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// Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
extern mod extra;
use extra::arena::Arena;
enum Tree<'self> {
Nil,
Node(&'self Tree<'self>, &'self Tree<'self>, int),
}
fn item_check(t: &Tree) -> int {
match *t {
Nil => { return 0; }
Node(left, right, item) => {
return item + item_check(left) - item_check(right);
}
}
}
fn bottom_up_tree<'r>(arena: &'r Arena, item: int, depth: int)
-> &'r Tree<'r> {
if depth > 0 {
return arena.alloc(
|| Node(bottom_up_tree(arena, 2 * item - 1, depth - 1),
bottom_up_tree(arena, 2 * item, depth - 1),
item));
}
return arena.alloc(|| Nil);
}
fn main() {
use std::os;
use std::int;
let args = std::os::args();
let args = if os::getenv("RUST_BENCH").is_some() {
~[~"", ~"17"]
} else if args.len() <= 1u {
~[~"", ~"8"]
} else {
args
};
let n = from_str::<int>(args[1]).unwrap();
let min_depth = 4;
let mut max_depth;
if min_depth + 2 > n {
max_depth = min_depth + 2;
} else {
max_depth = n;
}
let stretch_arena = Arena::new();
let stretch_depth = max_depth + 1;
let stretch_tree = bottom_up_tree(&stretch_arena, 0, stretch_depth);
printfln!("stretch tree of depth %d\t check: %d",
stretch_depth,
item_check(stretch_tree));
let long_lived_arena = Arena::new();
let long_lived_tree = bottom_up_tree(&long_lived_arena, 0, max_depth);
let mut depth = min_depth;
while depth <= max_depth {
let iterations = int::pow(2, (max_depth - depth + min_depth) as uint);
let mut chk = 0;
let mut i = 1;
while i <= iterations {
let mut temp_tree = bottom_up_tree(&long_lived_arena, i, depth);
chk += item_check(temp_tree);
temp_tree = bottom_up_tree(&long_lived_arena, -i, depth);
chk += item_check(temp_tree);
i += 1;
}
printfln!("%d\t trees of depth %d\t check: %d",
iterations * 2, depth, chk);
depth += 2;
}
printfln!("long lived tree of depth %d\t check: %d",
max_depth,
item_check(long_lived_tree));
}
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