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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/101696] Function multiversioning not usable with new
 x86-64-v*
Date: Wed, 11 Aug 2021 12:10:59 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101696

Martin Li=C5=A1ka <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |NEW
                 CC|                            |hjl.tools at gmail dot com
           Assignee|marxin at gcc dot gnu.org          |unassigned at gcc d=
ot gnu.org

--- Comment #5 from Martin Li=C5=A1ka <marxin at gcc dot gnu.org> ---
Right now, the x86-64* are defined as aliases to k8:

  {"x86-64", PROCESSOR_K8, CPU_K8, PTA_X86_64_BASELINE, 0, P_NONE},
  {"x86-64-v2", PROCESSOR_K8, CPU_GENERIC, PTA_X86_64_V2 | PTA_NO_TUNE,
   0, P_NONE},
  {"x86-64-v3", PROCESSOR_K8, CPU_GENERIC, PTA_X86_64_V3 | PTA_NO_TUNE,
   0, P_NONE},
  {"x86-64-v4", PROCESSOR_K8, CPU_GENERIC, PTA_X86_64_V4 | PTA_NO_TUNE,
   0, P_NONE},

and it has the corresponding pta info:

(gdb) p *arch_info
$10 =3D {
  name =3D 0x1f96cdc "x86-64",
  processor =3D PROCESSOR_K8,
  schedule =3D CPU_K8,
  flags =3D {
    low =3D 0,
    high =3D 137445326852
  },
  model =3D 0,
  priority =3D P_NONE
}

thus we end up with:
pr101696.c:16:5: error: no dispatcher found for the versioning attributes
   16 | int foo ()
      |     ^~~

So first step that needs to be done is adding support for the march names i=
n:
__builtin_cpu_is.
@H.J. Can you please add that?=