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Subject: Re: [PATCH] Optimize nested permutation to single VEC_PERM_EXPR
 [PR54346]
From: Xi Ruoyao <xry111@xry111.site>
To: Liwei Xu <liwei.xu@intel.com>, gcc-patches@gcc.gnu.org
Cc: wilson@tuliptree.org, admin@levyhsu.com, Lulu Cheng
 <chenglulu@loongson.cn>
Date: Wed, 12 Oct 2022 21:51:47 +0800
In-Reply-To: <20220926065604.783193-1-liwei.xu@intel.com>
References: <20220926065604.783193-1-liwei.xu@intel.com>
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On Mon, 2022-09-26 at 14:56 +0800, Liwei Xu via Gcc-patches wrote:
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 This patch implemented the opt=
imization in PR 54346, which Merges
>=20
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0c =3D VEC_PERM_EXPR <a, b=
, VCST0>;
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 d =3D VEC_PERM_EXPR <c, c, VCS=
T1>;
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 to
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 d =3D VEC_PERM_EXPR <a, b, NEW=
_VCST>;
>=20
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Bootstrapped and regteste=
d on x86_64-pc-linux-gnu{-m32,}
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 tree-ssa/forwprop-19.c fail to=
 pass but I'm not sure whether it
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 is ok to removed it.

I'm getting:

FAIL: gcc.dg/pr54346.c scan-tree-dump dse1 "VEC_PERM_EXPR.*{ 3, 6, 0, 0 }"
FAIL: gcc.dg/pr54346.c scan-tree-dump-times dse1 "VEC_PERM_EXPR" 1

on loongarch64-linux-gnu.  Not sure why.


--=20
Xi Ruoyao <xry111@xry111.site>
School of Aerospace Science and Technology, Xidian University