simd_value.rs - source
Description: Source of the Rust file `/Users/erlendbasso/.cargo/registry/src/github.com-1ecc6299db9ec823/simba-0.8.0/src/simd/simd_value.rs`.
Keywords: rust, rustlang, rust-lang

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    use crate::simd::SimdBool;

    /// Base trait for every SIMD types.
    pub trait SimdValue: Sized {
        /// The type of the elements of each lane of this SIMD value.
        type Element: SimdValue<Element = Self::Element, SimdBool = bool>;
        /// Type of the result of comparing two SIMD values like `self`.
        type SimdBool: SimdBool;

        /// The number of lanes of this SIMD value.
        fn lanes() -> usize;
        /// Initializes an SIMD value with each lanes set to `val`.
        fn splat(val: Self::Element) -> Self;
        /// Extracts the i-th lane of `self`.
        ///
        /// Panics if `i >= Self::lanes()`.
        fn extract(&self, i: usize) -> Self::Element;
        /// Extracts the i-th lane of `self` without bound-checking.
        unsafe fn extract_unchecked(&self, i: usize) -> Self::Element;
        /// Replaces the i-th lane of `self` by `val`.
        ///
        /// Panics if `i >= Self::lanes()`.
        fn replace(&mut self, i: usize, val: Self::Element);
        /// Replaces the i-th lane of `self` by `val` without bound-checking.
        unsafe fn replace_unchecked(&mut self, i: usize, val: Self::Element);

        /// Merges `self` and `other` depending on the lanes of `cond`.
        ///
        /// For each lane of `cond` with bits set to 1, the result's will contain the value of the lane of `self`.
        /// For each lane of `cond` with bits set to 0, the result's will contain the value of the lane of `other`.
        fn select(self, cond: Self::SimdBool, other: Self) -> Self;

        /// Applies a function to each lane of `self`.
        ///
        /// Note that, while convenient, this method can be extremely slow as this
        /// requires to extract each lane of `self` and then combine them again into
        /// a new SIMD value.
        #[inline(always)]
        fn map_lanes(self, f: impl Fn(Self::Element) -> Self::Element) -> Self
        where
            Self: Clone,
        {
            let mut result = self.clone();

            for i in 0..Self::lanes() {
                unsafe { result.replace_unchecked(i, f(self.extract_unchecked(i))) }
            }

            result
        }

        /// Applies a function to each lane of `self` paired with the corresponding lane of `b`.
        ///
        /// Note that, while convenient, this method can be extremely slow as this
        /// requires to extract each lane of `self` and then combine them again into
        /// a new SIMD value.
        #[inline(always)]
        fn zip_map_lanes(
            self,
            b: Self,
            f: impl Fn(Self::Element, Self::Element) -> Self::Element,
        ) -> Self
        where
            Self: Clone,
        {
            let mut result = self.clone();

            for i in 0..Self::lanes() {
                unsafe {
                    let a = self.extract_unchecked(i);
                    let b = b.extract_unchecked(i);
                    result.replace_unchecked(i, f(a, b))
                }
            }

            result
        }
    }

    /// Marker trait implemented by SIMD and non-SIMD primitive numeric values.
    ///
    /// This trait is useful for some disambiguations when writing blanked impls.
    /// This is implemented by all unsigned integer, integer, float, and complex types, as
    /// with only one lane, i.e., `f32`, `f64`, `u32`, `i64`, etc. as well as SIMD types like
    /// `f32x4, i32x8`, etc..
    pub trait PrimitiveSimdValue: Copy + SimdValue {}

    impl<N: SimdValue> SimdValue for num_complex::Complex<N> {
        type Element = num_complex::Complex<N::Element>;
        type SimdBool = N::SimdBool;

        #[inline(always)]
        fn lanes() -> usize {
            N::lanes()
        }

        #[inline(always)]
        fn splat(val: Self::Element) -> Self {
            num_complex::Complex {
                re: N::splat(val.re),
                im: N::splat(val.im),
            }
        }

        #[inline(always)]
        fn extract(&self, i: usize) -> Self::Element {
            num_complex::Complex {
                re: self.re.extract(i),
                im: self.im.extract(i),
            }
        }

        #[inline(always)]
        unsafe fn extract_unchecked(&self, i: usize) -> Self::Element {
            num_complex::Complex {
                re: self.re.extract_unchecked(i),
                im: self.im.extract_unchecked(i),
            }
        }

        #[inline(always)]
        fn replace(&mut self, i: usize, val: Self::Element) {
            self.re.replace(i, val.re);
            self.im.replace(i, val.im);
        }

        #[inline(always)]
        unsafe fn replace_unchecked(&mut self, i: usize, val: Self::Element) {
            self.re.replace_unchecked(i, val.re);
            self.im.replace_unchecked(i, val.im);
        }

        #[inline(always)]
        fn select(self, cond: Self::SimdBool, other: Self) -> Self {
            num_complex::Complex {
                re: self.re.select(cond, other.re),
                im: self.im.select(cond, other.im),
            }
        }
    }

    impl<N: PrimitiveSimdValue> PrimitiveSimdValue for num_complex::Complex<N> {}

    macro_rules! impl_primitive_simd_value_for_scalar(
        ($($t: ty),*) => {$(
            impl PrimitiveSimdValue for $t {}
            impl SimdValue for $t {
                type Element = $t;
                type SimdBool = bool;

                #[inline(always)]
                fn lanes() -> usize {
                    1
                }

                #[inline(always)]
                fn splat(val: Self::Element) -> Self {
                    val
                }

                #[inline(always)]
                fn extract(&self, _: usize) -> Self::Element {
                    *self
                }

                #[inline(always)]
                unsafe fn extract_unchecked(&self, _: usize) -> Self::Element {
                    *self
                }

                #[inline(always)]
                fn replace(&mut self, _: usize, val: Self::Element) {
                    *self = val
                }

                #[inline(always)]
                unsafe fn replace_unchecked(&mut self, _: usize, val: Self::Element) {
                    *self = val
                }

                #[inline(always)]
                fn select(self, cond: Self::SimdBool, other: Self) -> Self {
                    if cond {
                        self
                    } else {
                        other
                    }
                }
            }
        )*}
    );

    impl_primitive_simd_value_for_scalar!(
        bool, u8, u16, u32, u64, u128, usize, i8, i16, i32, i64, i128, isize, f32, f64
    );
    #[cfg(feature = "decimal")]
    impl_primitive_simd_value_for_scalar!(decimal::d128);