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dep_node: Add comment about method specialization being just a performance optimization

This commit is contained in:
Michael Woerister 2017-06-13 17:11:53 +02:00
parent 5b5499d5e6
commit e323652728
1 changed files with 6 additions and 0 deletions
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6
src/librustc/dep_graph/dep_node.rs
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@ -526,6 +526,9 @@ impl<'a, 'gcx: 'tcx + 'a, 'tcx: 'a> DepNodeParams<'a, 'gcx, 'tcx> for (DefId,) {
impl<'a, 'gcx: 'tcx + 'a, 'tcx: 'a> DepNodeParams<'a, 'gcx, 'tcx> for (DefId, DefId) {
const CAN_RECONSTRUCT_QUERY_KEY: bool = false;
// We actually would not need to specialize the implementation of this
// method but it's faster to combine the hashes than to instantiate a full
// hashing context and stable-hashing state.
fn to_fingerprint(&self, tcx: TyCtxt) -> Fingerprint {
let (def_id_0, def_id_1) = *self;
@ -548,6 +551,9 @@ impl<'a, 'gcx: 'tcx + 'a, 'tcx: 'a> DepNodeParams<'a, 'gcx, 'tcx> for (DefId, De
impl<'a, 'gcx: 'tcx + 'a, 'tcx: 'a> DepNodeParams<'a, 'gcx, 'tcx> for (DefIdList,) {
const CAN_RECONSTRUCT_QUERY_KEY: bool = false;
// We actually would not need to specialize the implementation of this
// method but it's faster to combine the hashes than to instantiate a full
// hashing context and stable-hashing state.
fn to_fingerprint(&self, tcx: TyCtxt) -> Fingerprint {
let mut fingerprint = Fingerprint::zero();