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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/98856] [11 Regression] botan AES-128/XTS is
 slower by ~17% since r11-6649-g285fa338b06b804e72997c4d876ecf08a9c083af
Date: Fri, 05 Mar 2021 12:25:03 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98856

--- Comment #28 from Uro=C5=A1 Bizjak <ubizjak at gmail dot com> ---
(In reply to Uro=C5=A1 Bizjak from comment #27)
> (In reply to Richard Biener from comment #26)
> > but that doesn't seem to match for some unknown reason.=20
> Try this:

The latency problem with the original testcase is solved with:

(define_peephole2
  [(match_scratch:DI 3 "Yv")
   (set (match_operand:V2DI 0 "sse_reg_operand")
        (vec_concat:V2DI (match_operand:DI 1 "sse_reg_operand")
                         (match_operand:DI 2 "nonimmediate_gr_operand")))]
  ""
  [(set (match_dup 3) (match_dup 2))
   (set (match_dup 0)
        (vec_concat:V2DI (match_dup 1) (match_dup 3)))])

but I don't know if this transformation applies universally to all x86 targ=
ets.=