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From: "rguenth 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: Thu, 28 Jan 2021 09:40:16 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98856

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Slow:

Samples: 4K of event 'cycles:u', Event count (approx.): 4565667242=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20
Overhead       Samples  Command  Shared Object     Symbol=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
  30.88%          1252  botan    libbotan-2.so.17  [.]
Botan::Block_Cipher_Fixed_Params<16ul, 16ul, 0ul, 1ul, Botan
  30.24%          1235  botan    libbotan-2.so.17  [.]
Botan::Block_Cipher_Fixed_Params<16ul, 16ul, 0ul, 1ul, Botan
  26.04%          1055  botan    libbotan-2.so.17  [.] Botan::poly_double_n=
_le

Fast

Samples: 4K of event 'cycles:u', Event count (approx.): 4427277434=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20
Overhead       Samples  Command  Shared Object        Symbol=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
  33.59%          1372  botan    libbotan-2.so.17     [.]
Botan::Block_Cipher_Fixed_Params<16ul, 16ul, 0ul, 1ul, Bo
  33.16%          1356  botan    libbotan-2.so.17     [.]
Botan::Block_Cipher_Fixed_Params<16ul, 16ul, 0ul, 1ul, Bo
  18.71%           765  botan    libbotan-2.so.17     [.]
Botan::poly_double_n_le

also fast on trunk when not vectorizing, so the rev does what it was intend=
ed
to
(more vectorization).  I'll look into what we do to poly_double_n_le.=