binary-trees Hack program
source code
<?hh
/* The Computer Language Benchmarks Game
http://benchmarksgame.alioth.debian.org/
contributed by Peter Baltruschat
modified by Levi Cameron
PHP as HHVM/Hack by Isaac Gouy
*reset*
*/
class Node {
public $l;
public $r;
}
function bottomUpTree($depth)
{
$node = new Node();
if (!$depth) return $node;
$depth--;
$node->l = bottomUpTree($depth);
$node->r = bottomUpTree($depth);
return $node;
}
function itemCheck($treeNode) {
return 1
+ ($treeNode->l->l === null ? 1 : itemCheck($treeNode->l))
+ ($treeNode->r->l === null ? 1 : itemCheck($treeNode->r));
}
$minDepth = 4;
$n = ($argc == 2) ? $argv[1] : 1;
$maxDepth = max($minDepth + 2, $n);
$stretchDepth = $maxDepth + 1;
$stretchTree = bottomUpTree($stretchDepth);
printf("stretch tree of depth %d\t check: %d\n", $stretchDepth, itemCheck($stretchTree));
unset($stretchTree);
$longLivedTree = bottomUpTree($maxDepth);
$iterations = 1 << ($maxDepth);
do
{
$check = 0;
for($i = 1; $i <= $iterations; ++$i)
{
$t = bottomUpTree($minDepth);
$check += itemCheck($t);
unset($t);
}
printf("%d\t trees of depth %d\t check: %d\n", $iterations, $minDepth, $check);
$minDepth += 2;
$iterations >>= 2;
}
while($minDepth <= $maxDepth);
printf("long lived tree of depth %d\t check: %d\n",
$maxDepth, itemCheck($longLivedTree));
notes, command-line, and program output
NOTES:
64-bit Ubuntu quad core
HipHop VM 3.21.0 (rel)
Compiler: 3.21.0+dfsg-2
Repo schema: 1c159cf2047dca5f4a3363b2138a33e14a1e99fa
Wed, 15 Nov 2017 22:12:36 GMT
MAKE:
/usr/bin/hh_client
No errors!
0.03s to complete and log all make actions
COMMAND LINE:
/usr/bin/hhvm -d hhvm.hack.lang.look_for_typechecker=0 binarytrees.hack 21
PROGRAM OUTPUT:
stretch tree of depth 22 check: 8388607
2097152 trees of depth 4 check: 65011712
524288 trees of depth 6 check: 66584576
131072 trees of depth 8 check: 66977792
32768 trees of depth 10 check: 67076096
8192 trees of depth 12 check: 67100672
2048 trees of depth 14 check: 67106816
512 trees of depth 16 check: 67108352
128 trees of depth 18 check: 67108736
32 trees of depth 20 check: 67108832
long lived tree of depth 21 check: 4194303