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Replace HashMap with ArrayMap

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Improve performance 1-2%
This commit is contained in:
Christopher Berner 2019-02-10 16:03:44 -08:00
parent 0c222a1f59
commit 2ebe217f52
1 changed files with 2 additions and 3 deletions
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5
src/base.rs
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@ -9,7 +9,6 @@ use systematic_constants::num_hdpc_symbols;
use systematic_constants::calculate_p1;
use symbol::Symbol;
use matrix::OctetMatrix;
use std::collections::HashMap;
use octet::Octet;
use arraymap::ArrayMap;
use petgraph::prelude::*;
@ -652,13 +651,13 @@ impl IntermediateSymbolDecoder {
self.fifth_phase();
// See end of section 5.4.2.1
let mut index_mapping = HashMap::new();
let mut index_mapping = ArrayMap::new(0, self.L);
for i in 0..self.L {
index_mapping.insert(self.c[i], self.d[i]);
}
let mut result = vec![];
for i in 0..self.L {
result.push(self.D[index_mapping[&i]].clone());
result.push(self.D[index_mapping.get(i)].clone());
}
Some(result)
}