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peepmatic: Represent various id types with u16

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These ids end up in the automaton, so making them smaller should give us better
data cache locality and also smaller serialized sizes.
This commit is contained in:
Nick Fitzgerald
2020-05-07 13:56:02 -07:00
parent 469104c4d3
commit 210b036320
7 changed files with 27 additions and 27 deletions
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17
cranelift/peepmatic/crates/runtime/src/integer_interner.rs
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@@ -7,11 +7,11 @@
use serde::{Deserialize, Serialize};
use std::collections::BTreeMap;
use std::num::NonZeroU32;
use std::num::{NonZeroU16, NonZeroU32};
/// An identifier for an interned integer.
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct IntegerId(#[doc(hidden)] pub NonZeroU32);
pub struct IntegerId(#[doc(hidden)] pub NonZeroU16);
/// An interner for integer values.
#[derive(Debug, Default, Serialize, Deserialize)]
@@ -40,8 +40,8 @@ impl IntegerInterner {
return *id;
}
assert!((self.values.len() as u64) < (std::u32::MAX as u64));
let id = IntegerId(unsafe { NonZeroU32::new_unchecked(self.values.len() as u32 + 1) });
assert!((self.values.len() as u64) < (std::u16::MAX as u64));
let id = IntegerId(unsafe { NonZeroU16::new_unchecked(self.values.len() as u16 + 1) });
self.values.push(value);
self.map.insert(value, id);
@@ -65,16 +65,9 @@ impl IntegerInterner {
}
}
impl From<IntegerId> for u32 {
#[inline]
fn from(id: IntegerId) -> u32 {
id.0.get()
}
}
impl From<IntegerId> for NonZeroU32 {
#[inline]
fn from(id: IntegerId) -> NonZeroU32 {
id.0
id.0.into()
}
}