[Bug tree-optimization/113281] [11/12/13 Regression] Latent wrong code due to vectorization of shift reduction and missing promotions since r9-1590

[juzhe.zhong at rivai dot ai via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113281

--- Comment #28 from JuzheZhong <juzhe.zhong at rivai dot ai> ---
The original cost model I did work for all cases but with some middle-end
changes
the cost model failed.

I don't have time to figure out what's going on here.

Robin may be interested at it.