[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 #6 from Zhenqiang Chen <zhenqiang.chen at arm dot com> ---
I double checked the function optimize_range_tests_diff. Overall, I think it
does the right thing. X86 and ARM work correctly. The ldil.c.169t.optimized is

  <bb 2>:
  x_2 = ival_1(D) & -2147481601;
  _8 = x_2 + 2147483648;
  _9 = _8 & -2147483649;
  _10 = _9 == 0;
  _6 = (int) _10;
  return _6;

If we can not fix the wide-int issue, I will create a patch to workaround it
for 4.9 since I never expected optimize_range_tests_diff can work between a
positive value and a negative value.