gcc/testsuite/gcc.dg/pr79715.c

   1 /* PR tree-optimization/79715 - hand-rolled strdup with unused result
   2    not eliminated
   3    { dg-do compile }
   4    { dg-options "-O2 -Wall -fdump-tree-optimized" } */
   5
   6 void f (const char *s)
   7 {
   8   unsigned n = __builtin_strlen (s) + 1;
   9   char *p = __builtin_malloc (n);
  10   __builtin_memcpy (p, s, n);
  11   __builtin_free (p);
  12 }
  13
  14 void g (const char *s)
  15 {
  16   unsigned n = __builtin_strlen (s) + 1;
  17   char *p = __builtin_malloc (n);
  18   __builtin_strcpy (p, s);
  19   __builtin_free (p);
  20 }
  21
  22 /* { dg-final { scan-tree-dump-not "free" "optimized" } }
  23    { dg-final { scan-tree-dump-not "malloc" "optimized" } }
  24    { dg-final { scan-tree-dump-not "memcpy" "optimized" } }
  25    { dg-final { scan-tree-dump-not "strcpy" "optimized" } }
  26    { dg-final { scan-tree-dump-not "strlen" "optimized" } } */