Index: wp-includes/functions.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- wp-includes/functions.php	(revision 006ae74d4cc6126d31079b6749fb167091dcbce4)
+++ wp-includes/functions.php	(revision )
@@ -1359,14 +1359,10 @@
 		return true;
 
 	$suppress = $wpdb->suppress_errors();
-	if ( ! wp_installing() ) {
-		$alloptions = wp_load_alloptions();
-	}
+
 	// If siteurl is not set to autoload, check it specifically
-	if ( !isset( $alloptions['siteurl'] ) )
-		$installed = $wpdb->get_var( "SELECT option_value FROM $wpdb->options WHERE option_name = 'siteurl'" );
-	else
-		$installed = $alloptions['siteurl'];
+	$installed = get_option( 'siteurl' );
+
 	$wpdb->suppress_errors( $suppress );
 
 	$installed = !empty( $installed );