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From: "hubicka at ucw dot cz" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/98172] Update -mtune=generic for the current Intel and
 AMD processors
Date: Mon, 07 Dec 2020 14:08:38 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98172

--- Comment #4 from Jan Hubicka <hubicka at ucw dot cz> ---
> > What kind of updates you propose?
>=20
> For one thing, memcpy/memset should be expanded to REP MOVSB/STOSB, never
> MOVSL/MOVSQ.

For core cost tables we use:

/* core_cost should produce code tuned for Core familly of CPUs.  */=20=20=
=20=20=20=20=20=20=20=20=20=20
static stringop_algs core_memcpy[2] =3D {=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20
  {libcall, {{1024, rep_prefix_4_byte, true}, {-1, libcall, false}}},=20=20=
=20=20=20=20=20=20=20=20=20
  {libcall, {{24, loop, true}, {128, rep_prefix_8_byte, true},=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20
             {-1, libcall, false}}}};=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20
static stringop_algs core_memset[2] =3D {=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20
  {libcall, {{6, loop_1_byte, true},=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20
             {24, loop, true},=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20
             {8192, rep_prefix_4_byte, true},=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
             {-1, libcall, false}}},=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20
  {libcall, {{24, loop, true}, {512, rep_prefix_8_byte, true},=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20
             {-1, libcall, false}}}};=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20

So we use mosl/modsw for blocks up to 8k in some cases.
What is output of contrib/bench-stringop on later cores?

Honza
>=20
> --=20
> You are receiving this mail because:
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