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perf: reduce allocations in Boolean's SignExtend impl
Signed-off-by: ljedrz <ljedrz@gmail.com>
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@ -16,6 +16,8 @@
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use snarkos_models::gadgets::utilities::boolean::Boolean;
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use std::iter;
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/// Sign extends an array of bits to the desired length.
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/// Expects least significant bit first
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pub trait SignExtend
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@ -30,10 +32,10 @@ impl SignExtend for Boolean {
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fn sign_extend(bits: &[Boolean], length: usize) -> Vec<Boolean> {
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let msb = bits.last().expect("empty bit list");
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let bits_needed = length - bits.len();
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let mut extension = vec![*msb; bits_needed];
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let mut result = Vec::from(bits);
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result.append(&mut extension);
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let mut result = Vec::with_capacity(length);
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result.extend_from_slice(bits);
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result.extend(iter::repeat(*msb).take(bits_needed));
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result
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}
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