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From: "jakub at gcc dot gnu.org" <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 12:49:00 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98856

--- Comment #30 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #29)
> I suppose the reason is that there's two unrelated insns between the
> xmm0 =3D cx:DI and the vec_concat.  Which would hint that we somehow
> need to not match this GPR->XMM move in the peephole pattern but
> instead somehow in the condition (can we use DF there?)

peephole2 are run in a pass that does:
  df_set_flags (DF_LR_RUN_DCE);
  df_note_add_problem ();
  df_analyze ();
so, DF that uses the note or default problems is ok, but e.g.
DF_UD_CHAIN/DF_DU_CHAIN is not available.
But it can e.g. walk some number of previous instructions (with some reason=
ably
small upper bound) etc.=