Using the Sun C++ option -xport64=implicit for the JVM 64bits build gives a lot
warnings:
"Warning: Converting a 64-bit type value to "int" causes truncation."
% fgrep "Warning: Converting a 64-bit" compLP64_implicit_sort.out |uniq|wc
     980 13279 154850

We have to cleanup them to avoid bugs like JDK-4965430.

This problem occures in all parts of Hotspot. I will start with compiler2.

I looked on all cases for compiler2 and didn't find any bug-like problems.
Will cleanup in the next release.

Vladimir