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This commit is contained in:
John Kåre Alsaker 2023-05-28 15:54:52 +02:00
parent 5843858c01
commit 8abafd085a
1 changed files with 4 additions and 0 deletions
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4
compiler/rustc_data_structures/src/sharded.rs
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@ -20,6 +20,9 @@ pub const SHARDS: usize = 1 << SHARD_BITS;
/// An array of cache-line aligned inner locked structures with convenience methods. /// An array of cache-line aligned inner locked structures with convenience methods.
pub struct Sharded<T> { pub struct Sharded<T> {
/// This mask is used to ensure that accesses are inbounds of `shards`.
/// When dynamic thread safety is off, this field is set to 0 causing only
/// a single shard to be used for greater cache efficiency.
#[cfg(parallel_compiler)] #[cfg(parallel_compiler)]
mask: usize, mask: usize,
shards: [CacheAligned<Lock<T>>; SHARDS], shards: [CacheAligned<Lock<T>>; SHARDS],
@ -56,6 +59,7 @@ impl<T> Sharded<T> {
#[inline(always)] #[inline(always)]
fn count(&self) -> usize { fn count(&self) -> usize {
// `self.mask` is always one below the used shard count
self.mask() + 1 self.mask() + 1
} }