gcc/testsuite/c-c++-common/Wduplicated-branches-1.c

   1 /* PR c/64279 */
   2 /* { dg-do compile } */
   3 /* { dg-options "-Wduplicated-branches -O2" } */
   4
   5 extern void foo (int);
   6 extern int g;
   7 extern int a[10];
   8
   9 int
  10 f (int i, int *p)
  11 {
  12   const int j = 0;
  13   if (j == 0)
  14     {
  15       if (i > 10) /* { dg-warning "this condition has identical branches" } */
  16         /* Optimizers can figure out that this is 1.  */
  17         *p = j * 2 + 1;
  18       else
  19         *p = 1;
  20     }
  21
  22   if (i)
  23     ;
  24   else
  25     ;
  26
  27   if (i == 0) /* { dg-warning "this condition has identical branches" } */
  28     return 0;
  29   else
  30     return 0;
  31
  32   if (i == 1) /* { dg-warning "this condition has identical branches" } */
  33     {
  34       g = 10;
  35     }
  36   else
  37     {
  38       g = 10;
  39     }
  40
  41   const char *s;
  42   if (i == 2) /* { dg-warning "this condition has identical branches" } */
  43     s = "foo";
  44   else
  45     s = "foo";
  46
  47   if (i == 3) /* { dg-warning "this condition has identical branches" } */
  48     g = a[i];
  49   else
  50     g = a[i];
  51
  52   if (i == 4) /* { dg-warning "this condition has identical branches" } */
  53     return i ? 1 : g;
  54   else
  55     return i ? 1 : g;
  56
  57   if (i == 5) /* { dg-warning "this condition has identical branches" } */
  58     {
  59       {
  60         {
  61           {
  62             g++;
  63           }
  64         }
  65       }
  66     }
  67   else
  68     {
  69       {
  70         {
  71           {
  72             g++;
  73           }
  74         }
  75       }
  76     }
  77
  78   if (i == 6) /* { dg-warning "this condition has identical branches" } */
  79     g = i * 6;
  80   else
  81     g = i * 6;
  82
  83   /* Don't warn.  */
  84   if (i == 7)
  85     g = i / 6;
  86   else
  87     g = 6 / i;
  88
  89   if (i == 8) /* { dg-warning "this condition has identical branches" } */
  90     return i * 8 * i * 8;
  91   else
  92     return i * 8 * i * 8;
  93
  94
  95   if (i == 9) /* { dg-warning "this condition has identical branches" } */
  96     {
  97       p++;
  98       return *p;
  99     }
 100   else
 101     {
 102       p++;
 103       return *p;
 104     }
 105
 106   /* Don't warn.  */
 107   if (i == 10)
 108     return *++p;
 109   else
 110     return ++*p;
 111
 112   if (i == 11) /* { dg-warning "this condition has identical branches" } */
 113     {
 114       foo (6);
 115     }
 116   else
 117     {
 118       foo (6);
 119     }
 120
 121   if (i == 12) /* { dg-warning "this condition has identical branches" } */
 122     {
 123       foo (6 + i), foo (2);
 124     }
 125   else
 126     {
 127       foo (6 + i), foo (2);
 128     }
 129
 130   if (i == 13) /* { dg-warning "this condition has identical branches" } */
 131     p += (g + 1);
 132   else
 133     p += (g + 1);
 134
 135   if (i == 14) /* { dg-warning "this condition has identical branches" } */
 136     {
 137       foo (7);
 138       *p = 0;
 139       foo (9);
 140     }
 141   else
 142     {
 143       foo (7);
 144       *p = 0;
 145       foo (9);
 146     }
 147
 148   if (i == 15) /* { dg-warning "this condition has identical branches" } */
 149     p += (g + (1 + 2));
 150   else
 151     p += (g + (1 + 1 + 1));
 152
 153   if (i == 16) /* { dg-warning "this condition has identical branches" } */
 154     foo (10 + g);
 155   else
 156     foo (g + 10);
 157
 158   if (i == 17) /* { dg-warning "this condition has identical branches" } */
 159     ({ foo (i); });
 160   else
 161     ({ foo (i); });
 162
 163   if (i == 18)
 164     {
 165       if (i == 19)
 166         {
 167           if (i == 20) /* { dg-warning "this condition has identical branches" } */
 168             foo (++i);
 169           else
 170             foo (++i);
 171         }
 172     }
 173
 174   /* Don't warn.  */
 175   if (i == 21)
 176     {
 177       foo (1);
 178       foo (2);
 179     }
 180   else
 181     {
 182       foo (2);
 183       foo (1);
 184     }
 185
 186   return 0;
 187 }