*** old/src/hotspot/share/opto/mathexactnode.cpp	Wed Jan 10 15:09:10 2018
--- new/src/hotspot/share/opto/mathexactnode.cpp	Wed Jan 10 15:09:10 2018

*** 116,126 ****
--- 116,129 ----
  bool OverflowSubLNode::will_overflow(jlong v1, jlong v2) const {
    return SubHelper<OverflowSubLNode>::will_overflow(v1, v2);
  }
  
  bool OverflowMulLNode::will_overflow(jlong val1, jlong val2) const {
!     jlong result = val1 * val2;
!     julong v1 = (julong) val1;
+     julong v2 = (julong) val2;
+     julong tmp = v1 * v2;
+     jlong result = (jlong) tmp;
      jlong ax = (val1 < 0 ? -val1 : val1);
      jlong ay = (val2 < 0 ? -val2 : val2);
  
      bool overflow = false;
      if ((ax | ay) & CONST64(0xFFFFFFFF00000000)) {