Function try_fold_neg

compiler/src/modules/vm/optimizer.rs:242–262

(chunk: &mut SSAChunk, dead: &mut [bool], ip: usize)

}

fn try_fold_neg(chunk: &mut SSAChunk, dead: &mut [bool], ip: usize) {
    let Some(prev1_ip) = prev_live(dead, ip) else { return };
    let p1 = chunk.instructions[prev1_ip];
    if p1.opcode != OpCode::LoadConst { return; }
    let Some(v) = const_to_val(&chunk.constants, p1.operand) else { return };

    let folded = if v.is_int() {
        let r = -(v.as_int() as i128);
        if (Val::INT_MIN as i128..=Val::INT_MAX as i128).contains(&r) {
            Some(Val::int(r as i64))
        } else { None }
    } else if v.is_float() {
        Some(Val::float(-v.as_float()))
    } else { None };

    if let Some(r) = folded
        && write_const_load(chunk, prev1_ip, r)
    {
        dead[ip] = true;
    }
}

fn fold_binop(op: OpCode, a: Val, b: Val) -> Option<Val> {
    if matches!(op, OpCode::Eq | OpCode::NotEq | OpCode::Lt | OpCode::Gt | OpCode::LtEq | OpCode::GtEq) {