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Re: [Qemu-arm] [Qemu-devel] [PATCH 0/7] Improve buffer_is_zero
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [Qemu-arm] [Qemu-devel] [PATCH 0/7] Improve buffer_is_zero |
Date: |
Wed, 24 Aug 2016 09:34:57 +0100 |
User-agent: |
Mutt/1.6.2 (2016-07-01) |
cc'ing in Liang Li who did the original avx2 code.
Dave
* Richard Henderson (address@hidden) wrote:
> Patches 1-3 remove the use of ifunc from the implementation.
>
> Patch 5 adjusts the x86 implementation a bit more to take
> advantage of ptest (in sse4.1) and unaligned accesses (in avx1).
>
> Patches 2 and 6 are the result of my conversation with Vijaya
> Kumar with respect to ThunderX.
>
> Patch 7 is the result of seeing some really really horrible code
> produced for ppc64le (gcc 4.9 and mainline).
>
> This has had limited testing. What I don't know is the best way
> to benchmark this -- the only way I know to trigger this is via
> the console, by hand, which doesn't make for reasonable timing.
>
>
> r~
>
>
> Richard Henderson (7):
> cutils: Remove SPLAT macro
> cutils: Export only buffer_is_zero
> cutils: Rearrange buffer_is_zero acceleration
> cutils: Add generic prefetch
> cutils: Rewrite x86 buffer zero checking
> cutils: Rewrite aarch64 buffer zero checking
> cutils: Rewrite ppc buffer zero checking
>
> configure | 21 +-
> include/qemu/cutils.h | 2 -
> migration/ram.c | 2 +-
> migration/rdma.c | 5 +-
> util/cutils.c | 526
> +++++++++++++++++++++++++++++++++-----------------
> 5 files changed, 352 insertions(+), 204 deletions(-)
>
> --
> 2.7.4
>
>
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK
- [Qemu-arm] [PATCH 2/7] cutils: Export only buffer_is_zero, (continued)
- [Qemu-arm] [PATCH 2/7] cutils: Export only buffer_is_zero, Richard Henderson, 2016/08/24
- [Qemu-arm] [PATCH 3/7] cutils: Rearrange buffer_is_zero acceleration, Richard Henderson, 2016/08/24
- [Qemu-arm] [PATCH 5/7] cutils: Rewrite x86 buffer zero checking, Richard Henderson, 2016/08/24
- [Qemu-arm] [PATCH 6/7] cutils: Rewrite aarch64 buffer zero checking, Richard Henderson, 2016/08/24
- [Qemu-arm] [PATCH 7/7] cutils: Rewrite ppc buffer zero checking, Richard Henderson, 2016/08/24
- Re: [Qemu-arm] [Qemu-devel] [PATCH 0/7] Improve buffer_is_zero, no-reply, 2016/08/24
- Re: [Qemu-arm] [Qemu-devel] [PATCH 0/7] Improve buffer_is_zero,
Dr. David Alan Gilbert <=
Re: [Qemu-arm] [PATCH 0/7] Improve buffer_is_zero, Vijay Kilari, 2016/08/25