// Copyright (C) 2020 Second State.
// This file is part of Rust-SSVM.

// Rust-SSVM is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.

// Rust-SSVM is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.

// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

object "fib" {
  code {
    let f := 1
    let s := 1
    let next
    for { let i := 0 } ltu256(i, 10) { i := addu256(i, 1)}
    {
      if ltu256(i, 2) {
        sstore(i, 1)
      }
      if gtu256(i, 1) {
        next := addu256(s, f)
        f := s
        s := next
        sstore(i, s)
      }
    }
    mstore(0, next)
    return(0, 32)
  }
  // Unreferenced data is not added to the assembled bytecode.
  data "str" "Yul Fibonacci"
}