From: Richard Henderson <rth@twiddle.net>
To: Liang Li <liang.z.li@intel.com>, qemu-devel@nongnu.org
Cc: amit.shah@redhat.com, pbonzini@redhat.com, mst@redhat.com,
quintela@redhat.com
Subject: Re: [Qemu-devel] [v2 1/2] cutils: add avx2 instruction optimization
Date: Thu, 12 Nov 2015 15:43:29 +0100 [thread overview]
Message-ID: <5644A591.90605@twiddle.net> (raw)
In-Reply-To: <1447123907-26750-2-git-send-email-liang.z.li@intel.com>
On 11/10/2015 03:51 AM, Liang Li wrote:
> +__asm__(".type can_use_buffer_find_nonzero_offset, \%gnu_indirect_function");
> +__asm__(".type buffer_find_nonzero_offset, \%gnu_indirect_function");
> +
> +
> +void *can_use_buffer_find_nonzero_offset_ifunc(void) \
> + __asm__("can_use_buffer_find_nonzero_offset");
> +
> +void *buffer_find_nonzero_offset_ifunc(void) \
> + __asm__("buffer_find_nonzero_offset");
Not keen on this. You can use the ifunc attribute instead of inline asm, and
the target attribute to enable per-function use of avx2. And if neither are
supported, due to compiler limitations, I don't think you should attempt to
work around that.
r~
next prev parent reply other threads:[~2015-11-12 14:43 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
2015-11-12 14:43 ` Richard Henderson [this message]
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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