[Bug target/126328] x86 costing rejects forming of *sse3_haddv2df3_low from vec_select of sse3_haddv2df

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126328

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Hongtao Liu from comment #1)
> We can have special handling for get_attr_type (insn) == sseadd1(only
> *sse3_haddv2df3_low and *sse3_hsubv2df3_low) in ix86_insn_cost, directly
> return insn cost instead of lowering to rtx_cost.

Ah yes, that way we can up the original cost (hopefully always recog'ed).  I'll
give it a try.