From: Paolo Bonzini <pbonzini@redhat.com>
To: Liang Z Li <liang.z.li@intel.com>
Cc: amit shah <amit.shah@redhat.com>,
mst@redhat.com, qemu-devel@nongnu.org, quintela@redhat.com
Subject: Re: [Qemu-devel] [v2 1/2] cutils: add avx2 instruction optimization
Date: Fri, 13 Nov 2015 04:30:53 -0500 (EST) [thread overview]
Message-ID: <1294522305.12149399.1447407053948.JavaMail.zimbra@redhat.com> (raw)
In-Reply-To: <F2CBF3009FA73547804AE4C663CAB28E019A5479@shsmsx102.ccr.corp.intel.com>
> > ... define buffer_find_nonzero_offset_inner ...
> > ... define can_use_buffer_find_nonzero_offset_inner ...
>
> > #if defined CONFIG_HAVE_GNU_IFUNC && defined CONFIG_HAVE_AVX2 ...
> > define buffer_find_nonzero_offset_avx2 ...
> > ... define can_use_buffer_find_nonzero_offset_avx2 ...
> > ... define the indirect functions ...
> > #else
> > ... define buffer_find_nonzero_offset that just calls
> > buffer_find_nonzero_offset_inner ...
> > ... define can_use_buffer_find_nonzero_offset that just calls
> > can_use_buffer_find_nonzero_offset_inner ...
> > #endif
> >
> > Thanks,
> >
> > Paolo
>
> The buffer_find_nonzero_offset_inner & buffer_find_nonzero_offset_avx2
> can't defined in the same .c file.
> Or, if the '-maxv2' is enabled, the " buffer_find_nonzero_offset_inner ()"
> will be compiled to AVX2 instructions.
You can use __attribute__((__target__("avx2"))) on the avx2 version,
instead of compiling the whole file with -mavx2.
Paolo
next prev parent reply other threads:[~2015-11-13 9:31 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-10 2:51 [Qemu-devel] [v2 0/2] add avx2 instruction optimization Liang Li
2015-11-10 2:51 ` [Qemu-devel] [v2 1/2] cutils: " Liang Li
2015-11-12 10:08 ` Paolo Bonzini
2015-11-12 10:12 ` Li, Liang Z
2015-11-12 11:30 ` Juan Quintela
2015-11-13 2:49 ` Li, Liang Z
2015-11-13 9:30 ` Paolo Bonzini [this message]
2015-11-12 14:43 ` Richard Henderson
2015-11-10 2:51 ` [Qemu-devel] [v2 2/2] configure: add options to config avx2 Liang Li
2015-11-10 3:43 ` [Qemu-devel] [v2 0/2] add avx2 instruction optimization Eric Blake
2015-11-10 5:48 ` Li, Liang Z
2015-11-10 9:13 ` Juan Quintela
2015-11-10 9:26 ` Li, Liang Z
2015-11-10 9:35 ` Paolo Bonzini
2015-11-10 9:41 ` Li, Liang Z
2015-11-10 9:50 ` Paolo Bonzini
2015-11-10 9:56 ` Li, Liang Z
2015-11-10 10:00 ` Paolo Bonzini
2015-11-10 10:04 ` Li, Liang Z
2015-11-12 2:49 ` Li, Liang Z
2015-11-12 8:43 ` Paolo Bonzini
2015-11-12 8:53 ` Li, Liang Z
2015-11-12 9:04 ` Paolo Bonzini
2015-11-12 9:40 ` Li, Liang Z
2015-11-12 9:45 ` Paolo Bonzini
2015-11-12 9:53 ` Li, Liang Z
2015-11-12 11:34 ` Juan Quintela
2015-11-12 11:42 ` Li, Liang Z
2015-11-12 19:56 ` Dr. David Alan Gilbert
2015-11-12 20:20 ` Eric Blake
2016-04-07 11:09 ` Dr. David Alan Gilbert
2016-04-07 12:54 ` Michael S. Tsirkin
2016-04-07 13:42 ` Dr. David Alan Gilbert
2016-04-07 13:54 ` Paolo Bonzini
2015-11-10 9:30 ` Paolo Bonzini
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