[dpdk-dev] [PATCH v2] net/i40e: fix avx code error on MinGW

Ferruh Yigit ferruh.yigit at intel.com
Thu Feb 4 13:36:05 CET 2021

On 2/4/2021 10:41 AM, Zhang, Qi Z wrote:
>> -----Original Message-----
>> From: Dmitry Kozlyuk <dmitry.kozliuk at gmail.com>
>> Sent: Wednesday, February 3, 2021 7:08 AM
>> To: Rong, Leyi <leyi.rong at intel.com>
>> Cc: david.marchand at redhat.com; Zhang, Qi Z <qi.z.zhang at intel.com>; Yigit,
>> Ferruh <ferruh.yigit at intel.com>; thomas at monjalon.net; Richardson, Bruce
>> <bruce.richardson at intel.com>; talshn at nvidia.com; Kadam, Pallavi
>> <pallavi.kadam at intel.com>; Menon, Ranjit <ranjit.menon at intel.com>; Xing,
>> Beilei <beilei.xing at intel.com>; aconole at redhat.com; dev at dpdk.org;
>> ci at dpdk.org
>> Subject: Re: [dpdk-dev] [PATCH v2] net/i40e: fix avx code error on MinGW
>> On Tue,  2 Feb 2021 22:32:58 +0800, Leyi Rong wrote:
>>> Adds extra cflags '-fno-asynchronous-unwind-tables'
>>> to avoid the MinGW build error:
>>> 	Error: invalid register for .seh_savexmm
>>> Fixes: 5c38c33f7880 ("net/i40e: disable AVX512 with MinGW")
>>> Signed-off-by: Leyi Rong <leyi.rong at intel.com>
>> Tested-by: Dmitry Kozlyuk <dmitry.kozliuk at gmail.com>
>> Re: -fno-asynchronous-unwind-tables, when cross-compiling from Linux, I
>> observe bit-to-bit identical i40e_rxtx_vec_avx512.c.obj. My guess it that this
>> option somehow affects GCC inlining heuristics. Similar issue existed in
>> librte_acl (at least a year ago win GCC 6, I believe), where GCC generated
>> incorrect code unless certain functions had been inlined (caught by test app).
>> No an AVX expert, just my 2c.
> Applied to dpdk-next-net-intel.

Hi Thomas, David,

Do you prefer to get this directly to the main repo, since it is fixing the 
windows build?

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