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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/105219] [12 Regression] SVE: Wrong code with
 -O3 -msve-vector-bits=128 -mtune=thunderx
Date: Wed, 27 Apr 2022 11:56:24 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105219

--- Comment #13 from Martin Li=C5=A1ka <marxin at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #11)
> int data[128];
>=20
> void __attribute((noipa))
> foo (int *data, int n)
> {
>   for (int i =3D 0; i < n; ++i)
>     data[i] =3D i;
> }
>=20
> int main()
> {
>   for (int start =3D 0; start < 16; ++start)
>     for (int n =3D 1; n < 3*16; ++n)
>       {
>         __builtin_memset (data, 0, sizeof (data));
>         foo (&data[start], n);
>         for (int j =3D 0; j < n; ++j)
>           if (data[start + j] !=3D j)
>             __builtin_abort ();
>       }
>   return 0;
> }
>=20
> for example aborts with -O3 -mtune=3Dintel -fno-vect-cost-model on x86_64,
> the cost model disabling is necessary to have the epilogue vectorized.
> Without a cost model we peel for the maximum number of aligned refs
> but still use the target cost to decide whether peeling is worth at all.

This one started with r12-1181-g7ed1cd9665d8ca0f.=