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From: Thomas Monjalon <>
To: Konstantin Ananyev <>
Subject: Re: [dpdk-stable] [dpdk-dev] [PATCH v2] acl: fix build with gcc 11
Date: Wed, 05 May 2021 12:13:00 +0200	[thread overview]
Message-ID: <37680552.IiN9YLNMxG@thomas> (raw)
In-Reply-To: <>

26/04/2021 15:35, Konstantin Ananyev:
> gcc 11 with '-O2' complains about some variables being used without
> being initialized:
> In file included from ../lib/librte_acl/acl_run_avx512x8.h:201,
>                  from ../lib/librte_acl/acl_run_avx512.c:110:
> In function ‘start_flow_avx512x8’,
>     inlined from ‘search_trie_avx512x8.constprop’ at ../lib/librte_acl/acl_run_avx512_common.h:317:2:
> ../lib/librte_acl/acl_run_avx512_common.h:210:13: warning: ‘pdata’ is used uninitialized [-Wuninitialized]
> In file included from ../lib/librte_acl/acl_run_avx512x8.h:201,
>                  from ../lib/librte_acl/acl_run_avx512.c:110:
> ../lib/librte_acl/acl_run_avx512_common.h: In function ‘search_trie_avx512x8.constprop’:
> ../lib/librte_acl/acl_run_avx512_common.h:314:32: note: ‘pdata’ declared here
> In file included from ../lib/librte_acl/acl_run_avx512x8.h:201,
>                  from ../lib/librte_acl/acl_run_avx512.c:110:
> ....
> Indeed, these variables are not explicitly initialized,
> but this is done intentionally.
> We rely on constant mask value that we pass to start_flow*() functions
> as a parameter to mask out uninitialized values.
> Note that '-O3' doesn't produce this warning.
> Anyway, to support clean build with gcc-11 this patch adds
> explicit initialization for these variables.
> I checked the output binary: with '-O3' both clang and gcc 10/11
> generate no extra code for it.
> Also performance test didn't reveal any regressions.
> Bugzilla ID: 673
> Fixes: b64c2295f7fc ("acl: add 256-bit AVX512 classify method")
> Fixes: 45da22e42ec3 ("acl: add 512-bit AVX512 classify method")
> Cc:
> Reported-by: Ali Alnubani <>
> Signed-off-by: Konstantin Ananyev <>

Applied, thanks

      parent reply	other threads:[~2021-05-05 10:13 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-23 13:54 [dpdk-stable] [PATCH] " Konstantin Ananyev
2021-04-26 13:35 ` [dpdk-stable] [PATCH v2] " Konstantin Ananyev
2021-04-26 15:24   ` [dpdk-stable] [dpdk-dev] " Ali Alnubani
2021-04-26 15:30     ` Kevin Traynor
2021-04-26 15:43       ` Ali Alnubani
2021-05-05 10:13   ` Thomas Monjalon [this message]

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