gcc/testsuite/gcc.dg/pr33136-1.c

   1 /* PR tree-optimization/33136 */
   2 /* { dg-do run } */
   3 /* { dg-options "-O2" } */
   4
   5 extern void abort (void);
   6
   7 struct S
   8 {
   9   struct S *a;
  10   int b;
  11   float f;
  12 };
  13
  14 static struct S s;
  15
  16 static int *
  17 __attribute__((noinline, const))
  18 foo (void)
  19 {
  20   return &s.b;
  21 }
  22
  23 float
  24 __attribute__((noinline))
  25 bar (float *f)
  26 {
  27   s.f = 1.0;
  28   *f = 4.0;
  29   return s.f;
  30 }
  31
  32 int
  33 __attribute__((noinline))
  34 baz (int *x)
  35 {
  36   s.b = 1;
  37   *x = 4;
  38   return s.b;
  39 }
  40
  41 int
  42 t (void)
  43 {
  44   float f = 8.0;
  45   return bar (&f) + baz (foo ());
  46 }
  47
  48 int
  49 main (void)
  50 {
  51   if (t () != 5)
  52     abort ();
  53   return 0;
  54 }