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diff --git a/cas_test.c b/cas_test.c
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+/*
+ * File     : atomic.c
+ * Author   : Jérémy Zurcher  <jeremy@asynk.ch>
+ * Date     : 01/11/09 
+ * License  :
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining
+ *  a copy of this software and associated documentation files (the
+ *  "Software"), to deal in the Software without restriction, including
+ *  without limitation the rights to use, copy, modify, merge, publish,
+ *  distribute, sublicense, and/or sell copies of the Software, and to
+ *  permit persons to whom the Software is furnished to do so, subject to
+ *  the following conditions:
+ *  
+ *  The above copyright notice and this permission notice shall be
+ *  included in all copies or substantial portions of the Software.
+ *  
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#include <stdio.h>
+#include "cas.h"
+
+#define MAKE_LONG_LONG(lo, hi)		((hi)<<32)+(lo)
+
+typedef union pointer {
+    struct {
+        volatile void *ptr;
+        volatile unsigned int count;
+    } split;
+    volatile unsigned long long concat;
+} pointer_t;
+
+int main( int argc, char*argv[], char*env[] ) {
+    int ret;
+
+    pointer_t mem, old, new;
+    
+    mem.split.count = 0;
+    old.split.count = 6;
+    new.split.count = 666;
+    mem.split.ptr = (void*)&argc;
+    old.split.ptr = (void*)&argc;
+    new.split.ptr = (void*)&argv;
+
+    ret = compare_and_swap(&mem.concat, old.concat, new.concat);
+    printf("ret %d -> (%d,%X)\n", ret, mem.split.count, (unsigned int)mem.split.ptr);
+
+    mem.split.count=6;
+    ret = compare_and_swap(&mem.concat, old.concat, new.concat);
+    printf("ret %d -> (%d,%X)\n", ret, mem.split.count, (unsigned int)mem.split.ptr);
+
+    return 0;
+}
+