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Reduced allocations in interpreter

This commit is contained in:
arkpar 2016-02-05 02:15:26 +01:00
parent a87edc2557
commit 97082ca807
1 changed files with 10 additions and 7 deletions
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17
ethcore/src/evm/interpreter.rs
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@ -263,7 +263,7 @@ pub struct Interpreter;
impl evm::Evm for Interpreter {
fn exec(&self, params: ActionParams, ext: &mut evm::Ext) -> evm::Result {
let code = &params.code.clone().unwrap();
let code = &params.code.as_ref().unwrap();
let valid_jump_destinations = self.find_jump_destinations(&code);
let mut current_gas = params.gas.clone();
@ -728,12 +728,15 @@ impl Interpreter {
let big_id = stack.pop_back();
let id = big_id.low_u64() as usize;
let max = id.wrapping_add(32);
let data = params.data.clone().unwrap_or_else(|| vec![]);
let bound = cmp::min(data.len(), max);
if id < bound && big_id < U256::from(data.len()) {
let mut v = data[id..bound].to_vec();
v.resize(32, 0);
stack.push(U256::from(&v[..]))
if let Some(data) = params.data.as_ref() {
let bound = cmp::min(data.len(), max);
if id < bound && big_id < U256::from(data.len()) {
let mut v = [0u8; 32];
v[0..bound-id].clone_from_slice(&data[id..bound]);
stack.push(U256::from(&v[..]))
} else {
stack.push(U256::zero())
}
} else {
stack.push(U256::zero())
}