[Bug tree-optimization/63302] [4.9 Regression] Code with 64-bit long long constants is miscompiled on 32-bit host

[zhenqiang.chen at arm dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63302

--- Comment #14 from Zhenqiang Chen <zhenqiang.chen at arm dot com> ---
Created attachment 33608
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33608&action=edit
patch

After investigation, I found I mis-use tree_log2.

Please try the attached patch. If it works, I will run all tests and send it
for community review.

Thanks!