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//use crate::common::validate_inputs;
use crate::indicators::mfi::{
min_data, output_length, IndicatorState as State, INPUTS_WIDTH, OPTIONS_WIDTH,
};
use crate::indicators::simd_indicators::mfi_simd::assets::SimdState;
use crate::indicators::simd_indicators::road_train::{Asset, Driver, PrimeMover};
use crate::types::IndicatorError;
use crate::{common::validate_options, common_simd::assets::validate_inputs};
use std::simd::Simd;
/// SIMD driver that advances the Money Flow Index (MFI) across `N` asset lanes per
/// scheduling epoch.
struct MfiDriver {
want_optional_outputs: bool,
}
impl Driver<State> for MfiDriver {
/// Processes one epoch of bars for `N` assets simultaneously using SIMD.
///
/// Reads from `inputs[asset][field]` (high, low, close, volume), writes the MFI to
/// `outputs[asset][0]`, optional typical price to `outputs[asset][1]`, and updates
/// `states[asset]` in place.
fn next_run<const N: usize>(
&mut self,
inputs: Vec<Vec<&[f64]>>,
mut outputs: Vec<Vec<&mut [f64]>>,
mut states: Vec<&mut State>,
_options: Vec<Option<&()>>,
) {
let mut state = SimdState::<N>::new(&mut states);
let len = inputs[0][0].len();
let want_typprice = self.want_optional_outputs;
//collect outputs
let (mfi_line_ptr, typprice_line_ptr) =
crate::extract_output_ptrs!(outputs, N, mfi_line_ptr, typprice_line_ptr);
let (high_ptrs, low_ptrs, close_ptrs, volume_ptrs) =
crate::extract_input_ptrs!(inputs, N, high_ptrs, low_ptrs, close_ptrs, volume_ptrs);
// Optimization 3: Simplified main loop with pre-computed offsets
for i in 0..len {
// Get inputs arrays for stocks
let (high, low, close, volume) = crate::extract_simd_inputs_at_index!(
i,
N,
high @ high_ptrs,
low @ low_ptrs,
close @ close_ptrs,
volume @ volume_ptrs
);
let mfi = unsafe { state.calc_unchecked_simd(high, low, close, volume) };
//unsafe { calc_simd(&mut state, high, low, close, multiplier) };
// Store results using pre-computed pointers
crate::write_simd_at_indices!(N, i,
mfi_line_ptr => mfi
);
crate::store_simd_optional_outputs!(i, N,
want_typprice, typprice_line_ptr => state.typprice
);
}
// Update states efficiently
state.write_states(&mut states);
}
}
/// Calculates the Money Flow Index (MFI) for `N` assets simultaneously using SIMD
/// parallelism.
///
/// Uses the [`PrimeMover`] scheduler to batch assets into SIMD-width groups.
///
/// # Arguments
/// * `inputs` - An array of `N` asset input sets; `inputs[i]` is `[&[f64]; INPUTS_WIDTH]`
/// containing `[high, low, close, volume]` for asset `i`.
/// * `options` - Shared options slice; `options[0]` is the period.
/// * `optional_outputs` - Optional slice selecting extra outputs: index `0` = `typprice`.
///
/// # Returns
/// `Ok((outputs, states))` where `outputs[i][0]` is the MFI for asset `i`,
/// `outputs[i][1]` is the optional typical price, and `states[i]` is the final
/// [`IndicatorState`] for asset `i`.
/// Returns `Err(IndicatorError)` if any input slice is too short or options are invalid.
pub fn indicator_by_assets<const N: usize>(
inputs: &[&[&[f64]; INPUTS_WIDTH]; N], //stock[ fields [ field [f64] ] ]
options: &[f64; OPTIONS_WIDTH],
optional_outputs: Option<&[bool]>,
) -> Result<(Vec<Vec<Vec<f64>>>, Vec<State>), IndicatorError> {
validate_inputs::<INPUTS_WIDTH>(inputs, min_data(options))?;
validate_options(options)?;
let period = options[0] as usize;
let mut road_train = PrimeMover::<N, State>::new();
let mut output_buffers = Vec::with_capacity(N);
let mut want_optional_outputs = false;
for i in 0..N {
let asset_inputs = vec![
inputs[i][0], // high
inputs[i][1], // low
inputs[i][2], // close
inputs[i][3], // volume
];
let (mfi_line, mut typprice_line) = {
let len = inputs[i][0].len();
let capacity = output_length(len, options);
(
crate::uninit_vec!(f64, capacity),
crate::init_optional_outputs_eff!(
optional_outputs, &[false],
typprice_line: len
),
)
};
let state = State::init_state(
(inputs[i][0], inputs[i][1], inputs[i][2], inputs[i][3]),
period,
&mut typprice_line,
);
if i == 0 {
(_, want_optional_outputs) = crate::calc_want_flags!(typprice_line);
}
let mut starts = [0; 2];
starts[1] = crate::slice_outputs_start!(mfi_line.len(), typprice_line);
let mut output_buffer = vec![mfi_line, typprice_line];
//let adosc_len = output_buffer[0].len();
let mut asset_outputs = Vec::with_capacity(output_buffer.len());
for j in 0..output_buffer.len() {
unsafe {
//let slice_len = output_buffer.len() - starts[j];
// Get a mutable reference to the output buffer for this asset
let output_buffer = &mut output_buffer[j];
asset_outputs.push(std::slice::from_raw_parts_mut(
output_buffer.as_mut_ptr().add(starts[j]), //slice from
output_buffer.len() - starts[j], // slice to
));
}
}
road_train.add_asset(Asset::new(
asset_inputs,
asset_outputs,
i,
period,
0,
state,
None,
));
output_buffers.push(output_buffer);
}
let mut driver = MfiDriver {
want_optional_outputs,
};
let states = road_train.drive(&mut driver);
Ok((output_buffers, states))
}