diff options
| -rw-r--r-- | src/bootstrap/metadata.rs | 2 | ||||
| -rw-r--r-- | src/librustc_driver/profile/trace.rs | 3 |
2 files changed, 3 insertions, 2 deletions
diff --git a/src/bootstrap/metadata.rs b/src/bootstrap/metadata.rs index 718a6da3637..fa0b1983510 100644 --- a/src/bootstrap/metadata.rs +++ b/src/bootstrap/metadata.rs @@ -51,7 +51,7 @@ pub fn build(build: &mut Build) { build_krate("", build, &mut resolves, "src/libtest"); build_krate(&build.rustc_features(), build, &mut resolves, "src/rustc"); - let mut id2name = HashMap::new(); + let mut id2name = HashMap::with_capacity(build.crates.len()); for (name, krate) in build.crates.iter() { id2name.insert(krate.id.clone(), name.clone()); } diff --git a/src/librustc_driver/profile/trace.rs b/src/librustc_driver/profile/trace.rs index 6426286ccbc..5f10c56e8e2 100644 --- a/src/librustc_driver/profile/trace.rs +++ b/src/librustc_driver/profile/trace.rs @@ -220,7 +220,8 @@ pub fn write_counts(count_file: &mut File, counts: &mut HashMap<String,QueryMetr } pub fn write_traces(html_file: &mut File, counts_file: &mut File, traces: &Vec<Rec>) { - let mut counts : HashMap<String,QueryMetric> = HashMap::new(); + let capacity = traces.iter().fold(0, |acc, t| acc + 1 + t.extent.len()); + let mut counts : HashMap<String, QueryMetric> = HashMap::with_capacity(capacity); compute_counts_rec(&mut counts, traces); write_counts(counts_file, &mut counts); |