[Bug tree-optimization/123656] [16 Regression] wrong code with unsigned char [2] vector multiplication by 210 since r16-5095

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123656

--- Comment #5 from Avinash Jayakar <avinashd at gcc dot gnu.org> ---
There was a problem in the alg_sub_factor case, the operands were swapped. For
alg_sub_t_m2, the order is correct.