gcc/testsuite/gcc.dg/strcmpopt_2.c

   1 /* { dg-do run } */
   2 /* { dg-options "-O2 -fdump-tree-strlen" } */
   3
   4 char s[100] = {'a','b','c','d'};
   5 typedef struct { char s[8]; int x; } S;
   6
   7 __attribute__ ((noinline)) int
   8 f1 (S *s)
   9 {
  10   return __builtin_strcmp (s->s, "abc") != 0;
  11 }
  12
  13 __attribute__ ((noinline)) int
  14 f2 (void)
  15 {
  16   return __builtin_strcmp (s, "abc") != 0;
  17 }
  18
  19 __attribute__ ((noinline)) int
  20 f3 (S *s)
  21 {
  22   return __builtin_strcmp ("abc", s->s) != 0;
  23 }
  24
  25 __attribute__ ((noinline)) int
  26 f4 (void)
  27 {
  28   return __builtin_strcmp ("abc", s) != 0;
  29 }
  30
  31 __attribute__ ((noinline)) int
  32 f5 (S *s)
  33 {
  34   return __builtin_strncmp (s->s, "abc", 3) != 0;
  35 }
  36
  37 __attribute__ ((noinline)) int
  38 f6 (void)
  39 {
  40   return __builtin_strncmp (s, "abc", 2) != 0;
  41 }
  42
  43 __attribute__ ((noinline)) int
  44 f7 (S *s)
  45 {
  46   return __builtin_strncmp ("abc", s->s, 3) != 0;
  47 }
  48
  49 __attribute__ ((noinline)) int
  50 f8 (void)
  51 {
  52   return __builtin_strncmp ("abc", s, 2) != 0;
  53 }
  54
  55 int main (void)
  56 {
  57   S ss = {{'a','b','c'}, 2};
  58
  59   if (f1 (&ss) != 0 || f2 () != 1 || f3 (&ss) != 0 ||
  60       f4 () != 1 || f5 (&ss) != 0 || f6 () != 0 ||
  61       f7 (&ss) != 0 || f8 () != 0)
  62     __builtin_abort ();
  63
  64   return 0;
  65 }
  66
  67 /* { dg-final { scan-tree-dump-times "cmp_eq \\(" 8 "strlen" } } */