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use crate::indicators::donchianchannel::State;
#[cfg(feature = "simd_assets")]
pub use crate::indicators::simd_indicators::by_asset::donchianchannel::indicator_by_assets;
#[cfg(feature = "simd_options")]
pub use crate::indicators::simd_indicators::by_option::donchianchannel::indicator_by_options;
use crate::indicators::simd_indicators::{
max_simd::SimdState as SimdMaxState, medprice_simd::calc_simd as calc_medprice_simd,
min_simd::SimdState as SimdMinState,
};
use std::simd::Simd;
/// SIMD-parallel state for computing the Donchian Channel indicator across `N` assets or option-sets simultaneously.
/// Wraps dedicated min/max ring-buffer SIMD states, one per lane.
pub struct SimdState<const N: usize> {
min_state: SimdMinState<N>,
max_state: SimdMaxState<N>,
}
impl<const N: usize> SimdState<N> {
/// Gathers `N` scalar [`State`] references into a single `SimdState`,
/// packing each field into a SIMD lane.
pub fn new(states: &mut [&mut State]) -> Self {
let mut min_state = Vec::with_capacity(N);
let mut max_state = Vec::with_capacity(N);
for state in states.iter_mut() {
min_state.push(&mut state.min_state);
max_state.push(&mut state.max_state);
}
let min_state = SimdMinState::new(&min_state);
let max_state = SimdMaxState::new(&max_state);
Self {
min_state,
max_state,
}
}
/// Writes the SIMD state back into `N` existing mutable scalar [`State`] references in place,
/// avoiding allocation compared to a `to_states` conversion.
pub fn write_states(&self, states: &mut [&mut State]) {
let mut max_refs = Vec::with_capacity(N);
let mut min_refs = Vec::with_capacity(N);
for state in states.iter_mut() {
max_refs.push(&mut state.max_state);
min_refs.push(&mut state.min_state);
}
self.max_state.write_states(&mut max_refs);
self.min_state.write_states(&mut min_refs);
}
}
pub mod assets {
use super::*;
use crate::indicators::simd_indicators::{
max_simd::assets::Calc as CalcMax, min_simd::assets::Calc as CalcMin,
};
pub trait Calc<const N: usize> {
unsafe fn calc_unchecked_simd<const WINDOW_LANES: usize>(
&mut self,
high: [*const f64; N],
low: [*const f64; N],
i: usize,
look_back: usize,
) -> (Simd<f64, N>, Simd<f64, N>, Simd<f64, N>);
}
impl<const N: usize> Calc<N> for SimdState<N> {
/// Advances the Donchian Channel by one bar across `N` asset lanes simultaneously.
///
/// Updates the rolling min/max windows, then computes the lower, middle, and upper
/// channel values for all lanes in parallel.
///
/// # Safety
///
/// `high_ptrs[k]` and `low_ptrs[k]` must point to arrays of at least `i + 1` elements.
///
/// # Arguments
///
/// * `high_ptrs` / `low_ptrs` - Per-asset pointers into the high/low price arrays.
/// * `i` - Current bar index (shared across all asset lanes).
/// * `look_back` - Min/max sliding-window size (`= period - 1`), shared across lanes.
///
/// # Returns
///
/// `(lower, middle, upper)` as SIMD vectors, one value per asset lane.
#[inline(always)]
unsafe fn calc_unchecked_simd<const WINDOW_LANES: usize>(
&mut self,
high_ptrs: [*const f64; N],
low_ptrs: [*const f64; N],
i: usize,
look_back: usize,
) -> (Simd<f64, N>, Simd<f64, N>, Simd<f64, N>) {
let (min, _) = self
.min_state
.calc_unchecked_simd::<WINDOW_LANES>(low_ptrs, i, look_back);
let (max, _) = self
.max_state
.calc_unchecked_simd::<WINDOW_LANES>(high_ptrs, i, look_back);
let middle = calc_medprice_simd(max, min);
(min, middle, max)
}
}
}
pub mod options {
use super::*;
use crate::indicators::simd_indicators::{
max_simd::options::Calc as CalcMax, min_simd::options::Calc as CalcMin,
};
pub trait Calc<const N: usize> {
unsafe fn calc_unchecked_simd(
&mut self,
high: [*const f64; N],
low: [*const f64; N],
i: Simd<usize, N>,
look_back: Simd<usize, N>,
) -> (Simd<f64, N>, Simd<f64, N>, Simd<f64, N>);
}
impl<const N: usize> Calc<N> for SimdState<N> {
/// Advances the Donchian Channel by one output bar across `N` option-set lanes simultaneously.
///
/// Each lane may have a different period (encoded in `look_back`), so bar indices and
/// window sizes are SIMD vectors rather than scalars.
///
/// # Safety
///
/// For each lane `k`, `high_ptrs[k]` and `low_ptrs[k]` must point to arrays of at
/// least `i[k] + 1` elements.
///
/// # Arguments
///
/// * `high_ptrs` / `low_ptrs` - Per-lane pointers into the high/low price arrays.
/// * `i` - Current bar indices, one per lane.
/// * `look_back` - Per-lane min/max window sizes (`= period - 1` for each lane).
///
/// # Returns
///
/// `(lower, middle, upper)` as SIMD vectors, one value per option lane.
#[inline(always)]
unsafe fn calc_unchecked_simd(
&mut self,
high_ptrs: [*const f64; N],
low_ptrs: [*const f64; N],
i: Simd<usize, N>,
look_back: Simd<usize, N>,
) -> (Simd<f64, N>, Simd<f64, N>, Simd<f64, N>) {
let (min, _) = self.min_state.calc_unchecked_simd(low_ptrs, i, look_back);
let (max, _) = self.max_state.calc_unchecked_simd(high_ptrs, i, look_back);
let middle = calc_medprice_simd(max, min);
(min, middle, max)
}
}
}