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-rw-r--r--test/bench/garbage/tree.go100
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diff --git a/test/bench/garbage/tree.go b/test/bench/garbage/tree.go
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+/*
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+
+ * Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+
+ * Neither the name of "The Computer Language Benchmarks Game" nor the
+ name of "The Computer Language Shootout Benchmarks" nor the names of
+ its contributors may be used to endorse or promote products derived
+ from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+*/
+
+/* The Computer Language Benchmarks Game
+ * https://benchmarksgame-team.pages.debian.net/benchmarksgame/
+ *
+ * contributed by The Go Authors.
+ * based on C program by Kevin Carson
+ */
+
+package main
+
+import (
+ "flag"
+ "fmt"
+ "time"
+)
+
+var n = flag.Int("n", 16, "depth")
+
+type Node struct {
+ item int
+ left, right *Node
+}
+
+func bottomUpTree(item, depth int) *Node {
+ if depth <= 0 {
+ return &Node{item: item}
+ }
+ return &Node{item, bottomUpTree(2*item-1, depth-1), bottomUpTree(2*item, depth-1)}
+}
+
+func (n *Node) itemCheck() int {
+ if n.left == nil {
+ return n.item
+ }
+ return n.item + n.left.itemCheck() - n.right.itemCheck()
+}
+
+const minDepth = 4
+
+func main() {
+ flag.Parse()
+
+ t0 := time.Now()
+
+ maxDepth := *n
+ if minDepth+2 > *n {
+ maxDepth = minDepth + 2
+ }
+ stretchDepth := maxDepth + 1
+
+ check := bottomUpTree(0, stretchDepth).itemCheck()
+ fmt.Printf("stretch tree of depth %d\t check: %d\n", stretchDepth, check)
+
+ longLivedTree := bottomUpTree(0, maxDepth)
+
+ for depth := minDepth; depth <= maxDepth; depth += 2 {
+ iterations := 1 << uint(maxDepth-depth+minDepth)
+ check = 0
+
+ for i := 1; i <= iterations; i++ {
+ check += bottomUpTree(i, depth).itemCheck()
+ check += bottomUpTree(-i, depth).itemCheck()
+ }
+ fmt.Printf("%d\t trees of depth %d\t check: %d\n", iterations*2, depth, check)
+ }
+ fmt.Printf("long lived tree of depth %d\t check: %d\n", maxDepth, longLivedTree.itemCheck())
+
+ t1 := time.Now()
+
+ // Standard gotest benchmark output, collected by build dashboard.
+ gcstats("BenchmarkTree", *n, t1.Sub(t0))
+}