| #![feature(stmt_expr_attributes)] |
| #![feature(round_ties_even)] |
| #![allow(arithmetic_overflow)] |
| use std::fmt::Debug; |
| use std::hint::black_box; |
| |
| fn main() { |
| basic(); |
| casts(); |
| more_casts(); |
| ops(); |
| nan_casts(); |
| rounding(); |
| } |
| |
| // Helper function to avoid promotion so that this tests "run-time" casts, not CTFE. |
| // Doesn't make a big difference when running this in Miri, but it means we can compare this |
| // with the LLVM backend by running `rustc -Zmir-opt-level=0 -Zsaturating-float-casts`. |
| #[track_caller] |
| #[inline(never)] |
| fn assert_eq<T: PartialEq + Debug>(x: T, y: T) { |
| assert_eq!(x, y); |
| } |
| |
| trait FloatToInt<Int>: Copy { |
| fn cast(self) -> Int; |
| unsafe fn cast_unchecked(self) -> Int; |
| } |
| |
| impl FloatToInt<i8> for f32 { |
| fn cast(self) -> i8 { |
| self as _ |
| } |
| unsafe fn cast_unchecked(self) -> i8 { |
| self.to_int_unchecked() |
| } |
| } |
| impl FloatToInt<i32> for f32 { |
| fn cast(self) -> i32 { |
| self as _ |
| } |
| unsafe fn cast_unchecked(self) -> i32 { |
| self.to_int_unchecked() |
| } |
| } |
| impl FloatToInt<u32> for f32 { |
| fn cast(self) -> u32 { |
| self as _ |
| } |
| unsafe fn cast_unchecked(self) -> u32 { |
| self.to_int_unchecked() |
| } |
| } |
| impl FloatToInt<i64> for f32 { |
| fn cast(self) -> i64 { |
| self as _ |
| } |
| unsafe fn cast_unchecked(self) -> i64 { |
| self.to_int_unchecked() |
| } |
| } |
| impl FloatToInt<u64> for f32 { |
| fn cast(self) -> u64 { |
| self as _ |
| } |
| unsafe fn cast_unchecked(self) -> u64 { |
| self.to_int_unchecked() |
| } |
| } |
| |
| impl FloatToInt<i8> for f64 { |
| fn cast(self) -> i8 { |
| self as _ |
| } |
| unsafe fn cast_unchecked(self) -> i8 { |
| self.to_int_unchecked() |
| } |
| } |
| impl FloatToInt<i32> for f64 { |
| fn cast(self) -> i32 { |
| self as _ |
| } |
| unsafe fn cast_unchecked(self) -> i32 { |
| self.to_int_unchecked() |
| } |
| } |
| impl FloatToInt<u32> for f64 { |
| fn cast(self) -> u32 { |
| self as _ |
| } |
| unsafe fn cast_unchecked(self) -> u32 { |
| self.to_int_unchecked() |
| } |
| } |
| impl FloatToInt<i64> for f64 { |
| fn cast(self) -> i64 { |
| self as _ |
| } |
| unsafe fn cast_unchecked(self) -> i64 { |
| self.to_int_unchecked() |
| } |
| } |
| impl FloatToInt<u64> for f64 { |
| fn cast(self) -> u64 { |
| self as _ |
| } |
| unsafe fn cast_unchecked(self) -> u64 { |
| self.to_int_unchecked() |
| } |
| } |
| impl FloatToInt<i128> for f64 { |
| fn cast(self) -> i128 { |
| self as _ |
| } |
| unsafe fn cast_unchecked(self) -> i128 { |
| self.to_int_unchecked() |
| } |
| } |
| impl FloatToInt<u128> for f64 { |
| fn cast(self) -> u128 { |
| self as _ |
| } |
| unsafe fn cast_unchecked(self) -> u128 { |
| self.to_int_unchecked() |
| } |
| } |
| |
| /// Test this cast both via `as` and via `approx_unchecked` (i.e., it must not saturate). |
| #[track_caller] |
| #[inline(never)] |
| fn test_both_cast<F, I>(x: F, y: I) |
| where |
| F: FloatToInt<I>, |
| I: PartialEq + Debug, |
| { |
| assert_eq!(x.cast(), y); |
| assert_eq!(unsafe { x.cast_unchecked() }, y); |
| } |
| |
| fn basic() { |
| // basic arithmetic |
| assert_eq(6.0_f32 * 6.0_f32, 36.0_f32); |
| assert_eq(6.0_f64 * 6.0_f64, 36.0_f64); |
| assert_eq(-{ 5.0_f32 }, -5.0_f32); |
| assert_eq(-{ 5.0_f64 }, -5.0_f64); |
| // infinities, NaN |
| assert!((5.0_f32 / 0.0).is_infinite()); |
| assert_ne!({ 5.0_f32 / 0.0 }, { -5.0_f32 / 0.0 }); |
| assert!((5.0_f64 / 0.0).is_infinite()); |
| assert_ne!({ 5.0_f64 / 0.0 }, { 5.0_f64 / -0.0 }); |
| assert!((-5.0_f32).sqrt().is_nan()); |
| assert!((-5.0_f64).sqrt().is_nan()); |
| assert_ne!(f32::NAN, f32::NAN); |
| assert_ne!(f64::NAN, f64::NAN); |
| // negative zero |
| let posz = 0.0f32; |
| let negz = -0.0f32; |
| assert_eq(posz, negz); |
| assert_ne!(posz.to_bits(), negz.to_bits()); |
| let posz = 0.0f64; |
| let negz = -0.0f64; |
| assert_eq(posz, negz); |
| assert_ne!(posz.to_bits(), negz.to_bits()); |
| // byte-level transmute |
| let x: u64 = unsafe { std::mem::transmute(42.0_f64) }; |
| let y: f64 = unsafe { std::mem::transmute(x) }; |
| assert_eq(y, 42.0_f64); |
| let x: u32 = unsafe { std::mem::transmute(42.0_f32) }; |
| let y: f32 = unsafe { std::mem::transmute(x) }; |
| assert_eq(y, 42.0_f32); |
| |
| // `%` sign behavior, some of this used to be buggy |
| assert!((black_box(1.0f32) % 1.0).is_sign_positive()); |
| assert!((black_box(1.0f32) % -1.0).is_sign_positive()); |
| assert!((black_box(-1.0f32) % 1.0).is_sign_negative()); |
| assert!((black_box(-1.0f32) % -1.0).is_sign_negative()); |
| assert!((black_box(1.0f64) % 1.0).is_sign_positive()); |
| assert!((black_box(1.0f64) % -1.0).is_sign_positive()); |
| assert!((black_box(-1.0f64) % 1.0).is_sign_negative()); |
| assert!((black_box(-1.0f64) % -1.0).is_sign_negative()); |
| } |
| |
| /// Many of these test values are taken from |
| /// https://github.com/WebAssembly/testsuite/blob/master/conversions.wast. |
| fn casts() { |
| // f32 -> i8 |
| test_both_cast::<f32, i8>(127.99, 127); |
| test_both_cast::<f32, i8>(-128.99, -128); |
| |
| // f32 -> i32 |
| test_both_cast::<f32, i32>(0.0, 0); |
| test_both_cast::<f32, i32>(-0.0, 0); |
| test_both_cast::<f32, i32>(/*0x1p-149*/ f32::from_bits(0x00000001), 0); |
| test_both_cast::<f32, i32>(/*-0x1p-149*/ f32::from_bits(0x80000001), 0); |
| test_both_cast::<f32, i32>(/*0x1.19999ap+0*/ f32::from_bits(0x3f8ccccd), 1); |
| test_both_cast::<f32, i32>(/*-0x1.19999ap+0*/ f32::from_bits(0xbf8ccccd), -1); |
| test_both_cast::<f32, i32>(1.9, 1); |
| test_both_cast::<f32, i32>(-1.9, -1); |
| test_both_cast::<f32, i32>(5.0, 5); |
| test_both_cast::<f32, i32>(-5.0, -5); |
| test_both_cast::<f32, i32>(2147483520.0, 2147483520); |
| test_both_cast::<f32, i32>(-2147483648.0, -2147483648); |
| // unrepresentable casts |
| assert_eq::<i32>(2147483648.0f32 as i32, i32::MAX); |
| assert_eq::<i32>(-2147483904.0f32 as i32, i32::MIN); |
| assert_eq::<i32>(f32::MAX as i32, i32::MAX); |
| assert_eq::<i32>(f32::MIN as i32, i32::MIN); |
| assert_eq::<i32>(f32::INFINITY as i32, i32::MAX); |
| assert_eq::<i32>(f32::NEG_INFINITY as i32, i32::MIN); |
| assert_eq::<i32>(f32::NAN as i32, 0); |
| assert_eq::<i32>((-f32::NAN) as i32, 0); |
| |
| // f32 -> u32 |
| test_both_cast::<f32, u32>(0.0, 0); |
| test_both_cast::<f32, u32>(-0.0, 0); |
| test_both_cast::<f32, u32>(-0.9999999, 0); |
| test_both_cast::<f32, u32>(/*0x1p-149*/ f32::from_bits(0x1), 0); |
| test_both_cast::<f32, u32>(/*-0x1p-149*/ f32::from_bits(0x80000001), 0); |
| test_both_cast::<f32, u32>(/*0x1.19999ap+0*/ f32::from_bits(0x3f8ccccd), 1); |
| test_both_cast::<f32, u32>(1.9, 1); |
| test_both_cast::<f32, u32>(5.0, 5); |
| test_both_cast::<f32, u32>(2147483648.0, 0x8000_0000); |
| test_both_cast::<f32, u32>(4294967040.0, 0u32.wrapping_sub(256)); |
| test_both_cast::<f32, u32>(/*-0x1.ccccccp-1*/ f32::from_bits(0xbf666666), 0); |
| test_both_cast::<f32, u32>(/*-0x1.fffffep-1*/ f32::from_bits(0xbf7fffff), 0); |
| test_both_cast::<f32, u32>((u32::MAX - 128) as f32, u32::MAX - 255); // rounding loss |
| // unrepresentable casts |
| assert_eq::<u32>((u32::MAX - 127) as f32 as u32, u32::MAX); // rounds up and then becomes unrepresentable |
| assert_eq::<u32>(4294967296.0f32 as u32, u32::MAX); |
| assert_eq::<u32>(-5.0f32 as u32, 0); |
| assert_eq::<u32>(f32::MAX as u32, u32::MAX); |
| assert_eq::<u32>(f32::MIN as u32, 0); |
| assert_eq::<u32>(f32::INFINITY as u32, u32::MAX); |
| assert_eq::<u32>(f32::NEG_INFINITY as u32, 0); |
| assert_eq::<u32>(f32::NAN as u32, 0); |
| assert_eq::<u32>((-f32::NAN) as u32, 0); |
| |
| // f32 -> i64 |
| test_both_cast::<f32, i64>(4294967296.0, 4294967296); |
| test_both_cast::<f32, i64>(-4294967296.0, -4294967296); |
| test_both_cast::<f32, i64>(9223371487098961920.0, 9223371487098961920); |
| test_both_cast::<f32, i64>(-9223372036854775808.0, -9223372036854775808); |
| |
| // f64 -> i8 |
| test_both_cast::<f64, i8>(127.99, 127); |
| test_both_cast::<f64, i8>(-128.99, -128); |
| |
| // f64 -> i32 |
| test_both_cast::<f64, i32>(0.0, 0); |
| test_both_cast::<f64, i32>(-0.0, 0); |
| test_both_cast::<f64, i32>(/*0x1.199999999999ap+0*/ f64::from_bits(0x3ff199999999999a), 1); |
| test_both_cast::<f64, i32>( |
| /*-0x1.199999999999ap+0*/ f64::from_bits(0xbff199999999999a), |
| -1, |
| ); |
| test_both_cast::<f64, i32>(1.9, 1); |
| test_both_cast::<f64, i32>(-1.9, -1); |
| test_both_cast::<f64, i32>(1e8, 100_000_000); |
| test_both_cast::<f64, i32>(2147483647.0, 2147483647); |
| test_both_cast::<f64, i32>(-2147483648.0, -2147483648); |
| // unrepresentable casts |
| assert_eq::<i32>(2147483648.0f64 as i32, i32::MAX); |
| assert_eq::<i32>(-2147483649.0f64 as i32, i32::MIN); |
| |
| // f64 -> i64 |
| test_both_cast::<f64, i64>(0.0, 0); |
| test_both_cast::<f64, i64>(-0.0, 0); |
| test_both_cast::<f64, i64>(/*0x0.0000000000001p-1022*/ f64::from_bits(0x1), 0); |
| test_both_cast::<f64, i64>( |
| /*-0x0.0000000000001p-1022*/ f64::from_bits(0x8000000000000001), |
| 0, |
| ); |
| test_both_cast::<f64, i64>(/*0x1.199999999999ap+0*/ f64::from_bits(0x3ff199999999999a), 1); |
| test_both_cast::<f64, i64>( |
| /*-0x1.199999999999ap+0*/ f64::from_bits(0xbff199999999999a), |
| -1, |
| ); |
| test_both_cast::<f64, i64>(5.0, 5); |
| test_both_cast::<f64, i64>(5.9, 5); |
| test_both_cast::<f64, i64>(-5.0, -5); |
| test_both_cast::<f64, i64>(-5.9, -5); |
| test_both_cast::<f64, i64>(4294967296.0, 4294967296); |
| test_both_cast::<f64, i64>(-4294967296.0, -4294967296); |
| test_both_cast::<f64, i64>(9223372036854774784.0, 9223372036854774784); |
| test_both_cast::<f64, i64>(-9223372036854775808.0, -9223372036854775808); |
| // unrepresentable casts |
| assert_eq::<i64>(9223372036854775808.0f64 as i64, i64::MAX); |
| assert_eq::<i64>(-9223372036854777856.0f64 as i64, i64::MIN); |
| assert_eq::<i64>(f64::MAX as i64, i64::MAX); |
| assert_eq::<i64>(f64::MIN as i64, i64::MIN); |
| assert_eq::<i64>(f64::INFINITY as i64, i64::MAX); |
| assert_eq::<i64>(f64::NEG_INFINITY as i64, i64::MIN); |
| assert_eq::<i64>(f64::NAN as i64, 0); |
| assert_eq::<i64>((-f64::NAN) as i64, 0); |
| |
| // f64 -> u64 |
| test_both_cast::<f64, u64>(0.0, 0); |
| test_both_cast::<f64, u64>(-0.0, 0); |
| test_both_cast::<f64, u64>(-0.99999999999, 0); |
| test_both_cast::<f64, u64>(5.0, 5); |
| test_both_cast::<f64, u64>(1e16, 10000000000000000); |
| test_both_cast::<f64, u64>((u64::MAX - 1024) as f64, u64::MAX - 2047); // rounding loss |
| test_both_cast::<f64, u64>(9223372036854775808.0, 9223372036854775808); |
| // unrepresentable casts |
| assert_eq::<u64>(-5.0f64 as u64, 0); |
| assert_eq::<u64>((u64::MAX - 1023) as f64 as u64, u64::MAX); // rounds up and then becomes unrepresentable |
| assert_eq::<u64>(18446744073709551616.0f64 as u64, u64::MAX); |
| assert_eq::<u64>(f64::MAX as u64, u64::MAX); |
| assert_eq::<u64>(f64::MIN as u64, 0); |
| assert_eq::<u64>(f64::INFINITY as u64, u64::MAX); |
| assert_eq::<u64>(f64::NEG_INFINITY as u64, 0); |
| assert_eq::<u64>(f64::NAN as u64, 0); |
| assert_eq::<u64>((-f64::NAN) as u64, 0); |
| |
| // f64 -> i128 |
| assert_eq::<i128>(f64::MAX as i128, i128::MAX); |
| assert_eq::<i128>(f64::MIN as i128, i128::MIN); |
| |
| // f64 -> u128 |
| assert_eq::<u128>(f64::MAX as u128, u128::MAX); |
| assert_eq::<u128>(f64::MIN as u128, 0); |
| |
| // int -> f32 |
| assert_eq::<f32>(127i8 as f32, 127.0); |
| assert_eq::<f32>(2147483647i32 as f32, 2147483648.0); |
| assert_eq::<f32>((-2147483648i32) as f32, -2147483648.0); |
| assert_eq::<f32>(1234567890i32 as f32, /*0x1.26580cp+30*/ f32::from_bits(0x4e932c06)); |
| assert_eq::<f32>(16777217i32 as f32, 16777216.0); |
| assert_eq::<f32>((-16777217i32) as f32, -16777216.0); |
| assert_eq::<f32>(16777219i32 as f32, 16777220.0); |
| assert_eq::<f32>((-16777219i32) as f32, -16777220.0); |
| assert_eq::<f32>( |
| 0x7fffff4000000001i64 as f32, |
| /*0x1.fffffep+62*/ f32::from_bits(0x5effffff), |
| ); |
| assert_eq::<f32>( |
| 0x8000004000000001u64 as i64 as f32, |
| /*-0x1.fffffep+62*/ f32::from_bits(0xdeffffff), |
| ); |
| assert_eq::<f32>( |
| 0x0020000020000001i64 as f32, |
| /*0x1.000002p+53*/ f32::from_bits(0x5a000001), |
| ); |
| assert_eq::<f32>( |
| 0xffdfffffdfffffffu64 as i64 as f32, |
| /*-0x1.000002p+53*/ f32::from_bits(0xda000001), |
| ); |
| assert_eq::<f32>(i128::MIN as f32, -170141183460469231731687303715884105728.0f32); |
| assert_eq::<f32>(u128::MAX as f32, f32::INFINITY); // saturation |
| |
| // int -> f64 |
| assert_eq::<f64>(127i8 as f64, 127.0); |
| assert_eq::<f64>(i16::MIN as f64, -32768.0f64); |
| assert_eq::<f64>(2147483647i32 as f64, 2147483647.0); |
| assert_eq::<f64>(-2147483648i32 as f64, -2147483648.0); |
| assert_eq::<f64>(987654321i32 as f64, 987654321.0); |
| assert_eq::<f64>(9223372036854775807i64 as f64, 9223372036854775807.0); |
| assert_eq::<f64>(-9223372036854775808i64 as f64, -9223372036854775808.0); |
| assert_eq::<f64>(4669201609102990i64 as f64, 4669201609102990.0); // Feigenbaum (?) |
| assert_eq::<f64>(9007199254740993i64 as f64, 9007199254740992.0); |
| assert_eq::<f64>(-9007199254740993i64 as f64, -9007199254740992.0); |
| assert_eq::<f64>(9007199254740995i64 as f64, 9007199254740996.0); |
| assert_eq::<f64>(-9007199254740995i64 as f64, -9007199254740996.0); |
| assert_eq::<f64>(u128::MAX as f64, 340282366920938463463374607431768211455.0f64); // even that fits... |
| |
| // f32 -> f64 |
| assert_eq::<u64>((0.0f32 as f64).to_bits(), 0.0f64.to_bits()); |
| assert_eq::<u64>(((-0.0f32) as f64).to_bits(), (-0.0f64).to_bits()); |
| assert_eq::<f64>(5.0f32 as f64, 5.0f64); |
| assert_eq::<f64>( |
| /*0x1p-149*/ f32::from_bits(0x1) as f64, |
| /*0x1p-149*/ f64::from_bits(0x36a0000000000000), |
| ); |
| assert_eq::<f64>( |
| /*-0x1p-149*/ f32::from_bits(0x80000001) as f64, |
| /*-0x1p-149*/ f64::from_bits(0xb6a0000000000000), |
| ); |
| assert_eq::<f64>( |
| /*0x1.fffffep+127*/ f32::from_bits(0x7f7fffff) as f64, |
| /*0x1.fffffep+127*/ f64::from_bits(0x47efffffe0000000), |
| ); |
| assert_eq::<f64>( |
| /*-0x1.fffffep+127*/ (-f32::from_bits(0x7f7fffff)) as f64, |
| /*-0x1.fffffep+127*/ -f64::from_bits(0x47efffffe0000000), |
| ); |
| assert_eq::<f64>( |
| /*0x1p-119*/ f32::from_bits(0x4000000) as f64, |
| /*0x1p-119*/ f64::from_bits(0x3880000000000000), |
| ); |
| assert_eq::<f64>( |
| /*0x1.8f867ep+125*/ f32::from_bits(0x7e47c33f) as f64, |
| 6.6382536710104395e+37, |
| ); |
| assert_eq::<f64>(f32::INFINITY as f64, f64::INFINITY); |
| assert_eq::<f64>(f32::NEG_INFINITY as f64, f64::NEG_INFINITY); |
| |
| // f64 -> f32 |
| assert_eq::<u32>((0.0f64 as f32).to_bits(), 0.0f32.to_bits()); |
| assert_eq::<u32>(((-0.0f64) as f32).to_bits(), (-0.0f32).to_bits()); |
| assert_eq::<f32>(5.0f64 as f32, 5.0f32); |
| assert_eq::<f32>(/*0x0.0000000000001p-1022*/ f64::from_bits(0x1) as f32, 0.0); |
| assert_eq::<f32>(/*-0x0.0000000000001p-1022*/ (-f64::from_bits(0x1)) as f32, -0.0); |
| assert_eq::<f32>( |
| /*0x1.fffffe0000000p-127*/ f64::from_bits(0x380fffffe0000000) as f32, |
| /*0x1p-149*/ f32::from_bits(0x800000), |
| ); |
| assert_eq::<f32>( |
| /*0x1.4eae4f7024c7p+108*/ f64::from_bits(0x46b4eae4f7024c70) as f32, |
| /*0x1.4eae5p+108*/ f32::from_bits(0x75a75728), |
| ); |
| assert_eq::<f32>(f64::MAX as f32, f32::INFINITY); |
| assert_eq::<f32>(f64::MIN as f32, f32::NEG_INFINITY); |
| assert_eq::<f32>(f64::INFINITY as f32, f32::INFINITY); |
| assert_eq::<f32>(f64::NEG_INFINITY as f32, f32::NEG_INFINITY); |
| } |
| |
| fn ops() { |
| // f32 min/max |
| assert_eq((1.0 as f32).max(-1.0), 1.0); |
| assert_eq((1.0 as f32).min(-1.0), -1.0); |
| assert_eq(f32::NAN.min(9.0), 9.0); |
| assert_eq(f32::NAN.max(-9.0), -9.0); |
| assert_eq((9.0 as f32).min(f32::NAN), 9.0); |
| assert_eq((-9.0 as f32).max(f32::NAN), -9.0); |
| |
| // f64 min/max |
| assert_eq((1.0 as f64).max(-1.0), 1.0); |
| assert_eq((1.0 as f64).min(-1.0), -1.0); |
| assert_eq(f64::NAN.min(9.0), 9.0); |
| assert_eq(f64::NAN.max(-9.0), -9.0); |
| assert_eq((9.0 as f64).min(f64::NAN), 9.0); |
| assert_eq((-9.0 as f64).max(f64::NAN), -9.0); |
| |
| // f32 copysign |
| assert_eq(3.5_f32.copysign(0.42), 3.5_f32); |
| assert_eq(3.5_f32.copysign(-0.42), -3.5_f32); |
| assert_eq((-3.5_f32).copysign(0.42), 3.5_f32); |
| assert_eq((-3.5_f32).copysign(-0.42), -3.5_f32); |
| assert!(f32::NAN.copysign(1.0).is_nan()); |
| |
| // f64 copysign |
| assert_eq(3.5_f64.copysign(0.42), 3.5_f64); |
| assert_eq(3.5_f64.copysign(-0.42), -3.5_f64); |
| assert_eq((-3.5_f64).copysign(0.42), 3.5_f64); |
| assert_eq((-3.5_f64).copysign(-0.42), -3.5_f64); |
| assert!(f64::NAN.copysign(1.0).is_nan()); |
| } |
| |
| /// Tests taken from rustc test suite. |
| /// |
| |
| macro_rules! test { |
| ($val:expr, $src_ty:ident -> $dest_ty:ident, $expected:expr) => ( |
| // black_box disables constant evaluation to test run-time conversions: |
| assert_eq!(black_box::<$src_ty>($val) as $dest_ty, $expected, |
| "run-time {} -> {}", stringify!($src_ty), stringify!($dest_ty)); |
| |
| { |
| const X: $src_ty = $val; |
| const Y: $dest_ty = X as $dest_ty; |
| assert_eq!(Y, $expected, |
| "const eval {} -> {}", stringify!($src_ty), stringify!($dest_ty)); |
| } |
| ); |
| |
| ($fval:expr, f* -> $ity:ident, $ival:expr) => ( |
| test!($fval, f32 -> $ity, $ival); |
| test!($fval, f64 -> $ity, $ival); |
| ) |
| } |
| |
| macro_rules! common_fptoi_tests { |
| ($fty:ident -> $($ity:ident)+) => ({ $( |
| test!($fty::NAN, $fty -> $ity, 0); |
| test!($fty::INFINITY, $fty -> $ity, $ity::MAX); |
| test!($fty::NEG_INFINITY, $fty -> $ity, $ity::MIN); |
| // These two tests are not solely float->int tests, in particular the latter relies on |
| // `u128::MAX as f32` not being UB. But that's okay, since this file tests int->float |
| // as well, the test is just slightly misplaced. |
| test!($ity::MIN as $fty, $fty -> $ity, $ity::MIN); |
| test!($ity::MAX as $fty, $fty -> $ity, $ity::MAX); |
| test!(0., $fty -> $ity, 0); |
| test!($fty::MIN_POSITIVE, $fty -> $ity, 0); |
| test!(-0.9, $fty -> $ity, 0); |
| test!(1., $fty -> $ity, 1); |
| test!(42., $fty -> $ity, 42); |
| )+ }); |
| |
| (f* -> $($ity:ident)+) => ({ |
| common_fptoi_tests!(f32 -> $($ity)+); |
| common_fptoi_tests!(f64 -> $($ity)+); |
| }) |
| } |
| |
| macro_rules! fptoui_tests { |
| ($fty: ident -> $($ity: ident)+) => ({ $( |
| test!(-0., $fty -> $ity, 0); |
| test!(-$fty::MIN_POSITIVE, $fty -> $ity, 0); |
| test!(-0.99999994, $fty -> $ity, 0); |
| test!(-1., $fty -> $ity, 0); |
| test!(-100., $fty -> $ity, 0); |
| test!(#[allow(overflowing_literals)] -1e50, $fty -> $ity, 0); |
| test!(#[allow(overflowing_literals)] -1e130, $fty -> $ity, 0); |
| )+ }); |
| |
| (f* -> $($ity:ident)+) => ({ |
| fptoui_tests!(f32 -> $($ity)+); |
| fptoui_tests!(f64 -> $($ity)+); |
| }) |
| } |
| |
| fn more_casts() { |
| common_fptoi_tests!(f* -> i8 i16 i32 i64 u8 u16 u32 u64); |
| fptoui_tests!(f* -> u8 u16 u32 u64); |
| common_fptoi_tests!(f* -> i128 u128); |
| fptoui_tests!(f* -> u128); |
| |
| // The following tests cover edge cases for some integer types. |
| |
| // # u8 |
| test!(254., f* -> u8, 254); |
| test!(256., f* -> u8, 255); |
| |
| // # i8 |
| test!(-127., f* -> i8, -127); |
| test!(-129., f* -> i8, -128); |
| test!(126., f* -> i8, 126); |
| test!(128., f* -> i8, 127); |
| |
| // # i32 |
| // -2147483648. is i32::MIN (exactly) |
| test!(-2147483648., f* -> i32, i32::MIN); |
| // 2147483648. is i32::MAX rounded up |
| test!(2147483648., f32 -> i32, 2147483647); |
| // With 24 significand bits, floats with magnitude in [2^30 + 1, 2^31] are rounded to |
| // multiples of 2^7. Therefore, nextDown(round(i32::MAX)) is 2^31 - 128: |
| test!(2147483520., f32 -> i32, 2147483520); |
| // Similarly, nextUp(i32::MIN) is i32::MIN + 2^8 and nextDown(i32::MIN) is i32::MIN - 2^7 |
| test!(-2147483904., f* -> i32, i32::MIN); |
| test!(-2147483520., f* -> i32, -2147483520); |
| |
| // # u32 |
| // round(MAX) and nextUp(round(MAX)) |
| test!(4294967040., f* -> u32, 4294967040); |
| test!(4294967296., f* -> u32, 4294967295); |
| |
| // # u128 |
| // float->int: |
| test!(f32::MAX, f32 -> u128, 0xffffff00000000000000000000000000); |
| // nextDown(f32::MAX) = 2^128 - 2 * 2^104 |
| const SECOND_LARGEST_F32: f32 = 340282326356119256160033759537265639424.; |
| test!(SECOND_LARGEST_F32, f32 -> u128, 0xfffffe00000000000000000000000000); |
| } |
| |
| fn nan_casts() { |
| let nan1 = f64::from_bits(0x7FF0_0001_0000_0001u64); |
| let nan2 = f64::from_bits(0x7FF0_0000_0000_0001u64); |
| |
| assert!(nan1.is_nan()); |
| assert!(nan2.is_nan()); |
| |
| let nan1_32 = nan1 as f32; |
| let nan2_32 = nan2 as f32; |
| |
| assert!(nan1_32.is_nan()); |
| assert!(nan2_32.is_nan()); |
| } |
| |
| fn rounding() { |
| // Test cases taken from the library's tests for this feature |
| // f32 |
| assert_eq(2.5f32.round_ties_even(), 2.0f32); |
| assert_eq(1.0f32.round_ties_even(), 1.0f32); |
| assert_eq(1.3f32.round_ties_even(), 1.0f32); |
| assert_eq(1.5f32.round_ties_even(), 2.0f32); |
| assert_eq(1.7f32.round_ties_even(), 2.0f32); |
| assert_eq(0.0f32.round_ties_even(), 0.0f32); |
| assert_eq((-0.0f32).round_ties_even(), -0.0f32); |
| assert_eq((-1.0f32).round_ties_even(), -1.0f32); |
| assert_eq((-1.3f32).round_ties_even(), -1.0f32); |
| assert_eq((-1.5f32).round_ties_even(), -2.0f32); |
| assert_eq((-1.7f32).round_ties_even(), -2.0f32); |
| // f64 |
| assert_eq(2.5f64.round_ties_even(), 2.0f64); |
| assert_eq(1.0f64.round_ties_even(), 1.0f64); |
| assert_eq(1.3f64.round_ties_even(), 1.0f64); |
| assert_eq(1.5f64.round_ties_even(), 2.0f64); |
| assert_eq(1.7f64.round_ties_even(), 2.0f64); |
| assert_eq(0.0f64.round_ties_even(), 0.0f64); |
| assert_eq((-0.0f64).round_ties_even(), -0.0f64); |
| assert_eq((-1.0f64).round_ties_even(), -1.0f64); |
| assert_eq((-1.3f64).round_ties_even(), -1.0f64); |
| assert_eq((-1.5f64).round_ties_even(), -2.0f64); |
| assert_eq((-1.7f64).round_ties_even(), -2.0f64); |
| } |
