[Bug tree-optimization/128267] [15/16/17 Regression] wrong code at -O2 with -march=x86-64-v4: a signed char shift induction is 64 again instead of 0 after 256 iterations

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=128267

--- Comment #1 from Drea Pinski <pinskia at gcc dot gnu.org> ---
Created attachment 66029
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=66029&action=edit
Another testcase