src/share/vm/runtime/arguments.cpp

*** 1657,1666 ****
--- 1657,1670 ----
    assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
    MinObjAlignmentInBytes     = ObjectAlignmentInBytes;
    assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
    MinObjAlignment            = MinObjAlignmentInBytes / HeapWordSize;
    assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
+ 
+   assert (is_power_of_2(MinObjAlignment), "extra sanity");
+   assert (is_power_of_2(MinObjAlignmentInBytes), "extra sanity");
+   MinObjAlignmentMask        = MinObjAlignment - 1;
    MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
  
    LogMinObjAlignmentInBytes  = exact_log2(ObjectAlignmentInBytes);
    LogMinObjAlignment         = LogMinObjAlignmentInBytes - LogHeapWordSize;