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This commit is contained in:
Daniel Lubarov 2022-07-31 20:37:05 -07:00
parent d639d0b311
commit 61a9839f2f
1 changed files with 27 additions and 3 deletions
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30
evm/src/cpu/kernel/optimizer.rs
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@ -44,14 +44,16 @@ fn constant_propagation(code: &mut Vec<Item>) {
} }
}); });
// Constant propagation for binary ops: `[PUSH x, PUSH y, BINOP] -> [PUSH BINOP(x, y)]` // Constant propagation for binary ops: `[PUSH y, PUSH x, BINOP] -> [PUSH BINOP(x, y)]`
replace_windows(code, |window| { replace_windows(code, |window| {
if let [Push(Literal(x)), Push(Literal(y)), StandardOp(op)] = window { if let [Push(Literal(y)), Push(Literal(x)), StandardOp(op)] = window {
match op.as_str() { match op.as_str() {
"ADD" => Some(vec![Push(Literal(x + y))]), "ADD" => Some(vec![Push(Literal(x + y))]),
"SUB" => Some(vec![Push(Literal(x - y))]), "SUB" => Some(vec![Push(Literal(x - y))]),
"MUL" => Some(vec![Push(Literal(x * y))]), "MUL" => Some(vec![Push(Literal(x * y))]),
"DIV" => Some(vec![Push(Literal(x / y))]), "DIV" => Some(vec![Push(Literal(
x.checked_div(y).unwrap_or(U256::zero()),
))]),
_ => None, _ => None,
} }
} else { } else {
@ -108,6 +110,28 @@ mod tests {
assert_eq!(code, vec![Push(Literal(12.into()))]); assert_eq!(code, vec![Push(Literal(12.into()))]);
} }
#[test]
fn test_constant_propagation_div() {
let mut code = vec![
Push(Literal(3.into())),
Push(Literal(8.into())),
StandardOp("DIV".into()),
];
constant_propagation(&mut code);
assert_eq!(code, vec![Push(Literal(2.into()))]);
}
#[test]
fn test_constant_propagation_div_zero() {
let mut code = vec![
Push(Literal(0.into())),
Push(Literal(1.into())),
StandardOp("DIV".into()),
];
constant_propagation(&mut code);
assert_eq!(code, vec![Push(Literal(0.into()))]);
}
#[test] #[test]
fn test_no_op_jump() { fn test_no_op_jump() {
let mut code = vec![ let mut code = vec![