gcc/testsuite/gcc.dg/pr59846.c

   1 /* PR c/59846 */
   2 /* { dg-do compile } */
   3 /* { dg-options "-Wlogical-op -Wtype-limits" } */
   4
   5 _Bool
   6 fn1 (unsigned int p)
   7 {
   8   return 0ULL > p; /* { dg-warning "15:comparison is always false due to limited range of data type" } */
   9 }
  10
  11 _Bool
  12 fn2 (unsigned int p)
  13 {
  14   return 0ULL <= p; /* { dg-warning "15:comparison is always true due to limited range of data type" } */
  15 }
  16
  17 _Bool
  18 fn3 (unsigned int p)
  19 {
  20   return p >= 0U; /* { dg-warning "12:comparison of unsigned expression in '>= 0' is always true" } */
  21 }
  22
  23 _Bool
  24 fn4 (unsigned int p)
  25 {
  26   return p < 0U; /* { dg-warning "12:comparison of unsigned expression in '< 0' is always false" } */
  27 }
  28
  29 _Bool
  30 fn5 (_Bool p)
  31 {
  32   return p || !p; /* { dg-warning "12:logical" } */
  33 }
  34
  35 _Bool
  36 fn6 (_Bool p)
  37 {
  38   return p && !p; /* { dg-warning "12:logical" } */
  39 }