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From: "linkw at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug testsuite/106516] New test case gcc.dg/pr104992.c fails on
 power 10
Date: Thu, 04 Aug 2022 06:24:50 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106516

Kewen Lin <linkw at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
                 CC|                            |linkw at gcc dot gnu.org
   Last reconfirmed|                            |2022-08-04
             Status|UNCONFIRMED                 |NEW

--- Comment #2 from Kewen Lin <linkw at gcc dot gnu.org> ---
Confirmed, this is a test issue, power10 and up specific.

The difference comes from the function thud, it aims to test the pattern wo=
rks
for vector type. Power10 starts to support the insn vmodsw for vector integ=
er
mod.

So it gets:

  vector(4) int thud (vector(4) int x, vector(4) int y)

    _1 =3D x_3(D) % y_4(D);
    _2 =3D _1 =3D=3D { 0, 0, 0, 0 };

instead of=20

    <bb 2> [local count: 1073741824]:
    _7 =3D BIT_FIELD_REF <x_3(D), 32, 0>;
    _8 =3D BIT_FIELD_REF <y_4(D), 32, 0>;
    _9 =3D _7 % _8;
    _10 =3D BIT_FIELD_REF <x_3(D), 32, 32>;
    _11 =3D BIT_FIELD_REF <y_4(D), 32, 32>;
    _12 =3D _10 % _11;
    _13 =3D BIT_FIELD_REF <x_3(D), 32, 64>;
    _14 =3D BIT_FIELD_REF <y_4(D), 32, 64>;
    _15 =3D _13 % _14;
    _16 =3D BIT_FIELD_REF <x_3(D), 32, 96>;
    _17 =3D BIT_FIELD_REF <y_4(D), 32, 96>;
    _18 =3D _16 % _17;
    _1 =3D {_9, _12, _15, _18};
    _2 =3D _1 =3D=3D { 0, 0, 0, 0 };

We can adjust the test case to expect 6 times "%" on target power10_ok
specially, but I wonder if we also find this fail on some other targets whi=
ch
supports vector mod, if so, one overall complete guard would be better.=