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Re: [Qemu-devel] [v3 3/3] configure: add options to config avx2
From: |
Li, Liang Z |
Subject: |
Re: [Qemu-devel] [v3 3/3] configure: add options to config avx2 |
Date: |
Tue, 8 Dec 2015 14:18:47 +0000 |
> On 8 December 2015 at 12:08, Liang Li <address@hidden> wrote:
> > Add the '--enable-avx2' & '--disable-avx2' option so as to config the
> > AVX2 instruction optimization.
> >
> > If '--disable-avx2' is not set, configure will detect if the compiler
> > can support AVX2 option, if yes, AVX2 optimization is eabled, else
> > disabled.
>
> Is the configure option necessary? For other things like this (eg our use of
> SSE2 or Altivec) we just go ahead and use the feature if the compiler
> supports it.
>
It seems unnecessary.
> When would somebody building QEMU want to disable this option?
>
> thanks
> -- PMM
The v1 of this patch had the '--enable-avx2' & '--disable-avx2' options
because this version did not
support ifunc, and I left them here in the following version ...
I will remove them if they are unnecessary.
Thanks for your comments.
Liang
- Re: [Qemu-devel] [v3 1/3] cutils: add avx2 instruction optimization, (continued)
- Re: [Qemu-devel] [v3 1/3] cutils: add avx2 instruction optimization, Richard Henderson, 2015/12/08
- Re: [Qemu-devel] [v3 1/3] cutils: add avx2 instruction optimization, Li, Liang Z, 2015/12/09
- Re: [Qemu-devel] [v3 1/3] cutils: add avx2 instruction optimization, Richard Henderson, 2015/12/09
- Re: [Qemu-devel] [v3 1/3] cutils: add avx2 instruction optimization, Li, Liang Z, 2015/12/09
- Re: [Qemu-devel] [v3 1/3] cutils: add avx2 instruction optimization, Paolo Bonzini, 2015/12/10
- Re: [Qemu-devel] [v3 1/3] cutils: add avx2 instruction optimization, Li, Liang Z, 2015/12/10
- Re: [Qemu-devel] [v3 1/3] cutils: add avx2 instruction optimization, Paolo Bonzini, 2015/12/10
[Qemu-devel] [v3 2/3] configure: detect ifunc attribute, Liang Li, 2015/12/08
[Qemu-devel] [v3 3/3] configure: add options to config avx2, Liang Li, 2015/12/08