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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 12:52:00 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98856

--- Comment #31 from Uro=C5=A1 Bizjak <ubizjak at gmail dot com> ---
(In reply to Richard Biener from comment #29)
> The simplified variant below works but IMHO matches cases we do not
> want to transform.  I can't find any example on how to achieve that
> though.

I think that pinsrd should be transformed to punpcklqdq irrespective of its
first input operand. The insn scheduler should move insns around to mask th=
eir
latencies.

> ;; Further split pinsrq variants of vec_concatv2di with two GPR sources,
> ;; one already reloaded, to hide the latency of one GPR->XMM transitions.
> (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")))]
>   "reload_completed && optimize_insn_for_speed_p ()"

Please use

  "TARGET_64BIT && TARGET_SSE4_1
   && !optimize_insn_for_size_p ()"

here.

>   [(set (match_dup 3)
>         (match_dup 2))
>    (set (match_dup 0)
>         (vec_concat:V2DI (match_dup 1)
>                          (match_dup 3)))])=