use core::num::Wrapping; macro_rules! wrapping_operation { ($result:expr, $lhs:ident $op:tt $rhs:expr) => { assert_eq!($result, $lhs $op $rhs); assert_eq!($result, &$lhs $op $rhs); assert_eq!($result, $lhs $op &$rhs); assert_eq!($result, &$lhs $op &$rhs); }; ($result:expr, $op:tt $expr:expr) => { assert_eq!($result, $op $expr); assert_eq!($result, $op &$expr); }; } macro_rules! wrapping_assignment { ($result:expr, $lhs:ident $op:tt $rhs:expr) => { let mut lhs1 = $lhs; lhs1 $op $rhs; assert_eq!($result, lhs1); let mut lhs2 = $lhs; lhs2 $op &$rhs; assert_eq!($result, lhs2); }; } macro_rules! wrapping_test { ($fn_name:ident, $type:ty, $min:expr, $max:expr) => { #[test] fn $fn_name() { let zero: Wrapping<$type> = Wrapping(0); let one: Wrapping<$type> = Wrapping(1); let min: Wrapping<$type> = Wrapping($min); let max: Wrapping<$type> = Wrapping($max); wrapping_operation!(min, max + one); wrapping_assignment!(min, max += one); wrapping_operation!(max, min - one); wrapping_assignment!(max, min -= one); wrapping_operation!(max, max * one); wrapping_assignment!(max, max *= one); wrapping_operation!(max, max / one); wrapping_assignment!(max, max /= one); wrapping_operation!(zero, max % one); wrapping_assignment!(zero, max %= one); wrapping_operation!(zero, zero & max); wrapping_assignment!(zero, zero &= max); wrapping_operation!(max, zero | max); wrapping_assignment!(max, zero |= max); wrapping_operation!(zero, max ^ max); wrapping_assignment!(zero, max ^= max); wrapping_operation!(zero, zero << 1usize); wrapping_assignment!(zero, zero <<= 1usize); wrapping_operation!(zero, zero >> 1usize); wrapping_assignment!(zero, zero >>= 1usize); wrapping_operation!(zero, -zero); wrapping_operation!(max, !min); } }; } wrapping_test!(test_wrapping_i8, i8, i8::MIN, i8::MAX); wrapping_test!(test_wrapping_i16, i16, i16::MIN, i16::MAX); wrapping_test!(test_wrapping_i32, i32, i32::MIN, i32::MAX); wrapping_test!(test_wrapping_i64, i64, i64::MIN, i64::MAX); #[cfg(not(target_os = "emscripten"))] wrapping_test!(test_wrapping_i128, i128, i128::MIN, i128::MAX); wrapping_test!(test_wrapping_isize, isize, isize::MIN, isize::MAX); wrapping_test!(test_wrapping_u8, u8, u8::MIN, u8::MAX); wrapping_test!(test_wrapping_u16, u16, u16::MIN, u16::MAX); wrapping_test!(test_wrapping_u32, u32, u32::MIN, u32::MAX); wrapping_test!(test_wrapping_u64, u64, u64::MIN, u64::MAX); #[cfg(not(target_os = "emscripten"))] wrapping_test!(test_wrapping_u128, u128, u128::MIN, u128::MAX); wrapping_test!(test_wrapping_usize, usize, usize::MIN, usize::MAX); // Don't warn about overflowing ops on 32-bit platforms #[cfg_attr(target_pointer_width = "32", allow(const_err))] #[test] fn wrapping_int_api() { assert_eq!(i8::MAX.wrapping_add(1), i8::MIN); assert_eq!(i16::MAX.wrapping_add(1), i16::MIN); assert_eq!(i32::MAX.wrapping_add(1), i32::MIN); assert_eq!(i64::MAX.wrapping_add(1), i64::MIN); assert_eq!(isize::MAX.wrapping_add(1), isize::MIN); assert_eq!(i8::MIN.wrapping_sub(1), i8::MAX); assert_eq!(i16::MIN.wrapping_sub(1), i16::MAX); assert_eq!(i32::MIN.wrapping_sub(1), i32::MAX); assert_eq!(i64::MIN.wrapping_sub(1), i64::MAX); assert_eq!(isize::MIN.wrapping_sub(1), isize::MAX); assert_eq!(u8::MAX.wrapping_add(1), u8::MIN); assert_eq!(u16::MAX.wrapping_add(1), u16::MIN); assert_eq!(u32::MAX.wrapping_add(1), u32::MIN); assert_eq!(u64::MAX.wrapping_add(1), u64::MIN); assert_eq!(usize::MAX.wrapping_add(1), usize::MIN); assert_eq!(u8::MIN.wrapping_sub(1), u8::MAX); assert_eq!(u16::MIN.wrapping_sub(1), u16::MAX); assert_eq!(u32::MIN.wrapping_sub(1), u32::MAX); assert_eq!(u64::MIN.wrapping_sub(1), u64::MAX); assert_eq!(usize::MIN.wrapping_sub(1), usize::MAX); assert_eq!((0xfe_u8 as i8).wrapping_mul(16), (0xe0_u8 as i8)); assert_eq!((0xfedc_u16 as i16).wrapping_mul(16), (0xedc0_u16 as i16)); assert_eq!((0xfedc_ba98_u32 as i32).wrapping_mul(16), (0xedcb_a980_u32 as i32)); assert_eq!( (0xfedc_ba98_7654_3217_u64 as i64).wrapping_mul(16), (0xedcb_a987_6543_2170_u64 as i64) ); match () { #[cfg(target_pointer_width = "32")] () => { assert_eq!((0xfedc_ba98_u32 as isize).wrapping_mul(16), (0xedcb_a980_u32 as isize)); } #[cfg(target_pointer_width = "64")] () => { assert_eq!( (0xfedc_ba98_7654_3217_u64 as isize).wrapping_mul(16), (0xedcb_a987_6543_2170_u64 as isize) ); } } assert_eq!((0xfe as u8).wrapping_mul(16), (0xe0 as u8)); assert_eq!((0xfedc as u16).wrapping_mul(16), (0xedc0 as u16)); assert_eq!((0xfedc_ba98 as u32).wrapping_mul(16), (0xedcb_a980 as u32)); assert_eq!((0xfedc_ba98_7654_3217 as u64).wrapping_mul(16), (0xedcb_a987_6543_2170 as u64)); match () { #[cfg(target_pointer_width = "32")] () => { assert_eq!((0xfedc_ba98 as usize).wrapping_mul(16), (0xedcb_a980 as usize)); } #[cfg(target_pointer_width = "64")] () => { assert_eq!( (0xfedc_ba98_7654_3217 as usize).wrapping_mul(16), (0xedcb_a987_6543_2170 as usize) ); } } macro_rules! check_mul_no_wrap { ($e:expr, $f:expr) => { assert_eq!(($e).wrapping_mul($f), ($e) * $f); }; } macro_rules! check_mul_wraps { ($e:expr, $f:expr) => { assert_eq!(($e).wrapping_mul($f), $e); }; } check_mul_no_wrap!(0xfe_u8 as i8, -1); check_mul_no_wrap!(0xfedc_u16 as i16, -1); check_mul_no_wrap!(0xfedc_ba98_u32 as i32, -1); check_mul_no_wrap!(0xfedc_ba98_7654_3217_u64 as i64, -1); check_mul_no_wrap!(0xfedc_ba98_7654_3217_u64 as u64 as isize, -1); check_mul_no_wrap!(0xfe_u8 as i8, -2); check_mul_no_wrap!(0xfedc_u16 as i16, -2); check_mul_no_wrap!(0xfedc_ba98_u32 as i32, -2); check_mul_no_wrap!(0xfedc_ba98_7654_3217_u64 as i64, -2); check_mul_no_wrap!(0xfedc_ba98_fedc_ba98_u64 as u64 as isize, -2); check_mul_no_wrap!(0xfe_u8 as i8, 2); check_mul_no_wrap!(0xfedc_u16 as i16, 2); check_mul_no_wrap!(0xfedc_ba98_u32 as i32, 2); check_mul_no_wrap!(0xfedc_ba98_7654_3217_u64 as i64, 2); check_mul_no_wrap!(0xfedc_ba98_fedc_ba98_u64 as u64 as isize, 2); check_mul_wraps!(0x80_u8 as i8, -1); check_mul_wraps!(0x8000_u16 as i16, -1); check_mul_wraps!(0x8000_0000_u32 as i32, -1); check_mul_wraps!(0x8000_0000_0000_0000_u64 as i64, -1); match () { #[cfg(target_pointer_width = "32")] () => { check_mul_wraps!(0x8000_0000_u32 as isize, -1); } #[cfg(target_pointer_width = "64")] () => { check_mul_wraps!(0x8000_0000_0000_0000_u64 as isize, -1); } } macro_rules! check_div_no_wrap { ($e:expr, $f:expr) => { assert_eq!(($e).wrapping_div($f), ($e) / $f); }; } macro_rules! check_div_wraps { ($e:expr, $f:expr) => { assert_eq!(($e).wrapping_div($f), $e); }; } check_div_no_wrap!(0xfe_u8 as i8, -1); check_div_no_wrap!(0xfedc_u16 as i16, -1); check_div_no_wrap!(0xfedc_ba98_u32 as i32, -1); check_div_no_wrap!(0xfedc_ba98_7654_3217_u64 as i64, -1); check_div_no_wrap!(0xfedc_ba98_7654_3217_u64 as u64 as isize, -1); check_div_no_wrap!(0xfe_u8 as i8, -2); check_div_no_wrap!(0xfedc_u16 as i16, -2); check_div_no_wrap!(0xfedc_ba98_u32 as i32, -2); check_div_no_wrap!(0xfedc_ba98_7654_3217_u64 as i64, -2); check_div_no_wrap!(0xfedc_ba98_7654_3217_u64 as u64 as isize, -2); check_div_no_wrap!(0xfe_u8 as i8, 2); check_div_no_wrap!(0xfedc_u16 as i16, 2); check_div_no_wrap!(0xfedc_ba98_u32 as i32, 2); check_div_no_wrap!(0xfedc_ba98_7654_3217_u64 as i64, 2); check_div_no_wrap!(0xfedc_ba98_7654_3217_u64 as u64 as isize, 2); check_div_wraps!(-128 as i8, -1); check_div_wraps!(0x8000_u16 as i16, -1); check_div_wraps!(0x8000_0000_u32 as i32, -1); check_div_wraps!(0x8000_0000_0000_0000_u64 as i64, -1); match () { #[cfg(target_pointer_width = "32")] () => { check_div_wraps!(0x8000_0000_u32 as isize, -1); } #[cfg(target_pointer_width = "64")] () => { check_div_wraps!(0x8000_0000_0000_0000_u64 as isize, -1); } } macro_rules! check_rem_no_wrap { ($e:expr, $f:expr) => { assert_eq!(($e).wrapping_rem($f), ($e) % $f); }; } macro_rules! check_rem_wraps { ($e:expr, $f:expr) => { assert_eq!(($e).wrapping_rem($f), 0); }; } check_rem_no_wrap!(0xfe_u8 as i8, -1); check_rem_no_wrap!(0xfedc_u16 as i16, -1); check_rem_no_wrap!(0xfedc_ba98_u32 as i32, -1); check_rem_no_wrap!(0xfedc_ba98_7654_3217_u64 as i64, -1); check_rem_no_wrap!(0xfedc_ba98_7654_3217_u64 as u64 as isize, -1); check_rem_no_wrap!(0xfe_u8 as i8, -2); check_rem_no_wrap!(0xfedc_u16 as i16, -2); check_rem_no_wrap!(0xfedc_ba98_u32 as i32, -2); check_rem_no_wrap!(0xfedc_ba98_7654_3217_u64 as i64, -2); check_rem_no_wrap!(0xfedc_ba98_7654_3217_u64 as u64 as isize, -2); check_rem_no_wrap!(0xfe_u8 as i8, 2); check_rem_no_wrap!(0xfedc_u16 as i16, 2); check_rem_no_wrap!(0xfedc_ba98_u32 as i32, 2); check_rem_no_wrap!(0xfedc_ba98_7654_3217_u64 as i64, 2); check_rem_no_wrap!(0xfedc_ba98_7654_3217_u64 as u64 as isize, 2); check_rem_wraps!(0x80_u8 as i8, -1); check_rem_wraps!(0x8000_u16 as i16, -1); check_rem_wraps!(0x8000_0000_u32 as i32, -1); check_rem_wraps!(0x8000_0000_0000_0000_u64 as i64, -1); match () { #[cfg(target_pointer_width = "32")] () => { check_rem_wraps!(0x8000_0000_u32 as isize, -1); } #[cfg(target_pointer_width = "64")] () => { check_rem_wraps!(0x8000_0000_0000_0000_u64 as isize, -1); } } macro_rules! check_neg_no_wrap { ($e:expr) => { assert_eq!(($e).wrapping_neg(), -($e)); }; } macro_rules! check_neg_wraps { ($e:expr) => { assert_eq!(($e).wrapping_neg(), ($e)); }; } check_neg_no_wrap!(0xfe_u8 as i8); check_neg_no_wrap!(0xfedc_u16 as i16); check_neg_no_wrap!(0xfedc_ba98_u32 as i32); check_neg_no_wrap!(0xfedc_ba98_7654_3217_u64 as i64); check_neg_no_wrap!(0xfedc_ba98_7654_3217_u64 as u64 as isize); check_neg_wraps!(0x80_u8 as i8); check_neg_wraps!(0x8000_u16 as i16); check_neg_wraps!(0x8000_0000_u32 as i32); check_neg_wraps!(0x8000_0000_0000_0000_u64 as i64); match () { #[cfg(target_pointer_width = "32")] () => { check_neg_wraps!(0x8000_0000_u32 as isize); } #[cfg(target_pointer_width = "64")] () => { check_neg_wraps!(0x8000_0000_0000_0000_u64 as isize); } } } #[test] fn wrapping_const() { // Specifically the wrapping behavior of division and remainder is subtle, // see https://github.com/rust-lang/rust/pull/94512. const _: () = { assert!(i32::MIN.wrapping_div(-1) == i32::MIN); assert!(i32::MIN.wrapping_rem(-1) == 0); }; }