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sniping a peephole

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Jakub Doka 2024-10-21 17:29:11 +02:00
parent 73c9ccef6a
commit 0298b32e38
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1 changed files with 13 additions and 0 deletions
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13
lang/src/son.rs
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@ -305,6 +305,19 @@ impl Nodes {
return Some(self.new_node(ty, K::BinOp { op: T::Mul }, [ctrl, rhs, new_rhs]));
}
if op == T::Sub
&& self[lhs].kind == (K::BinOp { op: T::Add })
&& let K::CInt { value: a } = self[rhs].kind
&& let K::CInt { value: b } = self[self[lhs].inputs[2]].kind
{
let new_rhs = self.new_node_nop(ty, K::CInt { value: b - a }, [ctrl]);
return Some(self.new_node(ty, K::BinOp { op: T::Add }, [
ctrl,
self[lhs].inputs[1],
new_rhs,
]));
}
if op == T::Sub && self[lhs].kind == (K::BinOp { op }) {
// (a - b) - c => a - (b + c)
let &[_, a, b] = self[lhs].inputs.as_slice() else { unreachable!() };