rust/fpnum/src/lib.rs
author alfadur
Tue, 16 Oct 2018 04:43:02 +0300
changeset 13930 2ee07e751171
parent 13910 fed924791e06
child 13931 2717a5289d88
permissions -rw-r--r--
add more fpnum functions
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use std::cmp;
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use std::ops;
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#[derive(Clone, Debug, Copy)]
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pub struct FPNum {
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    is_negative: bool,
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    value: u64,
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}
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impl FPNum {
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    fn new(numerator: i32, denominator: u32) -> Self {
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        FPNum::from(numerator) / denominator
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    }
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    #[inline]
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    fn signum(&self) -> i8 {
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        if self.is_negative {
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            -1
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        } else {
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            1
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        }
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    }
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    #[inline]
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    fn is_negative(&self) -> bool {
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        self.is_negative
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    }
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    #[inline]
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    fn is_positive(&self) -> bool {
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        !self.is_negative
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    }
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    #[inline]
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    fn is_zero(&self) -> bool {
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        self.value == 0
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    }
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    #[inline]
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    fn abs(&self) -> Self {
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        Self {
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            is_negative: false,
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            value: self.value,
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        }
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    }
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    #[inline]
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    fn round(&self) -> i64 {
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        if self.is_negative {
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            -((self.value >> 32) as i64)
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        } else {
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            (self.value >> 32) as i64
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        }
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    }
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    #[inline]
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    fn sqr(&self) -> Self {
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        Self {
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            is_negative: false,
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            value: ((self.value as u128).pow(2) >> 32) as u64,
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        }
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    }
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    fn sqrt(&self) -> Self {
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        debug_assert!(!self.is_negative);
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        let mut t: u64 = 0x4000000000000000;
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        let mut r: u64 = 0;
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        let mut q = self.value;
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        for _ in 0..32 {
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            let s = r + t;
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            r >>= 1;
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            if s <= q {
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                q -= s;
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                r += t;
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            }
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            t >>= 2;
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        }
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        Self {
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            is_negative: false,
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            value: r << 16,
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        }
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    }
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    fn with_sign(&self, is_negative: bool) -> FPNum {
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        FPNum{ is_negative, ..*self}
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    }
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    #[inline]
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    fn with_sign_as(self, other: FPNum) -> FPNum {
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        self.with_sign(other.is_negative)
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    }
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}
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impl From<i32> for FPNum {
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    #[inline]
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    fn from(n: i32) -> Self {
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        FPNum {
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            is_negative: n < 0,
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            value: (n.abs() as u64) << 32,
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        }
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    }
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}
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impl From<u32> for FPNum {
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    #[inline]
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    fn from(n: u32) -> Self {
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        Self {
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            is_negative: false,
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            value: (n as u64) << 32,
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        }
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    }
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}
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impl From<FPNum> for f64 {
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    #[inline]
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    fn from(n: FPNum) -> Self {
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        if n.is_negative {
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            n.value as f64 / (-0x10000000 as f64)
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        } else {
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            n.value as f64 / 0x10000000 as f64
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        }
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    }
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}
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impl PartialEq for FPNum {
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    #[inline]
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    fn eq(&self, other: &Self) -> bool {
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        self.value == other.value && (self.is_negative == other.is_negative || self.value == 0)
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    }
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}
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impl Eq for FPNum {}
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impl PartialOrd for FPNum {
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    #[inline]
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    fn partial_cmp(&self, rhs: &Self) -> std::option::Option<std::cmp::Ordering> {
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        Some(self.cmp(rhs))
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    }
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}
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impl Ord for FPNum {
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    #[inline]
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    fn cmp(&self, rhs: &Self) -> cmp::Ordering {
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        #[inline]
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        fn extend(n: &FPNum) -> i128 {
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            if n.is_negative {
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                -(n.value as i128)
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            } else {
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                n.value as i128
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            }
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        }
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        extend(self).cmp(&(extend(rhs)))
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    }
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}
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impl ops::Add for FPNum {
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    type Output = Self;
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    #[inline]
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    fn add(self, rhs: Self) -> Self {
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        if self.is_negative == rhs.is_negative {
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            Self {
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                is_negative: self.is_negative,
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                value: self.value + rhs.value,
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            }
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        } else if self.value > rhs.value {
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            Self {
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                is_negative: self.is_negative,
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                value: self.value - rhs.value,
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            }
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        } else {
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            Self {
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                is_negative: rhs.is_negative,
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                value: rhs.value - self.value,
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            }
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        }
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    }
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}
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impl ops::Sub for FPNum {
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    type Output = Self;
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    #[inline]
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    fn sub(self, rhs: Self) -> Self {
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        if self.is_negative == rhs.is_negative {
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            if self.value > rhs.value {
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                Self {
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                    is_negative: self.is_negative,
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                    value: self.value - rhs.value,
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                }
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            } else {
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                Self {
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                    is_negative: !rhs.is_negative,
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                    value: rhs.value - self.value,
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                }
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            }
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        } else {
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            Self {
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                is_negative: self.is_negative,
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                value: self.value + rhs.value,
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            }
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        }
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    }
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}
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impl ops::Neg for FPNum {
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    type Output = Self;
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    #[inline]
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    fn neg(self) -> Self {
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        Self {
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            is_negative: !self.is_negative,
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            value: self.value,
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        }
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    }
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}
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impl ops::Mul for FPNum {
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    type Output = Self;
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    #[inline]
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    fn mul(self, rhs: Self) -> Self {
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        Self {
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            is_negative: self.is_negative ^ rhs.is_negative,
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            value: ((self.value as u128 * rhs.value as u128) >> 32) as u64,
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        }
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    }
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}
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impl ops::Mul<i32> for FPNum {
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    type Output = Self;
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    #[inline]
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    fn mul(self, rhs: i32) -> Self {
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        Self {
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            is_negative: self.is_negative ^ (rhs < 0),
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            value: self.value * rhs.abs() as u64,
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        }
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    }
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}
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impl ops::Div for FPNum {
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    type Output = Self;
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    #[inline]
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    fn div(self, rhs: Self) -> Self {
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        Self {
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            is_negative: self.is_negative ^ rhs.is_negative,
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            value: (((self.value as u128) << 32) / rhs.value as u128) as u64,
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        }
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    }
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}
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impl ops::Div<i32> for FPNum {
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    type Output = Self;
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    #[inline]
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    fn div(self, rhs: i32) -> Self {
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        Self {
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            is_negative: self.is_negative ^ (rhs < 0),
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            value: self.value / rhs.abs() as u64,
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        }
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    }
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}
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impl ops::Div<u32> for FPNum {
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    type Output = Self;
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    #[inline]
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    fn div(self, rhs: u32) -> Self {
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        Self {
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            is_negative: self.is_negative,
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            value: self.value / rhs as u64,
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        }
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    }
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}
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macro_rules! fp {
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    (-$n: tt / $d: tt) => { FPNum::new(-$n, $d) };
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    ($n: tt / $d: tt) => { FPNum::new($n, $d) };
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    (-$n: tt) => { FPNum::from(-$n) };
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    ($n: tt) => { FPNum::from($n) };
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}
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const LINEARIZE_TRESHOLD: u64 = 0x1_0000;
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#[derive(Clone, Copy, Debug)]
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struct FPPoint {
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    x_is_negative: bool,
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    y_is_negative: bool,
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    x_value: u64,
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    y_value: u64,
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}
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impl FPPoint {
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    #[inline]
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    fn new(x: FPNum, y: FPNum) -> Self {
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        Self {
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            x_is_negative: x.is_negative,
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            y_is_negative: y.is_negative,
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            x_value: x.value,
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            y_value: y.value
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        }
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    }
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    #[inline]
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    fn zero() -> FPPoint { FPPoint::new(fp!(0), fp!(0)) }
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    #[inline]
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    fn unit_x() -> FPPoint { FPPoint::new(fp!(1), fp!(0)) }
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    #[inline]
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    fn unit_y() -> FPPoint { FPPoint::new(fp!(0), fp!(1)) }
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    #[inline]
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    fn x(&self) -> FPNum {
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        FPNum {
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            is_negative: self.x_is_negative,
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            value: self.x_value
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        }
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    }
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    #[inline]
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    fn y(&self) -> FPNum {
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        FPNum {
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            is_negative: self.y_is_negative,
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            value: self.y_value
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        }
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    }
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    #[inline]
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    fn sqr_distance(&self) -> FPNum {
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        self.x().sqr() + self.y().sqr()
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    }
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    #[inline]
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    fn distance(&self) -> FPNum {
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        let r = self.x_value | self.y_value;
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        if r < LINEARIZE_TRESHOLD {
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            FPNum::from(r as u32)
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        } else {
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            self.sqr_distance().sqrt()
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        }
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    }
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    #[inline]
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    fn is_in_range(&self, radius: FPNum) -> bool {
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        std::cmp::max(self.x(), self.y()) < radius
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   353
            && self.sqr_distance() < radius.sqr()
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   354
    }
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   355
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   356
    #[inline]
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   357
    fn dot(&self, other: &FPPoint) -> FPNum {
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   358
        self.x() * other.x() + self.y() * other.y()
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   359
    }
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   360
}
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   361
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   362
impl PartialEq for FPPoint {
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   363
    #[inline]
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   364
    fn eq(&self, other: &Self) -> bool {
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parents: 13910
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   365
        self.x() == other.x() && self.y() == other.y()
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   366
    }
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   367
}
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diff changeset
   368
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   369
impl Eq for FPPoint {}
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   370
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   371
impl ops::Neg for FPPoint {
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   372
    type Output = Self;
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   373
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   374
    #[inline]
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   375
    fn neg(self) -> Self {
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   376
        Self::new(-self.x(), -self.y())
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   377
    }
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diff changeset
   378
}
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diff changeset
   379
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   380
macro_rules! bin_op_impl {
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   381
    ($op: path, $name: tt) => {
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diff changeset
   382
        impl $op for FPPoint {
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   383
            type Output = Self;
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alfadur
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diff changeset
   384
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diff changeset
   385
            #[inline]
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diff changeset
   386
            fn $name(self, rhs: Self) -> Self {
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diff changeset
   387
                Self::new(self.x().$name(rhs.x()),
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diff changeset
   388
                          self.y().$name(rhs.y()))
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diff changeset
   389
            }
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diff changeset
   390
        }
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diff changeset
   391
    }
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diff changeset
   392
}
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diff changeset
   393
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   394
bin_op_impl!(ops::Add, add);
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   395
bin_op_impl!(ops::Sub, sub);
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diff changeset
   396
bin_op_impl!(ops::Mul, mul);
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diff changeset
   397
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alfadur
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diff changeset
   398
#[inline]
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alfadur
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diff changeset
   399
fn distance<T>(x: T, y: T) -> FPNum
2ee07e751171 add more fpnum functions
alfadur
parents: 13910
diff changeset
   400
    where T: ops::Add + ops::Mul + Copy +
2ee07e751171 add more fpnum functions
alfadur
parents: 13910
diff changeset
   401
             From<<T as ops::Add>::Output> +
2ee07e751171 add more fpnum functions
alfadur
parents: 13910
diff changeset
   402
             From<<T as ops::Mul>::Output> +
2ee07e751171 add more fpnum functions
alfadur
parents: 13910
diff changeset
   403
             Into<FPNum>
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alfadur
parents: 13910
diff changeset
   404
{
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alfadur
parents: 13910
diff changeset
   405
    let sqr: FPNum = T::from(T::from(x * x) + T::from(y * y)).into();
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alfadur
parents: 13910
diff changeset
   406
    sqr.sqrt()
2ee07e751171 add more fpnum functions
alfadur
parents: 13910
diff changeset
   407
}
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alfadur
parents: 13910
diff changeset
   408
13887
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   409
/* TODO:
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   410
 AngleSin
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   411
 AngleCos
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   412
*/
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   413
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   414
#[cfg(test)]
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   415
#[test]
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   416
fn basics() {
13896
9ae1184886db add fpnum literal macro
alfadur
parents: 13890
diff changeset
   417
    let n = fp!(15/2);
13887
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   418
    assert!(n.is_positive());
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   419
    assert!(!n.is_negative());
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   420
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   421
    assert!(!(-n).is_positive());
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   422
    assert!((-n).is_negative());
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   423
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   424
    assert_eq!(-(-n), n);
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   425
    assert_eq!((-n).abs(), n);
13896
9ae1184886db add fpnum literal macro
alfadur
parents: 13890
diff changeset
   426
    assert_eq!(-n, fp!(-15/2));
13887
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   427
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   428
    assert_eq!(n.round(), 7);
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   429
    assert_eq!((-n).round(), -7);
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   430
}
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   431
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   432
#[test]
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   433
fn zero() {
13896
9ae1184886db add fpnum literal macro
alfadur
parents: 13890
diff changeset
   434
    let z = fp!(0);
9ae1184886db add fpnum literal macro
alfadur
parents: 13890
diff changeset
   435
    let n = fp!(15/2);
13887
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   436
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   437
    assert!(z.is_zero());
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   438
    assert!(z.is_positive());
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   439
    assert!((-z).is_negative);
13888
2bfd7472ef1d Add some more tests
unc0rr
parents: 13887
diff changeset
   440
    assert_eq!(n - n, z);
2bfd7472ef1d Add some more tests
unc0rr
parents: 13887
diff changeset
   441
    assert_eq!(-n + n, z);
13930
2ee07e751171 add more fpnum functions
alfadur
parents: 13910
diff changeset
   442
    assert_eq!(z.with_sign_as(-n), -z);
13887
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   443
}
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   444
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   445
#[test]
13889
fbbb4fcd6a75 delegate cmp to rustlib
alfadur
parents: 13888
diff changeset
   446
fn ord() {
13896
9ae1184886db add fpnum literal macro
alfadur
parents: 13890
diff changeset
   447
    let z = fp!(0);
9ae1184886db add fpnum literal macro
alfadur
parents: 13890
diff changeset
   448
    let n1_5 = fp!(3/2);
9ae1184886db add fpnum literal macro
alfadur
parents: 13890
diff changeset
   449
    let n2_25 = fp!(9/4);
13889
fbbb4fcd6a75 delegate cmp to rustlib
alfadur
parents: 13888
diff changeset
   450
fbbb4fcd6a75 delegate cmp to rustlib
alfadur
parents: 13888
diff changeset
   451
    assert!(!(z > z));
fbbb4fcd6a75 delegate cmp to rustlib
alfadur
parents: 13888
diff changeset
   452
    assert!(!(z < z));
fbbb4fcd6a75 delegate cmp to rustlib
alfadur
parents: 13888
diff changeset
   453
    assert!(n2_25 > n1_5);
fbbb4fcd6a75 delegate cmp to rustlib
alfadur
parents: 13888
diff changeset
   454
    assert!(-n2_25 < n1_5);
fbbb4fcd6a75 delegate cmp to rustlib
alfadur
parents: 13888
diff changeset
   455
    assert!(-n2_25 < -n1_5);
fbbb4fcd6a75 delegate cmp to rustlib
alfadur
parents: 13888
diff changeset
   456
}
fbbb4fcd6a75 delegate cmp to rustlib
alfadur
parents: 13888
diff changeset
   457
fbbb4fcd6a75 delegate cmp to rustlib
alfadur
parents: 13888
diff changeset
   458
#[test]
13887
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   459
fn arith() {
13896
9ae1184886db add fpnum literal macro
alfadur
parents: 13890
diff changeset
   460
    let n1_5 = fp!(3/2);
9ae1184886db add fpnum literal macro
alfadur
parents: 13890
diff changeset
   461
    let n2_25 = fp!(9/4);
9ae1184886db add fpnum literal macro
alfadur
parents: 13890
diff changeset
   462
    let n_0_15 = fp!(-15/100);
13887
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   463
13896
9ae1184886db add fpnum literal macro
alfadur
parents: 13890
diff changeset
   464
    assert_eq!(n1_5 + n1_5, fp!(3));
9ae1184886db add fpnum literal macro
alfadur
parents: 13890
diff changeset
   465
    assert_eq!(-n1_5 - n1_5, fp!(-3));
13887
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   466
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   467
    assert_eq!(n1_5 * n1_5, n2_25);
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   468
    assert_eq!(-n1_5 * -n1_5, n2_25);
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   469
    assert_eq!(n1_5 * -n1_5, -n2_25);
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   470
    assert_eq!(-n1_5 * n1_5, -n2_25);
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   471
13888
2bfd7472ef1d Add some more tests
unc0rr
parents: 13887
diff changeset
   472
    assert_eq!(-n2_25 / -n1_5, n1_5);
2bfd7472ef1d Add some more tests
unc0rr
parents: 13887
diff changeset
   473
    assert_eq!(n1_5 / -10, n_0_15);
2bfd7472ef1d Add some more tests
unc0rr
parents: 13887
diff changeset
   474
13887
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   475
    assert_eq!(n1_5.sqr(), n2_25);
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   476
    assert_eq!((-n1_5).sqr(), n2_25);
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   477
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   478
    assert_eq!(n2_25.sqrt(), n1_5);
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   479
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   480
    assert_eq!((n1_5 * n1_5 * n1_5.sqr()).sqrt(), n2_25);
b172a5d40eee Reimplement hwFloat library in rust for future use
unc0rr
parents:
diff changeset
   481
}
13930
2ee07e751171 add more fpnum functions
alfadur
parents: 13910
diff changeset
   482
2ee07e751171 add more fpnum functions
alfadur
parents: 13910
diff changeset
   483
#[test]
2ee07e751171 add more fpnum functions
alfadur
parents: 13910
diff changeset
   484
fn point() {
2ee07e751171 add more fpnum functions
alfadur
parents: 13910
diff changeset
   485
    let z = FPPoint::zero();
2ee07e751171 add more fpnum functions
alfadur
parents: 13910
diff changeset
   486
    let p = FPPoint::new(fp!(1), fp!(-2));
2ee07e751171 add more fpnum functions
alfadur
parents: 13910
diff changeset
   487
2ee07e751171 add more fpnum functions
alfadur
parents: 13910
diff changeset
   488
    assert_eq!(p.sqr_distance(), fp!(5));
2ee07e751171 add more fpnum functions
alfadur
parents: 13910
diff changeset
   489
    assert_eq!(p + -p, FPPoint::zero());
2ee07e751171 add more fpnum functions
alfadur
parents: 13910
diff changeset
   490
    assert_eq!(p * z, z);
2ee07e751171 add more fpnum functions
alfadur
parents: 13910
diff changeset
   491
    assert_eq!(p.dot(&z), fp!(0));
2ee07e751171 add more fpnum functions
alfadur
parents: 13910
diff changeset
   492
    assert_eq!(distance(4, 3), fp!(5));
2ee07e751171 add more fpnum functions
alfadur
parents: 13910
diff changeset
   493
}