tree 5778386461e2372aaac331c76dfe8a67f44dfa19
parent bf17375e5e6195122ee24295cf05f012822711ec
author Charles Tsai <charles_tsai@htc.com> 1432117008 +0800
committer Charles Tsai <charles_tsai@htc.com> 1433409243 +0800

Fix overflow/underflow problem in comparison

Here's overflow/underflow problem in comparators.
"when1 - when2" may suffer in overflow/underflow condition.
Comparing them directly can avoid this problem.

Change-Id: Id46af3db2adac90654210182d26ade1986ee0661