gcc/testsuite/gcc.dg/pr70169.c

   1 /* PR tree-optimization/70169 */
   2 /* { dg-do compile } */
   3 /* { dg-options "-O2 -fno-strict-aliasing -fno-tree-dce" } */
   4 /* { dg-skip-if "Program and data reside in different address spaces" { "avr-*-*" } } */
   5 /* { dg-require-effective-target label_values } */
   6
   7 int printf (const char *, ...);
   8
   9 void
  10 foo ()
  11 {
  12   unsigned char *p = (unsigned char *) &printf;
  13   for (;;)
  14     (*p)++;
  15 }
  16
  17 void
  18 bar (int x)
  19 {
  20   unsigned char *p = (unsigned char *) &printf;
  21   int i;
  22   for (i = 0; i < x; i++)
  23     (*p)++;
  24 }
  25
  26 void
  27 baz (int x, int y)
  28 {
  29   unsigned char *p = (unsigned char *) &&lab;
  30   int i;
  31   if (y)
  32     {
  33       for (i = 0; i < x; i++)
  34         (*p)++;
  35     }
  36   else
  37     {
  38      lab:
  39       asm volatile ("");
  40       foo ();
  41     }
  42 }