--- a/example/bitonic_sort/ppe/swap.cc	Thu Feb 05 23:48:49 2015 +0900
+++ b/example/bitonic_sort/ppe/swap.cc	Fri Feb 06 00:20:01 2015 +0900
@@ -10,22 +10,21 @@
     int index = s->x;
     long block = (long)s->get_param(0);
     long dist = (long)s->get_param(1);
-    long sp = (long)s->get_param(2);
+    long diff = (long)s->get_param(2);
 
-    int x = index/block;
-    int y = index/sp;
-    int i = index+sp*y;
-    int temp = inData[i];
+    int spot = index/block;
+    index = index+diff*(index/diff);
+    int temp = inData[index];
 
-    if (x%2 == 0) {
-        if (inData[i+dist] < inData[i]) {
-            outData[i] = inData[i+dist];
-            outData[i+dist] = temp;
+    if (spot%2 == 0) {
+        if (inData[index+dist] < inData[index]) {
+            outData[index] = inData[index+dist];
+            outData[index+dist] = temp;
         }
     } else {
-        if (inData[i] < inData[i+dist]) {
-            outData[i] = inData[i+dist];
-            outData[i+dist] = temp;
+        if (inData[index] < inData[index+dist]) {
+            outData[index] = inData[index+dist];
+            outData[index+dist] = temp;
         }
     }