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Check if the array contents are already the same, massive performance improvement for Anvil in a lot of cases

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This commit is contained in:
Dylan K. Taylor 2017-01-18 20:04:19 +00:00
parent 7de7593b89
commit e4c889ae16
1 changed files with 33 additions and 26 deletions
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59
src/pocketmine/level/format/io/ChunkUtils.php
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@ -34,19 +34,22 @@ class ChunkUtils{
*/
public static final function reorderByteArray(string $array) : string{
$result = str_repeat("\x00", 4096);
$i = 0;
$zM = 0;
$yM = 0;
for($x = 0; $x < 16; ++$x){
$zM = $x + 256;
for($z = $x; $z < $zM; $z += 16){
$yM = $z + 4096;
for($y = $z; $y < $yM; $y += 256){
$result{$i} = $array{$y};
++$i;
if($array !== $result){
$i = 0;
$zM = 0;
$yM = 0;
for($x = 0; $x < 16; ++$x){
$zM = $x + 256;
for($z = $x; $z < $zM; $z += 16){
$yM = $z + 4096;
for($y = $z; $y < $yM; $y += 256){
$result{$i} = $array{$y};
++$i;
}
}
}
}
return $result;
}
@ -60,26 +63,30 @@ class ChunkUtils{
*/
public static final function reorderNibbleArray(string $array, string $commonValue = "\x00") : string{
$result = str_repeat($commonValue, 2048);
$i = 0;
for($x = 0; $x < 8; ++$x){
for($z = 0; $z < 16; ++$z){
$zx = (($z << 3) | $x);
for($y = 0; $y < 8; ++$y){
$j = (($y << 8) | $zx);
$j80 = ($j | 0x80);
if($array{$j} === $commonValue and $array{$j80} === $commonValue){
//values are already filled
}else{
$i1 = ord($array{$j});
$i2 = ord($array{$j80});
$result{$i} = chr(($i2 << 4) | ($i1 & 0x0f));
$result{$i | 0x80} = chr(($i1 >> 4) | ($i2 & 0xf0));
if($array !== $result){
$i = 0;
for($x = 0; $x < 8; ++$x){
for($z = 0; $z < 16; ++$z){
$zx = (($z << 3) | $x);
for($y = 0; $y < 8; ++$y){
$j = (($y << 8) | $zx);
$j80 = ($j | 0x80);
if($array{$j} === $commonValue and $array{$j80} === $commonValue){
//values are already filled
}else{
$i1 = ord($array{$j});
$i2 = ord($array{$j80});
$result{$i} = chr(($i2 << 4) | ($i1 & 0x0f));
$result{$i | 0x80} = chr(($i1 >> 4) | ($i2 & 0xf0));
}
$i++;
}
$i++;
}
$i += 128;
}
$i += 128;
}
return $result;
}