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

   1 /* PR tree-optimization/96670 - ICE on memchr with an empty initializer
   2    { dg-do compile }
   3    { dg-options "-O -Wall -fdump-tree-optimized" } */
   4
   5 struct {
   6   int i, j;
   7 } const s = { };
   8
   9 void memchr_success_unused (void)
  10 {
  11   int n = (char *)&s.j - (char *)&s;
  12   char *p = (char *)&s;
  13   __builtin_memchr (p, '\0', n);
  14 }
  15
  16 void memchr_success_used (void)
  17 {
  18   int n = (char *)&s.j - (char *)&s;
  19   char *p = (char *)&s;
  20   if (&s != __builtin_memchr (p, '\0', n))
  21     __builtin_abort ();
  22 }
  23
  24 void memchr_fail_unused (void)
  25 {
  26   int n = (char *)&s.j - (char *)&s;
  27   char *p = (char *)&s;
  28   __builtin_memchr (p, '\5', n);
  29 }
  30
  31 void memchr_fail_used (void)
  32 {
  33   int n = (char *)&s.j - (char *)&s;
  34   char *p = (char *)&s;
  35   if (__builtin_memchr (p, '\5', n))
  36     __builtin_abort ();
  37 }
  38
  39 /* { dg-prune-output "\\\[-Wunused-value" }
  40    { dg-final { scan-tree-dump-not "abort" "optimized" } }
  41    { dg-final { scan-tree-dump-not "memcmp \\(" "optimized" } } */