--- a/src/share/vm/utilities/copy.hpp	Wed Jun 09 18:50:45 2010 -0700
+++ b/src/share/vm/utilities/copy.hpp	Thu Jun 10 13:04:20 2010 -0700
@@ -73,6 +73,9 @@
   // whole alignment units.  E.g., if BytesPerLong is 2x word alignment, an odd
   // count may copy an extra word.  In the arrayof case, we are allowed to copy
   // only the number of copy units specified.
+  //
+  // All callees check count for 0.
+  //
 
   // HeapWords
 
@@ -99,7 +102,6 @@
   // Object-aligned words,  conjoint, not atomic on each word
   static void aligned_conjoint_words(HeapWord* from, HeapWord* to, size_t count) {
     assert_params_aligned(from, to);
-    assert_non_zero(count);
     pd_aligned_conjoint_words(from, to, count);
   }
 
@@ -107,49 +109,42 @@
   static void aligned_disjoint_words(HeapWord* from, HeapWord* to, size_t count) {
     assert_params_aligned(from, to);
     assert_disjoint(from, to, count);
-    assert_non_zero(count);
     pd_aligned_disjoint_words(from, to, count);
   }
 
   // bytes, jshorts, jints, jlongs, oops
 
   // bytes,                 conjoint, not atomic on each byte (not that it matters)
-  static void conjoint_bytes(void* from, void* to, size_t count) {
-    assert_non_zero(count);
+  static void conjoint_jbytes(void* from, void* to, size_t count) {
     pd_conjoint_bytes(from, to, count);
   }
 
   // bytes,                 conjoint, atomic on each byte (not that it matters)
-  static void conjoint_bytes_atomic(void* from, void* to, size_t count) {
-    assert_non_zero(count);
+  static void conjoint_jbytes_atomic(void* from, void* to, size_t count) {
     pd_conjoint_bytes(from, to, count);
   }
 
   // jshorts,               conjoint, atomic on each jshort
   static void conjoint_jshorts_atomic(jshort* from, jshort* to, size_t count) {
     assert_params_ok(from, to, LogBytesPerShort);
-    assert_non_zero(count);
     pd_conjoint_jshorts_atomic(from, to, count);
   }
 
   // jints,                 conjoint, atomic on each jint
   static void conjoint_jints_atomic(jint* from, jint* to, size_t count) {
     assert_params_ok(from, to, LogBytesPerInt);
-    assert_non_zero(count);
     pd_conjoint_jints_atomic(from, to, count);
   }
 
   // jlongs,                conjoint, atomic on each jlong
   static void conjoint_jlongs_atomic(jlong* from, jlong* to, size_t count) {
     assert_params_ok(from, to, LogBytesPerLong);
-    assert_non_zero(count);
     pd_conjoint_jlongs_atomic(from, to, count);
   }
 
   // oops,                  conjoint, atomic on each oop
   static void conjoint_oops_atomic(oop* from, oop* to, size_t count) {
     assert_params_ok(from, to, LogBytesPerHeapOop);
-    assert_non_zero(count);
     pd_conjoint_oops_atomic(from, to, count);
   }
 
@@ -157,7 +152,6 @@
   static void conjoint_oops_atomic(narrowOop* from, narrowOop* to, size_t count) {
     assert(sizeof(narrowOop) == sizeof(jint), "this cast is wrong");
     assert_params_ok(from, to, LogBytesPerInt);
-    assert_non_zero(count);
     pd_conjoint_jints_atomic((jint*)from, (jint*)to, count);
   }
 
@@ -168,36 +162,31 @@
   static void conjoint_memory_atomic(void* from, void* to, size_t size);
 
   // bytes,                 conjoint array, atomic on each byte (not that it matters)
-  static void arrayof_conjoint_bytes(HeapWord* from, HeapWord* to, size_t count) {
-    assert_non_zero(count);
+  static void arrayof_conjoint_jbytes(HeapWord* from, HeapWord* to, size_t count) {
     pd_arrayof_conjoint_bytes(from, to, count);
   }
 
   // jshorts,               conjoint array, atomic on each jshort
   static void arrayof_conjoint_jshorts(HeapWord* from, HeapWord* to, size_t count) {
     assert_params_ok(from, to, LogBytesPerShort);
-    assert_non_zero(count);
     pd_arrayof_conjoint_jshorts(from, to, count);
   }
 
   // jints,                 conjoint array, atomic on each jint
   static void arrayof_conjoint_jints(HeapWord* from, HeapWord* to, size_t count) {
     assert_params_ok(from, to, LogBytesPerInt);
-    assert_non_zero(count);
     pd_arrayof_conjoint_jints(from, to, count);
   }
 
   // jlongs,                conjoint array, atomic on each jlong
   static void arrayof_conjoint_jlongs(HeapWord* from, HeapWord* to, size_t count) {
     assert_params_ok(from, to, LogBytesPerLong);
-    assert_non_zero(count);
     pd_arrayof_conjoint_jlongs(from, to, count);
   }
 
   // oops,                  conjoint array, atomic on each oop
   static void arrayof_conjoint_oops(HeapWord* from, HeapWord* to, size_t count) {
     assert_params_ok(from, to, LogBytesPerHeapOop);
-    assert_non_zero(count);
     pd_arrayof_conjoint_oops(from, to, count);
   }
 
@@ -319,14 +308,6 @@
 #endif
   }
 
-  static void assert_non_zero(size_t count) {
-#ifdef ASSERT
-    if (count == 0) {
-      basic_fatal("count must be non-zero");
-    }
-#endif
-  }
-
   static void assert_byte_count_ok(size_t byte_count, size_t unit_size) {
 #ifdef ASSERT
     if ((size_t)round_to(byte_count, unit_size) != byte_count) {