[Bug tree-optimization/106322] [12 Regression] tree-vectorize: Wrong code at O2 level (-fno-tree-vectorize is working) since r12-2404-ga1d27560770818c5

[linkw at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106322

--- Comment #49 from Kewen Lin <linkw at gcc dot gnu.org> ---
Hi Richi,

One thing I'm not sure about is that if we want to backport this to gcc-11 and
gcc-10? Although the failure got exposed by .MULH pattern recog which is only
in gcc-12, IMHO the underlying issue exists in gcc-10 and gcc-11.