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use super::super::sorts::lsd_sort::lsd_radixsort_heu;
use super::super::sorts::utils::{get_empty_histograms, Params};
use super::super::Radixable;
impl Radixable<char> for char {
type Key = char;
#[inline]
fn key(&self) -> char {
*self
}
#[inline]
fn extract(&self, mask: u32, shift: usize) -> usize {
((*self as u32 & mask) >> shift) as usize
}
#[inline]
fn to_generic(&self, v: usize) -> char {
std::char::from_u32(v as u32).unwrap()
}
#[inline]
fn into_key_type(&self) -> u32 {
*self as u32
}
fn get_full_histograms(
&self,
arr: &mut [char],
p: &Params,
) -> Vec<Vec<usize>> {
let mut histograms = get_empty_histograms(p, p.max_level);
let default_mask = self.default_mask(p.radix);
let shift = p.radix as u32;
let quotient = arr.len() / 4;
let remainder = arr.len() % 4;
let offset = quotient * 4;
if p.max_level == 1 {
for q in 0..quotient {
unsafe {
let i = q * 4;
let v0 = *arr.get_unchecked(i) as u32;
let v1 = *arr.get_unchecked(i + 1) as u32;
let v2 = *arr.get_unchecked(i + 2) as u32;
let v3 = *arr.get_unchecked(i + 3) as u32;
histograms[0][(v0 & default_mask) as usize] += 1;
histograms[0][(v1 & default_mask) as usize] += 1;
histograms[0][(v2 & default_mask) as usize] += 1;
histograms[0][(v3 & default_mask) as usize] += 1;
}
}
for i in 0..remainder {
unsafe {
let v = *arr.get_unchecked(offset + i) as u32;
histograms[0][(v & default_mask) as usize] += 1;
}
}
} else if p.max_level == 2 {
for q in 0..quotient {
unsafe {
let i = q * 4;
let mut v0 = *arr.get_unchecked(i) as u32;
let mut v1 = *arr.get_unchecked(i + 1) as u32;
let mut v2 = *arr.get_unchecked(i + 2) as u32;
let mut v3 = *arr.get_unchecked(i + 3) as u32;
histograms[1][(v0 & default_mask) as usize] += 1;
histograms[1][(v1 & default_mask) as usize] += 1;
histograms[1][(v2 & default_mask) as usize] += 1;
histograms[1][(v3 & default_mask) as usize] += 1;
v0 >>= shift;
v1 >>= shift;
v2 >>= shift;
v3 >>= shift;
histograms[0][(v0 & default_mask) as usize] += 1;
histograms[0][(v1 & default_mask) as usize] += 1;
histograms[0][(v2 & default_mask) as usize] += 1;
histograms[0][(v3 & default_mask) as usize] += 1;
}
}
for i in 0..remainder {
unsafe {
let mut v = *arr.get_unchecked(offset + i) as u32;
histograms[1][(v & default_mask) as usize] += 1;
v >>= shift;
histograms[0][(v & default_mask) as usize] += 1;
}
}
} else if p.max_level == 3 {
for q in 0..quotient {
unsafe {
let i = q * 4;
let mut v0 = *arr.get_unchecked(i) as u32;
let mut v1 = *arr.get_unchecked(i + 1) as u32;
let mut v2 = *arr.get_unchecked(i + 2) as u32;
let mut v3 = *arr.get_unchecked(i + 3) as u32;
histograms[2][(v0 & default_mask) as usize] += 1;
histograms[2][(v1 & default_mask) as usize] += 1;
histograms[2][(v2 & default_mask) as usize] += 1;
histograms[2][(v3 & default_mask) as usize] += 1;
v0 >>= shift;
v1 >>= shift;
v2 >>= shift;
v3 >>= shift;
histograms[1][(v0 & default_mask) as usize] += 1;
histograms[1][(v1 & default_mask) as usize] += 1;
histograms[1][(v2 & default_mask) as usize] += 1;
histograms[1][(v3 & default_mask) as usize] += 1;
v0 >>= shift;
v1 >>= shift;
v2 >>= shift;
v3 >>= shift;
histograms[0][(v0 & default_mask) as usize] += 1;
histograms[0][(v1 & default_mask) as usize] += 1;
histograms[0][(v2 & default_mask) as usize] += 1;
histograms[0][(v3 & default_mask) as usize] += 1;
}
}
for i in 0..remainder {
unsafe {
let mut v = *arr.get_unchecked(offset + i) as u32;
histograms[2][(v & default_mask) as usize] += 1;
v >>= shift;
histograms[1][(v & default_mask) as usize] += 1;
v >>= shift;
histograms[0][(v & default_mask) as usize] += 1;
}
}
} else if p.max_level == 4 {
for q in 0..quotient {
unsafe {
let i = q * 4;
let mut v0 = *arr.get_unchecked(i) as u32;
let mut v1 = *arr.get_unchecked(i + 1) as u32;
let mut v2 = *arr.get_unchecked(i + 2) as u32;
let mut v3 = *arr.get_unchecked(i + 3) as u32;
histograms[3][(v0 & default_mask) as usize] += 1;
histograms[3][(v1 & default_mask) as usize] += 1;
histograms[3][(v2 & default_mask) as usize] += 1;
histograms[3][(v3 & default_mask) as usize] += 1;
v0 >>= shift;
v1 >>= shift;
v2 >>= shift;
v3 >>= shift;
histograms[2][(v0 & default_mask) as usize] += 1;
histograms[2][(v1 & default_mask) as usize] += 1;
histograms[2][(v2 & default_mask) as usize] += 1;
histograms[2][(v3 & default_mask) as usize] += 1;
v0 >>= shift;
v1 >>= shift;
v2 >>= shift;
v3 >>= shift;
histograms[1][(v0 & default_mask) as usize] += 1;
histograms[1][(v1 & default_mask) as usize] += 1;
histograms[1][(v2 & default_mask) as usize] += 1;
histograms[1][(v3 & default_mask) as usize] += 1;
v0 >>= shift;
v1 >>= shift;
v2 >>= shift;
v3 >>= shift;
histograms[0][(v0 & default_mask) as usize] += 1;
histograms[0][(v1 & default_mask) as usize] += 1;
histograms[0][(v2 & default_mask) as usize] += 1;
histograms[0][(v3 & default_mask) as usize] += 1;
}
}
for i in 0..remainder {
unsafe {
let mut v = *arr.get_unchecked(offset + i) as u32;
histograms[3][(v & default_mask) as usize] += 1;
v >>= shift;
histograms[2][(v & default_mask) as usize] += 1;
v >>= shift;
histograms[1][(v & default_mask) as usize] += 1;
v >>= shift;
histograms[0][(v & default_mask) as usize] += 1;
}
}
}
histograms
}
fn voracious_sort(&self, arr: &mut [char]) {
if arr.len() <= 256 {
arr.sort_unstable_by(|a, b| a.partial_cmp(b).unwrap());
} else {
lsd_radixsort_heu(arr, 8, 11_000);
}
}
fn voracious_stable_sort(&self, arr: &mut [char]) {
self.voracious_sort(arr);
}
}