gcc/testsuite/gcc.dg/tree-ssa/pr86061.c

   1 /* { dg-options "-O2 -fdump-tree-dse-details -fno-tree-fre" } */
   2
   3
   4 struct S { int i; char n[128]; int j; };
   5
   6 void f (char*);
   7
   8 void g (struct S *p)
   9 {
  10   char a[sizeof p->n + 1];
  11
  12   __builtin_memset (a, 0, sizeof a);   // dead store, can be eliminated
  13
  14   __builtin_strncpy (a, p->n, sizeof a - 1);
  15   a[sizeof a - 1] = '\0';
  16
  17   f (a);
  18 }
  19
  20 /* { dg-final { scan-tree-dump-times "Deleted dead call" 1 "dse1" } } */