[Bug middle-end/117243] program crash under -O3 optimization or higher

[bouncy12578 at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117243

--- Comment #6 from Ye Xiong <bouncy12578 at gmail dot com> ---
(In reply to Sam James from comment #1)
> Trunk works.

When param b is unsigned, trunk will crash.