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Fri, 21 May 2021 11:10:41 -0400 (EDT)
From: Thomas Monjalon <thomas@monjalon.net>
To: liangma@liangbit.com, Konstantin Ananyev <konstantin.ananyev@intel.com>
Cc: dev@dpdk.org, stable@dpdk.org
Date: Fri, 21 May 2021 17:10:41 +0200
Message-ID: <5942248.XgMt1RgFVE@thomas>
In-Reply-To: <20210521144207.13802-1-konstantin.ananyev@intel.com>
References: <20210521144207.13802-1-konstantin.ananyev@intel.com>
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Subject: Re: [dpdk-stable] [dpdk-dev] [PATCH] acl: fix build with GCC 6.3
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21/05/2021 16:42, Konstantin Ananyev:
> --buildtype=3Ddebug with gcc 6.3 produces the following error:
>=20
> ../lib/librte_acl/acl_run_avx512_common.h: In function
> =E2=80=98resolve_match_idx_avx512x16=E2=80=99:
> ../lib/librte_acl/acl_run_avx512x16.h:33:18: error:
> the last argument must be an 8-bit immediate
> ^
> ../lib/librte_acl/acl_run_avx512_common.h:373:9: note:
> in expansion of macro =E2=80=98_M_I_=E2=80=99
> return _M_I_(slli_epi32)(mi, match_log);
> ^~~~~
>=20
> Seems like gcc-6.3 complains about the following construct:
>=20
> static const uint32_t match_log =3D 5;
> ...
> _mm512_slli_epi32(mi, match_log);
>=20
> It can't substitute constant variable 'match_log' with its actual value.
> The fix replaces constant variable with its immediate value.
>=20
> Bugzilla ID: 717
> Fixes: b64c2295f7fc ("acl: add 256-bit AVX512 classify method")
> Fixes: 45da22e42ec3 ("acl: add 512-bit AVX512 classify method")
> Cc: stable@dpdk.org
>=20
> Reported-by: Liang Ma <liangma@liangbit.com>
> Signed-off-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
How much critical is it?
It looks safer to wait for 21.08 cycle?