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Remove useless access to archetype in UnsafeWorldCell::fetch_table (#7665)

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# Objective

- #6402 changed `World::fetch_table` (now `UnsafeWorldCell::fetch_table`) to access the archetype in order to get the `table_id` and `table_row` of the entity involved. However this is useless since those were already present in the `EntityLocation`
- Moreover it's useless for `UnsafeWorldCell::fetch_table` to return the `TableRow` too, since the caller must already have access to the `EntityLocation` which contains the `TableRow`.
- The result is that `UnsafeWorldCell::fetch_table` now only does 2 memory fetches instead of 4.

## Solution

- Revert the changes to the implementation of `UnsafeWorldCell::fetch_table` made in #6402
This commit is contained in:
Giacomo Stevanato 2023-02-15 04:39:18 +00:00
parent 11a7ff2645
commit 8d51f4a2a5
1 changed files with 11 additions and 15 deletions
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26
crates/bevy_ecs/src/world/unsafe_world_cell.rs
View File

@ -10,7 +10,7 @@ use crate::{
},
entity::{Entities, Entity, EntityLocation},
prelude::Component,
storage::{Column, ComponentSparseSet, TableRow},
storage::{Column, ComponentSparseSet},
system::Resource,
};
use bevy_ptr::Ptr;
@ -754,14 +754,10 @@ impl<'w> UnsafeWorldCell<'w> {
self,
location: EntityLocation,
component_id: ComponentId,
) -> Option<(&'w Column, TableRow)> {
let archetype = &self.archetypes()[location.archetype_id];
) -> Option<&'w Column> {
// SAFETY: caller ensures returned data is not misused and we have not created any borrows
// of component/resource data
let table = &unsafe { self.unsafe_world() }.storages.tables[archetype.table_id()];
let components = table.get_column(component_id)?;
let table_row = archetype.entity_table_row(location.archetype_row);
Some((components, table_row))
unsafe { self.unsafe_world() }.storages.tables[location.table_id].get_column(component_id)
}
#[inline]
@ -799,9 +795,9 @@ unsafe fn get_component(
// SAFETY: component_id exists and is therefore valid
match storage_type {
StorageType::Table => {
let (components, table_row) = world.fetch_table(location, component_id)?;
let components = world.fetch_table(location, component_id)?;
// SAFETY: archetypes only store valid table_rows and caller ensure aliasing rules
Some(components.get_data_unchecked(table_row))
Some(components.get_data_unchecked(location.table_row))
}
StorageType::SparseSet => world.fetch_sparse_set(component_id)?.get(entity),
}
@ -825,14 +821,14 @@ unsafe fn get_component_and_ticks(
) -> Option<(Ptr<'_>, TickCells<'_>)> {
match storage_type {
StorageType::Table => {
let (components, table_row) = world.fetch_table(location, component_id)?;
let components = world.fetch_table(location, component_id)?;
// SAFETY: archetypes only store valid table_rows and caller ensure aliasing rules
Some((
components.get_data_unchecked(table_row),
components.get_data_unchecked(location.table_row),
TickCells {
added: components.get_added_ticks_unchecked(table_row),
changed: components.get_changed_ticks_unchecked(table_row),
added: components.get_added_ticks_unchecked(location.table_row),
changed: components.get_changed_ticks_unchecked(location.table_row),
},
))
}
@ -859,9 +855,9 @@ unsafe fn get_ticks(
) -> Option<ComponentTicks> {
match storage_type {
StorageType::Table => {
let (components, table_row) = world.fetch_table(location, component_id)?;
let components = world.fetch_table(location, component_id)?;
// SAFETY: archetypes only store valid table_rows and caller ensure aliasing rules
Some(components.get_ticks_unchecked(table_row))
Some(components.get_ticks_unchecked(location.table_row))
}
StorageType::SparseSet => world.fetch_sparse_set(component_id)?.get_ticks(entity),
}