[Bug middle-end/50066] [4.7 Regression] Bad signed int to unsigned long long conversion

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50066

--- Comment #14 from H.J. Lu <hjl.tools at gmail dot com> 2011-08-13 18:32:53 UTC ---
What possible optimization do we gain by not checking
range overflow? Does anyone have a testcase to show it?