[Bug middle-end/127860] expand_vec_perm_const reduces the selector by the result length for a VEC_PERM_EXPR with wider inputs (latent wrong code)

[igor at tachyum dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127860

--- Comment #1 from Igor Shevlyakov <igor at tachyum dot com> ---
Created attachment 65816
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=65816&action=edit
x86-demo-hook.diff