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From: Liang Ma <liangma@liangbit.com>
To: Thomas Monjalon <thomas@monjalon.net>
Cc: Konstantin Ananyev <konstantin.ananyev@intel.com>,
	dev@dpdk.org, stable@dpdk.org
Subject: Re: [dpdk-dev] [PATCH] acl: fix build with GCC 6.3
Date: Fri, 21 May 2021 16:21:31 +0100	[thread overview]
Message-ID: <YKfP+3MnwZt+efM0@C02F33EJML85> (raw)
In-Reply-To: <5942248.XgMt1RgFVE@thomas>

On Fri, May 21, 2021 at 05:10:41PM +0200, Thomas Monjalon wrote:
> 21/05/2021 16:42, Konstantin Ananyev:
> > --buildtype=debug with gcc 6.3 produces the following error:
> > 
> > ../lib/librte_acl/acl_run_avx512_common.h: In function
> > ‘resolve_match_idx_avx512x16’:
> > ../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 ‘_M_I_’
> >       return _M_I_(slli_epi32)(mi, match_log);
> >              ^~~~~
> > 
> > Seems like gcc-6.3 complains about the following construct:
> > 
> > static const uint32_t match_log = 5;
> >     ...
> > _mm512_slli_epi32(mi, match_log);
> > 
> > It can't substitute constant variable 'match_log' with its actual value.
> > The fix replaces constant variable with its immediate value.
> > 
> > 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
> > 
> > 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?
+1. gcc8.30 is OK. It's a bit late now. 
> 
> 


  parent reply	other threads:[~2021-05-21 15:21 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-21 14:42 Konstantin Ananyev
2021-05-21 14:55 ` Liang Ma
2021-05-21 15:10 ` Thomas Monjalon
2021-05-21 15:16   ` Ananyev, Konstantin
2021-05-21 15:21   ` Liang Ma [this message]
2021-06-17  6:57 ` Thomas Monjalon

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