| //@compile-flags: -Coverflow-checks=off |
| #![allow(arithmetic_overflow)] |
| |
| fn basic() { |
| fn ret() -> i64 { |
| 1 |
| } |
| |
| fn neg() -> i64 { |
| -1 |
| } |
| |
| fn add() -> i64 { |
| 1 + 2 |
| } |
| |
| fn indirect_add() -> i64 { |
| let x = 1; |
| let y = 2; |
| x + y |
| } |
| |
| fn arith() -> i32 { |
| 3 * 3 + 4 * 4 |
| } |
| |
| fn match_int() -> i16 { |
| let n = 2; |
| match n { |
| 0 => 0, |
| 1 => 10, |
| 2 => 20, |
| 3 => 30, |
| _ => 100, |
| } |
| } |
| |
| fn match_int_range() -> i64 { |
| let n = 42; |
| match n { |
| 0..=9 => 0, |
| 10..=19 => 1, |
| 20..=29 => 2, |
| 30..=39 => 3, |
| 40..=42 => 4, |
| _ => 5, |
| } |
| } |
| |
| assert_eq!(ret(), 1); |
| assert_eq!(neg(), -1); |
| assert_eq!(add(), 3); |
| assert_eq!(indirect_add(), 3); |
| assert_eq!(arith(), 5 * 5); |
| assert_eq!(match_int(), 20); |
| assert_eq!(match_int_range(), 4); |
| } |
| |
| pub fn main() { |
| basic(); |
| |
| // This tests that we do (not) do sign extension properly when loading integers |
| assert_eq!(u32::MAX as i64, 4294967295); |
| assert_eq!(i32::MIN as i64, -2147483648); |
| |
| assert_eq!(i8::MAX, 127); |
| assert_eq!(i8::MIN, -128); |
| |
| // Shifts with negative offsets are subtle. |
| assert_eq!(13 << -2i8, 13 << 254); |
| assert_eq!(13 << i8::MIN, 13); |
| assert_eq!(13 << -1i16, 13 << u16::MAX); |
| assert_eq!(13 << i16::MIN, 13); |
| assert_eq!(13i128 << -2i8, 13i128 << 254); |
| assert_eq!(13i128 << i8::MIN, 13); |
| assert_eq!(13i128 << -1i16, 13i128 << u16::MAX); |
| assert_eq!(13i128 << i16::MIN, 13); |
| |
| assert_eq!(i32::from_str_radix("A", 16), Ok(10)); |
| |
| let n = -0b1000_0000i8; |
| assert_eq!(n.count_ones(), 1); |
| |
| let n = -0b1000_0000i8; |
| assert_eq!(n.count_zeros(), 7); |
| |
| let n = -1i16; |
| assert_eq!(n.leading_zeros(), 0); |
| |
| let n = -4i8; |
| assert_eq!(n.trailing_zeros(), 2); |
| |
| let n = 0x0123456789ABCDEFi64; |
| let m = -0x76543210FEDCBA99i64; |
| assert_eq!(n.rotate_left(32), m); |
| |
| let n = 0x0123456789ABCDEFi64; |
| let m = -0xFEDCBA987654322i64; |
| assert_eq!(n.rotate_right(4), m); |
| |
| let n = 0x0123456789ABCDEFi64; |
| let m = -0x1032547698BADCFFi64; |
| assert_eq!(n.swap_bytes(), m); |
| |
| let n = 0x0123456789ABCDEFi64; |
| if cfg!(target_endian = "big") { |
| assert_eq!(i64::from_be(n), n) |
| } else { |
| assert_eq!(i64::from_be(n), n.swap_bytes()) |
| } |
| |
| let n = 0x0123456789ABCDEFi64; |
| if cfg!(target_endian = "little") { |
| assert_eq!(i64::from_le(n), n) |
| } else { |
| assert_eq!(i64::from_le(n), n.swap_bytes()) |
| } |
| |
| let n = 0x0123456789ABCDEFi64; |
| if cfg!(target_endian = "big") { |
| assert_eq!(n.to_be(), n) |
| } else { |
| assert_eq!(n.to_be(), n.swap_bytes()) |
| } |
| |
| let n = 0x0123456789ABCDEFi64; |
| if cfg!(target_endian = "little") { |
| assert_eq!(n.to_le(), n) |
| } else { |
| assert_eq!(n.to_le(), n.swap_bytes()) |
| } |
| |
| assert_eq!(7i16.checked_add(32760), Some(32767)); |
| assert_eq!(8i16.checked_add(32760), None); |
| |
| assert_eq!((-127i8).checked_sub(1), Some(-128)); |
| assert_eq!((-128i8).checked_sub(1), None); |
| |
| assert_eq!(6i8.checked_mul(21), Some(126)); |
| assert_eq!(6i8.checked_mul(22), None); |
| |
| assert_eq!((-127i8).checked_div(-1), Some(127)); |
| assert_eq!((-128i8).checked_div(-1), None); |
| assert_eq!((1i8).checked_div(0), None); |
| |
| assert_eq!(5i32.checked_rem(2), Some(1)); |
| assert_eq!(5i32.checked_rem(0), None); |
| assert_eq!(i32::MIN.checked_rem(-1), None); |
| |
| assert_eq!(5i32.checked_neg(), Some(-5)); |
| assert_eq!(i32::MIN.checked_neg(), None); |
| |
| assert_eq!(0x10i32.checked_shl(4), Some(0x100)); |
| assert_eq!(0x10i32.checked_shl(33), None); |
| |
| assert_eq!(0x10i32.checked_shr(4), Some(0x1)); |
| assert_eq!(0x10i32.checked_shr(33), None); |
| |
| assert_eq!((-5i32).checked_abs(), Some(5)); |
| assert_eq!(i32::MIN.checked_abs(), None); |
| |
| assert_eq!(100i8.saturating_add(1), 101); |
| assert_eq!(100i8.saturating_add(127), 127); |
| |
| assert_eq!(100i8.saturating_sub(127), -27); |
| assert_eq!((-100i8).saturating_sub(127), -128); |
| |
| assert_eq!(100i32.saturating_mul(127), 12700); |
| assert_eq!((1i32 << 23).saturating_mul(1 << 23), i32::MAX); |
| assert_eq!((-1i32 << 23).saturating_mul(1 << 23), i32::MIN); |
| |
| assert_eq!(100i8.wrapping_add(27), 127); |
| assert_eq!(100i8.wrapping_add(127), -29); |
| |
| assert_eq!(0i8.wrapping_sub(127), -127); |
| assert_eq!((-2i8).wrapping_sub(127), 127); |
| |
| assert_eq!(10i8.wrapping_mul(12), 120); |
| assert_eq!(11i8.wrapping_mul(12), -124); |
| |
| assert_eq!(100u8.wrapping_div(10), 10); |
| assert_eq!((-128i8).wrapping_div(-1), -128); |
| |
| assert_eq!(100i8.wrapping_rem(10), 0); |
| assert_eq!((-128i8).wrapping_rem(-1), 0); |
| |
| assert_eq!(i32::MIN.wrapping_div(-1), i32::MIN); |
| assert_eq!(i32::MIN.wrapping_rem(-1), 0); |
| |
| assert_eq!(100i8.wrapping_neg(), -100); |
| assert_eq!((-128i8).wrapping_neg(), -128); |
| |
| assert_eq!((-1i8).wrapping_shl(7), -128); |
| assert_eq!((-1i8).wrapping_shl(8), -1); |
| |
| assert_eq!((-128i8).wrapping_shr(7), -1); |
| assert_eq!((-128i8).wrapping_shr(8), -128); |
| |
| assert_eq!(100i8.wrapping_abs(), 100); |
| assert_eq!((-100i8).wrapping_abs(), 100); |
| assert_eq!((-128i8).wrapping_abs(), -128); |
| assert_eq!((-128i8).wrapping_abs() as u8, 128); |
| |
| assert_eq!(5i32.overflowing_add(2), (7, false)); |
| assert_eq!(i32::MAX.overflowing_add(1), (i32::MIN, true)); |
| |
| assert_eq!(5i32.overflowing_sub(2), (3, false)); |
| assert_eq!(i32::MIN.overflowing_sub(1), (i32::MAX, true)); |
| |
| assert_eq!(5i32.overflowing_mul(2), (10, false)); |
| assert_eq!(1_000_000_000i32.overflowing_mul(10), (1410065408, true)); |
| assert_eq!(i64::MIN.overflowing_mul(-1), (i64::MIN, true)); |
| assert_eq!(i32::MIN.overflowing_mul(-1), (i32::MIN, true)); |
| assert_eq!(i16::MIN.overflowing_mul(-1), (i16::MIN, true)); |
| assert_eq!(i8::MIN.overflowing_mul(-1), (i8::MIN, true)); |
| |
| assert_eq!(5i32.overflowing_div(2), (2, false)); |
| assert_eq!(i32::MIN.overflowing_div(-1), (i32::MIN, true)); |
| |
| assert_eq!(5i32.overflowing_rem(2), (1, false)); |
| assert_eq!(i32::MIN.overflowing_rem(-1), (0, true)); |
| |
| assert_eq!(2i32.overflowing_neg(), (-2, false)); |
| assert_eq!(i32::MIN.overflowing_neg(), (i32::MIN, true)); |
| |
| assert_eq!(0x10i32.overflowing_shl(4), (0x100, false)); |
| assert_eq!(0x10i32.overflowing_shl(36), (0x100, true)); |
| |
| assert_eq!(0x10i32.overflowing_shr(4), (0x1, false)); |
| assert_eq!(0x10i32.overflowing_shr(36), (0x1, true)); |
| |
| assert_eq!(10i8.overflowing_abs(), (10, false)); |
| assert_eq!((-10i8).overflowing_abs(), (10, false)); |
| assert_eq!((-128i8).overflowing_abs(), (-128, true)); |
| |
| // Logarithms |
| macro_rules! test_log { |
| ($type:ident, $max_log2:expr, $max_log10:expr) => { |
| assert_eq!($type::MIN.checked_ilog2(), None); |
| assert_eq!($type::MIN.checked_ilog10(), None); |
| assert_eq!($type::MAX.checked_ilog2(), Some($max_log2)); |
| assert_eq!($type::MAX.checked_ilog10(), Some($max_log10)); |
| assert_eq!($type::MAX.ilog2(), $max_log2); |
| assert_eq!($type::MAX.ilog10(), $max_log10); |
| }; |
| } |
| |
| test_log!(i8, 6, 2); |
| test_log!(u8, 7, 2); |
| test_log!(i16, 14, 4); |
| test_log!(u16, 15, 4); |
| test_log!(i32, 30, 9); |
| test_log!(u32, 31, 9); |
| test_log!(i64, 62, 18); |
| test_log!(u64, 63, 19); |
| test_log!(i128, 126, 38); |
| test_log!(u128, 127, 38); |
| |
| for i in (1..=i16::MAX).step_by(i8::MAX as usize) { |
| assert_eq!(i.checked_ilog(13), Some((i as f32).log(13.0) as u32)); |
| } |
| for i in (1..=u16::MAX).step_by(i8::MAX as usize) { |
| assert_eq!(i.checked_ilog(13), Some((i as f32).log(13.0) as u32)); |
| } |
| } |
