[Bug tree-optimization/126471] Wrong parity folding with non-even precision

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126471

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 65163
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=65163&action=edit
gcc17-pr126471.patch

Untested fix.