lame benchmark of if/elseif/else versus switch/case/default

if is faster :
$ php bench_if_switch.php --count 20000
20000 times: function bench_if_switch->doElseIf() :
   204.64ms (  0.01ms each)
20000 times: function bench_if_switch->doSwitch() :
   272.98ms (  0.01ms each)

diff --git a/maintenance/benchmarks/bench_if_switch.php b/maintenance/benchmarks/bench_if_switch.php
new file mode 100644 (file)
index 0000000..1f46bca
--- /dev/null
+++ b/maintenance/benchmarks/bench_if_switch.php
@@ -0,0 +1,88 @@
+<?php
+/**
+ * This come from r75429 message
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ * @ingroup Maintenance
+ * @author Platonides 
+ */
+
+require_once( dirname( __FILE__ ) . '/Benchmarker.php' );
+class bench_if_switch extends Benchmarker {
+
+       public function __construct() {
+               parent::__construct();
+               $this->mDescription = "Benchmark if elseif... versus switch case.";
+       }
+
+       public function execute() {
+               $this->bench( array(
+                       array( 'function' => array( $this, 'doElseIf' ) ),
+                       array( 'function' => array( $this, 'doSwitch' ) ),
+               ));
+               print $this->getFormattedResults();
+       }
+
+       // bench function 1
+       function doElseIf() {
+               $a = 'z';
+               if( $a == 'a') {}
+               elseif( $a == 'b') {}
+               elseif( $a == 'c') {}
+               elseif( $a == 'd') {}
+               elseif( $a == 'e') {}
+               elseif( $a == 'f') {}
+               elseif( $a == 'g') {}
+               elseif( $a == 'h') {}
+               elseif( $a == 'i') {}
+               elseif( $a == 'j') {}
+               elseif( $a == 'k') {}
+               elseif( $a == 'l') {}
+               elseif( $a == 'm') {}
+               elseif( $a == 'n') {}
+               elseif( $a == 'o') {}
+               elseif( $a == 'p') {}
+               else {}
+       }
+
+       // bench function 2
+       function doSwitch() {
+               $a = 'z';
+               switch( $a ) {
+                       case 'b': break;
+                       case 'c': break;
+                       case 'd': break;
+                       case 'e': break;
+                       case 'f': break;
+                       case 'g': break;
+                       case 'h': break;
+                       case 'i': break;
+                       case 'j': break;
+                       case 'k': break;
+                       case 'l': break;
+                       case 'm': break;
+                       case 'n': break;
+                       case 'o': break;
+                       case 'p': break;
+                       default:
+               }
+       }
+}
+
+$maintClass = 'bench_if_switch';
+require_once( DO_MAINTENANCE );