Re: [dpdk-dev] [PATCH] net/i40e: disable AVX512 with MinGW

[Tal Shnaiderman <talshn@nvidia.com>]

> Subject: Re: [PATCH] net/i40e: disable AVX512 with MinGW
> 
> External email: Use caution opening links or attachments
> 
> 
> On Tue, Feb 02, 2021 at 05:06:39PM +0800, Leyi Rong wrote:
> > Disable i40e AVX512 code path for Windows build regardless of CPU
> > capability to avoid the MinGW build error:
> >       Error: invalid register for .seh_savexmm
> >
> > Signed-off-by: Leyi Rong <leyi.rong@intel.com>
> > ---
> >  drivers/net/i40e/meson.build | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/net/i40e/meson.build
> > b/drivers/net/i40e/meson.build index f5fc5a17e..26cd201ee 100644
> > --- a/drivers/net/i40e/meson.build
> > +++ b/drivers/net/i40e/meson.build
> > @@ -56,6 +56,7 @@ if arch_subdir == 'x86'
> >
> >       if is_windows and cc.get_id() != 'clang'
> >               i40e_avx512_cc_support = false
> > +             i40e_avx512_cpu_support = false
> >       endif
> >
> 
> This fix seems to imply that there is something else wrong in the logic in the
> build file. If the compiler does not support avx512, the fact that the CPU
> supports it should be completely irrelevant. Therefore, I think a more correct
> fix (logically) should be to remove the "i40e_avx512_cpu_support"
> from the next "if" condition, and only check the compiler support. We don't
> do anything with the cpu support variable.

Moreover, this patch doesn't resolve the issue [1].

 [1]  http://mails.dpdk.org/archives/test-report/2021-February/177665.html

> 
> /Bruce