--- a/example/bitonic_sort/ppe/swap.cc	Fri Feb 06 06:21:57 2015 +0900
+++ b/example/bitonic_sort/ppe/swap.cc	Sat Feb 07 02:34:46 2015 +0900
@@ -7,22 +7,19 @@
 {
     int* inData = (int*)s->get_input(rbuf, 0);
     int* outData = (int*)s->get_output(wbuf, 0);
-    long i = (long)s->get_param(0);
-    long j = (long)s->get_param(1);
-    int k = s->x;
-
-    int point = j^k;
-    int temp = inData[k];
+    long block = (long)s->get_param(0);
+    bool first = (bool)s->get_param(1);
+    int x = s->x;
+    
+    int position = x/block;
+    int index = x+block*position;
 
-    if (k < point) {
-        if ((i&k)==0 && inData[point] < inData[k]) {
-            outData[k] = inData[point];
-            outData[point] = temp;
-        }
-        if ((i&k)!=0 && inData[k] < inData[point]) {
-            outData[k] = inData[point];
-            outData[point] = temp;
-        }
+    block = first ? ((block<<1)*(position+1))-(index%block)-1 : index+block;
+    
+    if (inData[block] < inData[index]) {
+        int tmp = inData[index];
+        outData[index] = inData[block];
+        outData[block] = tmp;
     }
     
     return 0;