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From: "crazylht at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/98348] [10 Regression] GCC 10.2 AVX512 Mask regression
 from GCC 9
Date: Fri, 07 May 2021 02:25:06 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98348

--- Comment #22 from Hongtao.liu <crazylht at gmail dot com> ---
(In reply to D=C3=A1vid Bolvansk=C3=BD from comment #20)
> Some small regression (missed opportunity to use vptestnmd):
>=20
> Current trunk
>=20
> compare(unsigned int __vector(16)):
>   vpxor xmm1, xmm1, xmm1
>   vpcmpd k0, zmm0, zmm1, 0
>   vpmovm2d zmm0, k0
>   ret
>=20
> GCC 9.2
>=20
> compare(unsigned int __vector(16)):
>   vptestnmd k0, zmm0, zmm0
>   vpmovm2d zmm0, k0
>   ret
>=20
>=20
> https://gcc.godbolt.org/z/5vK68jM3r

A patch is posed at
https://gcc.gnu.org/pipermail/gcc-patches/2021-April/568210.html=