gcc/testsuite/gcc.dg/Walloca-2.c

   1 /* { dg-do compile } */
   2 /* { dg-require-effective-target alloca } */
   3 /* { dg-options "-Walloca-larger-than=2000 -O2" } */
   4
   5 void f (void *);
   6
   7 void
   8 g1 (int n)
   9 {
  10   void *p;
  11   if (n > 0 && n < 2000)
  12     // FIXME: This is a bogus warning, and is currently happening on
  13     // 32-bit targets because VRP is not giving us any range info for
  14     // the argument to __builtin_alloca.  This should be fixed by the
  15     // upcoming range work.
  16     p = __builtin_alloca (n); // { dg-bogus "unbounded use of 'alloca'" "" { xfail { ! lp64 } } }
  17   else
  18     p = __builtin_malloc (n);
  19   f (p);
  20 }
  21
  22 void
  23 g2 (int n)
  24 {
  25   void *p;
  26   if (n < 2000)
  27     p = __builtin_alloca (n); // { dg-warning "may be too large" }
  28   else
  29     p = __builtin_malloc (n);
  30   f (p);
  31 }
  32
  33 void
  34 g3 (int n)
  35 {
  36   void *p;
  37   if (n > 0 && n < 3000)
  38     {
  39       p = __builtin_alloca (n); // { dg-warning "may be too large" }
  40     }
  41   else
  42     p = __builtin_malloc (n);
  43   f (p);
  44 }