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use crate::simd::SimdBool;
/// Base trait for every SIMD types.
pub trait SimdValue: Sized {
/// The number of lanes of this SIMD value.
const LANES: usize;
/// 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;
/// 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.
///
/// # Safety
/// Undefined behavior if `i >= Self::LANES`.
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.
///
/// # Safety
/// Undefined behavior if `i >= Self::LANES`.
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> {
const LANES: usize = N::LANES;
type Element = num_complex::Complex<N::Element>;
type SimdBool = N::SimdBool;
#[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 {
const LANES: usize = 1;
type Element = $t;
type SimdBool = bool;
#[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);