library/core/tests/num/wrapping.rs

   1 use core::num::Wrapping;
   2
   3 macro_rules! wrapping_operation {
   4     ($result:expr, $lhs:ident $op:tt $rhs:expr) => {
   5         assert_eq!($result, $lhs $op $rhs);
   6         assert_eq!($result, &$lhs $op $rhs);
   7         assert_eq!($result, $lhs $op &$rhs);
   8         assert_eq!($result, &$lhs $op &$rhs);
   9     };
  10     ($result:expr, $op:tt $expr:expr) => {
  11         assert_eq!($result, $op $expr);
  12         assert_eq!($result, $op &$expr);
  13     };
  14 }
  15
  16 macro_rules! wrapping_assignment {
  17     ($result:expr, $lhs:ident $op:tt $rhs:expr) => {
  18         let mut lhs1 = $lhs;
  19         lhs1 $op $rhs;
  20         assert_eq!($result, lhs1);
  21
  22         let mut lhs2 = $lhs;
  23         lhs2 $op &$rhs;
  24         assert_eq!($result, lhs2);
  25     };
  26 }
  27
  28 macro_rules! wrapping_test {
  29     ($fn_name:ident, $type:ty, $min:expr, $max:expr) => {
  30         #[test]
  31         fn $fn_name() {
  32             let zero: Wrapping<$type> = Wrapping(0);
  33             let one: Wrapping<$type> = Wrapping(1);
  34             let min: Wrapping<$type> = Wrapping($min);
  35             let max: Wrapping<$type> = Wrapping($max);
  36
  37             wrapping_operation!(min, max + one);
  38             wrapping_assignment!(min, max += one);
  39             wrapping_operation!(max, min - one);
  40             wrapping_assignment!(max, min -= one);
  41             wrapping_operation!(max, max * one);
  42             wrapping_assignment!(max, max *= one);
  43             wrapping_operation!(max, max / one);
  44             wrapping_assignment!(max, max /= one);
  45             wrapping_operation!(zero, max % one);
  46             wrapping_assignment!(zero, max %= one);
  47             wrapping_operation!(zero, zero & max);
  48             wrapping_assignment!(zero, zero &= max);
  49             wrapping_operation!(max, zero | max);
  50             wrapping_assignment!(max, zero |= max);
  51             wrapping_operation!(zero, max ^ max);
  52             wrapping_assignment!(zero, max ^= max);
  53             wrapping_operation!(zero, zero << 1usize);
  54             wrapping_assignment!(zero, zero <<= 1usize);
  55             wrapping_operation!(zero, zero >> 1usize);
  56             wrapping_assignment!(zero, zero >>= 1usize);
  57             wrapping_operation!(zero, -zero);
  58             wrapping_operation!(max, !min);
  59         }
  60     };
  61 }
  62
  63 wrapping_test!(test_wrapping_i8, i8, i8::MIN, i8::MAX);
  64 wrapping_test!(test_wrapping_i16, i16, i16::MIN, i16::MAX);
  65 wrapping_test!(test_wrapping_i32, i32, i32::MIN, i32::MAX);
  66 wrapping_test!(test_wrapping_i64, i64, i64::MIN, i64::MAX);
  67 #[cfg(not(target_os = "emscripten"))]
  68 wrapping_test!(test_wrapping_i128, i128, i128::MIN, i128::MAX);
  69 wrapping_test!(test_wrapping_isize, isize, isize::MIN, isize::MAX);
  70 wrapping_test!(test_wrapping_u8, u8, u8::MIN, u8::MAX);
  71 wrapping_test!(test_wrapping_u16, u16, u16::MIN, u16::MAX);
  72 wrapping_test!(test_wrapping_u32, u32, u32::MIN, u32::MAX);
  73 wrapping_test!(test_wrapping_u64, u64, u64::MIN, u64::MAX);
  74 #[cfg(not(target_os = "emscripten"))]
  75 wrapping_test!(test_wrapping_u128, u128, u128::MIN, u128::MAX);
  76 wrapping_test!(test_wrapping_usize, usize, usize::MIN, usize::MAX);
  77
  78 // Don't warn about overflowing ops on 32-bit platforms
  79 #[cfg_attr(target_pointer_width = "32", allow(const_err))]
  80 #[test]
  81 fn wrapping_int_api() {
  82     assert_eq!(i8::MAX.wrapping_add(1), i8::MIN);
  83     assert_eq!(i16::MAX.wrapping_add(1), i16::MIN);
  84     assert_eq!(i32::MAX.wrapping_add(1), i32::MIN);
  85     assert_eq!(i64::MAX.wrapping_add(1), i64::MIN);
  86     assert_eq!(isize::MAX.wrapping_add(1), isize::MIN);
  87
  88     assert_eq!(i8::MIN.wrapping_sub(1), i8::MAX);
  89     assert_eq!(i16::MIN.wrapping_sub(1), i16::MAX);
  90     assert_eq!(i32::MIN.wrapping_sub(1), i32::MAX);
  91     assert_eq!(i64::MIN.wrapping_sub(1), i64::MAX);
  92     assert_eq!(isize::MIN.wrapping_sub(1), isize::MAX);
  93
  94     assert_eq!(u8::MAX.wrapping_add(1), u8::MIN);
  95     assert_eq!(u16::MAX.wrapping_add(1), u16::MIN);
  96     assert_eq!(u32::MAX.wrapping_add(1), u32::MIN);
  97     assert_eq!(u64::MAX.wrapping_add(1), u64::MIN);
  98     assert_eq!(usize::MAX.wrapping_add(1), usize::MIN);
  99
 100     assert_eq!(u8::MIN.wrapping_sub(1), u8::MAX);
 101     assert_eq!(u16::MIN.wrapping_sub(1), u16::MAX);
 102     assert_eq!(u32::MIN.wrapping_sub(1), u32::MAX);
 103     assert_eq!(u64::MIN.wrapping_sub(1), u64::MAX);
 104     assert_eq!(usize::MIN.wrapping_sub(1), usize::MAX);
 105
 106     assert_eq!((0xfe_u8 as i8).wrapping_mul(16), (0xe0_u8 as i8));
 107     assert_eq!((0xfedc_u16 as i16).wrapping_mul(16), (0xedc0_u16 as i16));
 108     assert_eq!((0xfedc_ba98_u32 as i32).wrapping_mul(16), (0xedcb_a980_u32 as i32));
 109     assert_eq!(
 110         (0xfedc_ba98_7654_3217_u64 as i64).wrapping_mul(16),
 111         (0xedcb_a987_6543_2170_u64 as i64)
 112     );
 113
 114     match () {
 115         #[cfg(target_pointer_width = "32")]
 116         () => {
 117             assert_eq!((0xfedc_ba98_u32 as isize).wrapping_mul(16), (0xedcb_a980_u32 as isize));
 118         }
 119         #[cfg(target_pointer_width = "64")]
 120         () => {
 121             assert_eq!(
 122                 (0xfedc_ba98_7654_3217_u64 as isize).wrapping_mul(16),
 123                 (0xedcb_a987_6543_2170_u64 as isize)
 124             );
 125         }
 126     }
 127
 128     assert_eq!((0xfe as u8).wrapping_mul(16), (0xe0 as u8));
 129     assert_eq!((0xfedc as u16).wrapping_mul(16), (0xedc0 as u16));
 130     assert_eq!((0xfedc_ba98 as u32).wrapping_mul(16), (0xedcb_a980 as u32));
 131     assert_eq!((0xfedc_ba98_7654_3217 as u64).wrapping_mul(16), (0xedcb_a987_6543_2170 as u64));
 132
 133     match () {
 134         #[cfg(target_pointer_width = "32")]
 135         () => {
 136             assert_eq!((0xfedc_ba98 as usize).wrapping_mul(16), (0xedcb_a980 as usize));
 137         }
 138         #[cfg(target_pointer_width = "64")]
 139         () => {
 140             assert_eq!(
 141                 (0xfedc_ba98_7654_3217 as usize).wrapping_mul(16),
 142                 (0xedcb_a987_6543_2170 as usize)
 143             );
 144         }
 145     }
 146
 147     macro_rules! check_mul_no_wrap {
 148         ($e:expr, $f:expr) => {
 149             assert_eq!(($e).wrapping_mul($f), ($e) * $f);
 150         };
 151     }
 152     macro_rules! check_mul_wraps {
 153         ($e:expr, $f:expr) => {
 154             assert_eq!(($e).wrapping_mul($f), $e);
 155         };
 156     }
 157
 158     check_mul_no_wrap!(0xfe_u8 as i8, -1);
 159     check_mul_no_wrap!(0xfedc_u16 as i16, -1);
 160     check_mul_no_wrap!(0xfedc_ba98_u32 as i32, -1);
 161     check_mul_no_wrap!(0xfedc_ba98_7654_3217_u64 as i64, -1);
 162     check_mul_no_wrap!(0xfedc_ba98_7654_3217_u64 as u64 as isize, -1);
 163
 164     check_mul_no_wrap!(0xfe_u8 as i8, -2);
 165     check_mul_no_wrap!(0xfedc_u16 as i16, -2);
 166     check_mul_no_wrap!(0xfedc_ba98_u32 as i32, -2);
 167     check_mul_no_wrap!(0xfedc_ba98_7654_3217_u64 as i64, -2);
 168     check_mul_no_wrap!(0xfedc_ba98_fedc_ba98_u64 as u64 as isize, -2);
 169
 170     check_mul_no_wrap!(0xfe_u8 as i8, 2);
 171     check_mul_no_wrap!(0xfedc_u16 as i16, 2);
 172     check_mul_no_wrap!(0xfedc_ba98_u32 as i32, 2);
 173     check_mul_no_wrap!(0xfedc_ba98_7654_3217_u64 as i64, 2);
 174     check_mul_no_wrap!(0xfedc_ba98_fedc_ba98_u64 as u64 as isize, 2);
 175
 176     check_mul_wraps!(0x80_u8 as i8, -1);
 177     check_mul_wraps!(0x8000_u16 as i16, -1);
 178     check_mul_wraps!(0x8000_0000_u32 as i32, -1);
 179     check_mul_wraps!(0x8000_0000_0000_0000_u64 as i64, -1);
 180     match () {
 181         #[cfg(target_pointer_width = "32")]
 182         () => {
 183             check_mul_wraps!(0x8000_0000_u32 as isize, -1);
 184         }
 185         #[cfg(target_pointer_width = "64")]
 186         () => {
 187             check_mul_wraps!(0x8000_0000_0000_0000_u64 as isize, -1);
 188         }
 189     }
 190
 191     macro_rules! check_div_no_wrap {
 192         ($e:expr, $f:expr) => {
 193             assert_eq!(($e).wrapping_div($f), ($e) / $f);
 194         };
 195     }
 196     macro_rules! check_div_wraps {
 197         ($e:expr, $f:expr) => {
 198             assert_eq!(($e).wrapping_div($f), $e);
 199         };
 200     }
 201
 202     check_div_no_wrap!(0xfe_u8 as i8, -1);
 203     check_div_no_wrap!(0xfedc_u16 as i16, -1);
 204     check_div_no_wrap!(0xfedc_ba98_u32 as i32, -1);
 205     check_div_no_wrap!(0xfedc_ba98_7654_3217_u64 as i64, -1);
 206     check_div_no_wrap!(0xfedc_ba98_7654_3217_u64 as u64 as isize, -1);
 207
 208     check_div_no_wrap!(0xfe_u8 as i8, -2);
 209     check_div_no_wrap!(0xfedc_u16 as i16, -2);
 210     check_div_no_wrap!(0xfedc_ba98_u32 as i32, -2);
 211     check_div_no_wrap!(0xfedc_ba98_7654_3217_u64 as i64, -2);
 212     check_div_no_wrap!(0xfedc_ba98_7654_3217_u64 as u64 as isize, -2);
 213
 214     check_div_no_wrap!(0xfe_u8 as i8, 2);
 215     check_div_no_wrap!(0xfedc_u16 as i16, 2);
 216     check_div_no_wrap!(0xfedc_ba98_u32 as i32, 2);
 217     check_div_no_wrap!(0xfedc_ba98_7654_3217_u64 as i64, 2);
 218     check_div_no_wrap!(0xfedc_ba98_7654_3217_u64 as u64 as isize, 2);
 219
 220     check_div_wraps!(-128 as i8, -1);
 221     check_div_wraps!(0x8000_u16 as i16, -1);
 222     check_div_wraps!(0x8000_0000_u32 as i32, -1);
 223     check_div_wraps!(0x8000_0000_0000_0000_u64 as i64, -1);
 224     match () {
 225         #[cfg(target_pointer_width = "32")]
 226         () => {
 227             check_div_wraps!(0x8000_0000_u32 as isize, -1);
 228         }
 229         #[cfg(target_pointer_width = "64")]
 230         () => {
 231             check_div_wraps!(0x8000_0000_0000_0000_u64 as isize, -1);
 232         }
 233     }
 234
 235     macro_rules! check_rem_no_wrap {
 236         ($e:expr, $f:expr) => {
 237             assert_eq!(($e).wrapping_rem($f), ($e) % $f);
 238         };
 239     }
 240     macro_rules! check_rem_wraps {
 241         ($e:expr, $f:expr) => {
 242             assert_eq!(($e).wrapping_rem($f), 0);
 243         };
 244     }
 245
 246     check_rem_no_wrap!(0xfe_u8 as i8, -1);
 247     check_rem_no_wrap!(0xfedc_u16 as i16, -1);
 248     check_rem_no_wrap!(0xfedc_ba98_u32 as i32, -1);
 249     check_rem_no_wrap!(0xfedc_ba98_7654_3217_u64 as i64, -1);
 250     check_rem_no_wrap!(0xfedc_ba98_7654_3217_u64 as u64 as isize, -1);
 251
 252     check_rem_no_wrap!(0xfe_u8 as i8, -2);
 253     check_rem_no_wrap!(0xfedc_u16 as i16, -2);
 254     check_rem_no_wrap!(0xfedc_ba98_u32 as i32, -2);
 255     check_rem_no_wrap!(0xfedc_ba98_7654_3217_u64 as i64, -2);
 256     check_rem_no_wrap!(0xfedc_ba98_7654_3217_u64 as u64 as isize, -2);
 257
 258     check_rem_no_wrap!(0xfe_u8 as i8, 2);
 259     check_rem_no_wrap!(0xfedc_u16 as i16, 2);
 260     check_rem_no_wrap!(0xfedc_ba98_u32 as i32, 2);
 261     check_rem_no_wrap!(0xfedc_ba98_7654_3217_u64 as i64, 2);
 262     check_rem_no_wrap!(0xfedc_ba98_7654_3217_u64 as u64 as isize, 2);
 263
 264     check_rem_wraps!(0x80_u8 as i8, -1);
 265     check_rem_wraps!(0x8000_u16 as i16, -1);
 266     check_rem_wraps!(0x8000_0000_u32 as i32, -1);
 267     check_rem_wraps!(0x8000_0000_0000_0000_u64 as i64, -1);
 268     match () {
 269         #[cfg(target_pointer_width = "32")]
 270         () => {
 271             check_rem_wraps!(0x8000_0000_u32 as isize, -1);
 272         }
 273         #[cfg(target_pointer_width = "64")]
 274         () => {
 275             check_rem_wraps!(0x8000_0000_0000_0000_u64 as isize, -1);
 276         }
 277     }
 278
 279     macro_rules! check_neg_no_wrap {
 280         ($e:expr) => {
 281             assert_eq!(($e).wrapping_neg(), -($e));
 282         };
 283     }
 284     macro_rules! check_neg_wraps {
 285         ($e:expr) => {
 286             assert_eq!(($e).wrapping_neg(), ($e));
 287         };
 288     }
 289
 290     check_neg_no_wrap!(0xfe_u8 as i8);
 291     check_neg_no_wrap!(0xfedc_u16 as i16);
 292     check_neg_no_wrap!(0xfedc_ba98_u32 as i32);
 293     check_neg_no_wrap!(0xfedc_ba98_7654_3217_u64 as i64);
 294     check_neg_no_wrap!(0xfedc_ba98_7654_3217_u64 as u64 as isize);
 295
 296     check_neg_wraps!(0x80_u8 as i8);
 297     check_neg_wraps!(0x8000_u16 as i16);
 298     check_neg_wraps!(0x8000_0000_u32 as i32);
 299     check_neg_wraps!(0x8000_0000_0000_0000_u64 as i64);
 300     match () {
 301         #[cfg(target_pointer_width = "32")]
 302         () => {
 303             check_neg_wraps!(0x8000_0000_u32 as isize);
 304         }
 305         #[cfg(target_pointer_width = "64")]
 306         () => {
 307             check_neg_wraps!(0x8000_0000_0000_0000_u64 as isize);
 308         }
 309     }
 310 }