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Re: [Qemu-devel] [PATCH v2 0/8] Improve buffer_is_zero
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From: |
Eric Blake |
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Subject: |
Re: [Qemu-devel] [PATCH v2 0/8] Improve buffer_is_zero |
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Date: |
Wed, 24 Aug 2016 14:18:51 -0500 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 |
On 08/24/2016 12:48 PM, Richard Henderson wrote:
> Patches 1-4 remove the use of ifunc from the implementation.
>
> Patch 6 adjusts the x86 implementation a bit more to take
> advantage of ptest (in sse4.1) and unaligned accesses (in avx1).
Do we really care about unaligned access? Or can we guarantee that all
our calls to buffer_is_zero are already aligned, and make optimizations
along those lines?
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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- [Qemu-devel] [PATCH v2 0/8] Improve buffer_is_zero, Richard Henderson, 2016/08/24
- [Qemu-devel] [PATCH v2 3/8] cutils: Export only buffer_is_zero, Richard Henderson, 2016/08/24
- [Qemu-devel] [PATCH v2 5/8] cutils: Add generic prefetch, Richard Henderson, 2016/08/24
- [Qemu-devel] [PATCH v2 1/8] cutils: Move buffer_is_zero and subroutines to a new file, Richard Henderson, 2016/08/24
- [Qemu-devel] [PATCH v2 4/8] cutils: Rearrange buffer_is_zero acceleration, Richard Henderson, 2016/08/24
- [Qemu-devel] [PATCH v2 6/8] cutils: Rewrite x86 buffer zero checking, Richard Henderson, 2016/08/24
- [Qemu-devel] [PATCH v2 8/8] cutils: Rewrite ppc buffer zero checking, Richard Henderson, 2016/08/24
- [Qemu-devel] [PATCH v2 7/8] cutils: Rewrite aarch64 buffer zero checking, Richard Henderson, 2016/08/24
- Re: [Qemu-devel] [PATCH v2 0/8] Improve buffer_is_zero,
Eric Blake <=
- Re: [Qemu-devel] [PATCH v2 0/8] Improve buffer_is_zero, Daniel P. Berrange, 2016/08/25