[Bug target/94460] wrong code with __builtin_ia32_phsubw256() or __builtin_ia32_phsubd256()

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94460

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 48178
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48178&action=edit
gcc10-pr94460-2.patch

Although, the patterns look unnecessarily large and complicated to me, so for
GCC11? I think we should go with this incremental patch to simplify them.