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   /* Member arrays not handled due to the fix for PR 92765.  */
  11   return 0; // __builtin_strcmp (s->s, "abc") != 0;
  12 }
  13
  14 __attribute__ ((noinline)) int
  15 f2 (void)
  16 {
  17   return __builtin_strcmp (s, "abc") != 0;
  18 }
  19
  20 __attribute__ ((noinline)) int
  21 f3 (S *s)
  22 {
  23   return 0; // __builtin_strcmp ("abc", s->s) != 0;
  24 }
  25
  26 __attribute__ ((noinline)) int
  27 f4 (void)
  28 {
  29   return __builtin_strcmp ("abc", s) != 0;
  30 }
  31
  32 __attribute__ ((noinline)) int
  33 f5 (S *s)
  34 {
  35   return 0; // __builtin_strncmp (s->s, "abc", 3) != 0;
  36 }
  37
  38 __attribute__ ((noinline)) int
  39 f6 (void)
  40 {
  41   return __builtin_strncmp (s, "abc", 2) != 0;
  42 }
  43
  44 __attribute__ ((noinline)) int
  45 f7 (S *s)
  46 {
  47   return 0; // __builtin_strncmp ("abc", s->s, 3) != 0;
  48 }
  49
  50 __attribute__ ((noinline)) int
  51 f8 (void)
  52 {
  53   return __builtin_strncmp ("abc", s, 2) != 0;
  54 }
  55
  56 int main (void)
  57 {
  58   S ss = {{'a','b','c'}, 2};
  59
  60   if (f1 (&ss) != 0 || f2 () != 1 || f3 (&ss) != 0 ||
  61       f4 () != 1 || f5 (&ss) != 0 || f6 () != 0 ||
  62       f7 (&ss) != 0 || f8 () != 0)
  63     __builtin_abort ();
  64
  65   return 0;
  66 }
  67
  68 /* { dg-final { scan-tree-dump-times "cmp_eq \\(" 4 "strlen1" } } */