[Bug c/64255] failures with -O2 optimization on i >= 0 ? (unsigned long) i : - (unsigned long) i

[vincent-gcc at vinc17 dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64255

--- Comment #3 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> ---
Created attachment 34243
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34243&action=edit
testcase part 2 (tst2.c)