21 float
  22 f2 (struct B *x, int y)
  23 {
  24   struct A p;
  25   p.x = 1.0f;
  26   p.y = 2.0f;
  27   x[y].u = p;
  28   float f = x[y].u.x + x[y].u.y;
  29   bar (&p);
  30   return f;
  31 }
  32
  33 float
  34 f3 (struct B *x, int y)
  35 {
  36   struct A p;
  37   p.x = 1.0f;
  38   p.y = 2.0f;
  39   struct A *q = &x[y].u;
  40   __builtin_memcpy (&q->x, &p.x, sizeof (float));
  41   __builtin_memcpy (&q->y, &p.y, sizeof (float));
  42   float f = x[y].u.x + x[y].u.y;
  43   bar (&p);
  44   return f;
  45 }
  46
  47 float
  48 f4 (struct B *x, int y)
  49 {
  50   struct A p;
  51   p.x = 1.0f;
  52   p.y = 2.0f;
  53   __builtin_memcpy (&x[y].u.x, &p.x, sizeof (float));
  54   __builtin_memcpy (&x[y].u.y, &p.y, sizeof (float));
  55   float f = x[y].u.x + x[y].u.y;
  56   bar (&p);
  57   return f;
  58 }
  59
  60 /* { dg-final { scan-tree-dump-times "return 3.0" 4 "fre1" } } */