From 1b6a04ca5504955c571d1c97504fb45ea0befee4 Mon Sep 17 00:00:00 2001 From: Valentin Popov Date: Mon, 8 Jan 2024 01:21:28 +0400 Subject: Initial vendor packages Signed-off-by: Valentin Popov --- vendor/rayon/src/slice/chunks.rs | 389 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 389 insertions(+) create mode 100644 vendor/rayon/src/slice/chunks.rs (limited to 'vendor/rayon/src/slice/chunks.rs') diff --git a/vendor/rayon/src/slice/chunks.rs b/vendor/rayon/src/slice/chunks.rs new file mode 100644 index 0000000..a3cc709 --- /dev/null +++ b/vendor/rayon/src/slice/chunks.rs @@ -0,0 +1,389 @@ +use crate::iter::plumbing::*; +use crate::iter::*; +use crate::math::div_round_up; +use std::cmp; + +/// Parallel iterator over immutable non-overlapping chunks of a slice +#[derive(Debug)] +pub struct Chunks<'data, T: Sync> { + chunk_size: usize, + slice: &'data [T], +} + +impl<'data, T: Sync> Chunks<'data, T> { + pub(super) fn new(chunk_size: usize, slice: &'data [T]) -> Self { + Self { chunk_size, slice } + } +} + +impl<'data, T: Sync> Clone for Chunks<'data, T> { + fn clone(&self) -> Self { + Chunks { ..*self } + } +} + +impl<'data, T: Sync + 'data> ParallelIterator for Chunks<'data, T> { + type Item = &'data [T]; + + fn drive_unindexed(self, consumer: C) -> C::Result + where + C: UnindexedConsumer, + { + bridge(self, consumer) + } + + fn opt_len(&self) -> Option { + Some(self.len()) + } +} + +impl<'data, T: Sync + 'data> IndexedParallelIterator for Chunks<'data, T> { + fn drive(self, consumer: C) -> C::Result + where + C: Consumer, + { + bridge(self, consumer) + } + + fn len(&self) -> usize { + div_round_up(self.slice.len(), self.chunk_size) + } + + fn with_producer(self, callback: CB) -> CB::Output + where + CB: ProducerCallback, + { + callback.callback(ChunksProducer { + chunk_size: self.chunk_size, + slice: self.slice, + }) + } +} + +struct ChunksProducer<'data, T: Sync> { + chunk_size: usize, + slice: &'data [T], +} + +impl<'data, T: 'data + Sync> Producer for ChunksProducer<'data, T> { + type Item = &'data [T]; + type IntoIter = ::std::slice::Chunks<'data, T>; + + fn into_iter(self) -> Self::IntoIter { + self.slice.chunks(self.chunk_size) + } + + fn split_at(self, index: usize) -> (Self, Self) { + let elem_index = cmp::min(index * self.chunk_size, self.slice.len()); + let (left, right) = self.slice.split_at(elem_index); + ( + ChunksProducer { + chunk_size: self.chunk_size, + slice: left, + }, + ChunksProducer { + chunk_size: self.chunk_size, + slice: right, + }, + ) + } +} + +/// Parallel iterator over immutable non-overlapping chunks of a slice +#[derive(Debug)] +pub struct ChunksExact<'data, T: Sync> { + chunk_size: usize, + slice: &'data [T], + rem: &'data [T], +} + +impl<'data, T: Sync> ChunksExact<'data, T> { + pub(super) fn new(chunk_size: usize, slice: &'data [T]) -> Self { + let rem_len = slice.len() % chunk_size; + let len = slice.len() - rem_len; + let (slice, rem) = slice.split_at(len); + Self { + chunk_size, + slice, + rem, + } + } + + /// Return the remainder of the original slice that is not going to be + /// returned by the iterator. The returned slice has at most `chunk_size-1` + /// elements. + pub fn remainder(&self) -> &'data [T] { + self.rem + } +} + +impl<'data, T: Sync> Clone for ChunksExact<'data, T> { + fn clone(&self) -> Self { + ChunksExact { ..*self } + } +} + +impl<'data, T: Sync + 'data> ParallelIterator for ChunksExact<'data, T> { + type Item = &'data [T]; + + fn drive_unindexed(self, consumer: C) -> C::Result + where + C: UnindexedConsumer, + { + bridge(self, consumer) + } + + fn opt_len(&self) -> Option { + Some(self.len()) + } +} + +impl<'data, T: Sync + 'data> IndexedParallelIterator for ChunksExact<'data, T> { + fn drive(self, consumer: C) -> C::Result + where + C: Consumer, + { + bridge(self, consumer) + } + + fn len(&self) -> usize { + self.slice.len() / self.chunk_size + } + + fn with_producer(self, callback: CB) -> CB::Output + where + CB: ProducerCallback, + { + callback.callback(ChunksExactProducer { + chunk_size: self.chunk_size, + slice: self.slice, + }) + } +} + +struct ChunksExactProducer<'data, T: Sync> { + chunk_size: usize, + slice: &'data [T], +} + +impl<'data, T: 'data + Sync> Producer for ChunksExactProducer<'data, T> { + type Item = &'data [T]; + type IntoIter = ::std::slice::ChunksExact<'data, T>; + + fn into_iter(self) -> Self::IntoIter { + self.slice.chunks_exact(self.chunk_size) + } + + fn split_at(self, index: usize) -> (Self, Self) { + let elem_index = index * self.chunk_size; + let (left, right) = self.slice.split_at(elem_index); + ( + ChunksExactProducer { + chunk_size: self.chunk_size, + slice: left, + }, + ChunksExactProducer { + chunk_size: self.chunk_size, + slice: right, + }, + ) + } +} + +/// Parallel iterator over mutable non-overlapping chunks of a slice +#[derive(Debug)] +pub struct ChunksMut<'data, T: Send> { + chunk_size: usize, + slice: &'data mut [T], +} + +impl<'data, T: Send> ChunksMut<'data, T> { + pub(super) fn new(chunk_size: usize, slice: &'data mut [T]) -> Self { + Self { chunk_size, slice } + } +} + +impl<'data, T: Send + 'data> ParallelIterator for ChunksMut<'data, T> { + type Item = &'data mut [T]; + + fn drive_unindexed(self, consumer: C) -> C::Result + where + C: UnindexedConsumer, + { + bridge(self, consumer) + } + + fn opt_len(&self) -> Option { + Some(self.len()) + } +} + +impl<'data, T: Send + 'data> IndexedParallelIterator for ChunksMut<'data, T> { + fn drive(self, consumer: C) -> C::Result + where + C: Consumer, + { + bridge(self, consumer) + } + + fn len(&self) -> usize { + div_round_up(self.slice.len(), self.chunk_size) + } + + fn with_producer(self, callback: CB) -> CB::Output + where + CB: ProducerCallback, + { + callback.callback(ChunksMutProducer { + chunk_size: self.chunk_size, + slice: self.slice, + }) + } +} + +struct ChunksMutProducer<'data, T: Send> { + chunk_size: usize, + slice: &'data mut [T], +} + +impl<'data, T: 'data + Send> Producer for ChunksMutProducer<'data, T> { + type Item = &'data mut [T]; + type IntoIter = ::std::slice::ChunksMut<'data, T>; + + fn into_iter(self) -> Self::IntoIter { + self.slice.chunks_mut(self.chunk_size) + } + + fn split_at(self, index: usize) -> (Self, Self) { + let elem_index = cmp::min(index * self.chunk_size, self.slice.len()); + let (left, right) = self.slice.split_at_mut(elem_index); + ( + ChunksMutProducer { + chunk_size: self.chunk_size, + slice: left, + }, + ChunksMutProducer { + chunk_size: self.chunk_size, + slice: right, + }, + ) + } +} + +/// Parallel iterator over mutable non-overlapping chunks of a slice +#[derive(Debug)] +pub struct ChunksExactMut<'data, T: Send> { + chunk_size: usize, + slice: &'data mut [T], + rem: &'data mut [T], +} + +impl<'data, T: Send> ChunksExactMut<'data, T> { + pub(super) fn new(chunk_size: usize, slice: &'data mut [T]) -> Self { + let rem_len = slice.len() % chunk_size; + let len = slice.len() - rem_len; + let (slice, rem) = slice.split_at_mut(len); + Self { + chunk_size, + slice, + rem, + } + } + + /// Return the remainder of the original slice that is not going to be + /// returned by the iterator. The returned slice has at most `chunk_size-1` + /// elements. + /// + /// Note that this has to consume `self` to return the original lifetime of + /// the data, which prevents this from actually being used as a parallel + /// iterator since that also consumes. This method is provided for parity + /// with `std::iter::ChunksExactMut`, but consider calling `remainder()` or + /// `take_remainder()` as alternatives. + pub fn into_remainder(self) -> &'data mut [T] { + self.rem + } + + /// Return the remainder of the original slice that is not going to be + /// returned by the iterator. The returned slice has at most `chunk_size-1` + /// elements. + /// + /// Consider `take_remainder()` if you need access to the data with its + /// original lifetime, rather than borrowing through `&mut self` here. + pub fn remainder(&mut self) -> &mut [T] { + self.rem + } + + /// Return the remainder of the original slice that is not going to be + /// returned by the iterator. The returned slice has at most `chunk_size-1` + /// elements. Subsequent calls will return an empty slice. + pub fn take_remainder(&mut self) -> &'data mut [T] { + std::mem::take(&mut self.rem) + } +} + +impl<'data, T: Send + 'data> ParallelIterator for ChunksExactMut<'data, T> { + type Item = &'data mut [T]; + + fn drive_unindexed(self, consumer: C) -> C::Result + where + C: UnindexedConsumer, + { + bridge(self, consumer) + } + + fn opt_len(&self) -> Option { + Some(self.len()) + } +} + +impl<'data, T: Send + 'data> IndexedParallelIterator for ChunksExactMut<'data, T> { + fn drive(self, consumer: C) -> C::Result + where + C: Consumer, + { + bridge(self, consumer) + } + + fn len(&self) -> usize { + self.slice.len() / self.chunk_size + } + + fn with_producer(self, callback: CB) -> CB::Output + where + CB: ProducerCallback, + { + callback.callback(ChunksExactMutProducer { + chunk_size: self.chunk_size, + slice: self.slice, + }) + } +} + +struct ChunksExactMutProducer<'data, T: Send> { + chunk_size: usize, + slice: &'data mut [T], +} + +impl<'data, T: 'data + Send> Producer for ChunksExactMutProducer<'data, T> { + type Item = &'data mut [T]; + type IntoIter = ::std::slice::ChunksExactMut<'data, T>; + + fn into_iter(self) -> Self::IntoIter { + self.slice.chunks_exact_mut(self.chunk_size) + } + + fn split_at(self, index: usize) -> (Self, Self) { + let elem_index = index * self.chunk_size; + let (left, right) = self.slice.split_at_mut(elem_index); + ( + ChunksExactMutProducer { + chunk_size: self.chunk_size, + slice: left, + }, + ChunksExactMutProducer { + chunk_size: self.chunk_size, + slice: right, + }, + ) + } +} -- cgit v1.2.3