[Bug tree-optimization/46675] [4.6 Regression] profiledbootstrap failed

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46675

--- Comment #23 from H.J. Lu <hjl.tools at gmail dot com> 2010-11-28 18:56:51 
UTC ---
We check "op + 2147483648" for overflow. I don't think we properly
check "op - -2147483648" for overflow.