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[Qemu-devel] [PATCH 0/7] Improve buffer_is_zero
From: |
Richard Henderson |
Subject: |
[Qemu-devel] [PATCH 0/7] Improve buffer_is_zero |
Date: |
Tue, 23 Aug 2016 21:17:52 -0700 |
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
- [Qemu-devel] [PATCH 0/7] Improve buffer_is_zero,
Richard Henderson <=
- [Qemu-devel] [PATCH 4/7] cutils: Add generic prefetch, Richard Henderson, 2016/08/24
- [Qemu-devel] [PATCH 2/7] cutils: Export only buffer_is_zero, Richard Henderson, 2016/08/24
- [Qemu-devel] [PATCH 1/7] cutils: Remove SPLAT macro, Richard Henderson, 2016/08/24
- [Qemu-devel] [PATCH 3/7] cutils: Rearrange buffer_is_zero acceleration, Richard Henderson, 2016/08/24
- [Qemu-devel] [PATCH 5/7] cutils: Rewrite x86 buffer zero checking, Richard Henderson, 2016/08/24
- [Qemu-devel] [PATCH 6/7] cutils: Rewrite aarch64 buffer zero checking, Richard Henderson, 2016/08/24
- [Qemu-devel] [PATCH 7/7] cutils: Rewrite ppc buffer zero checking, Richard Henderson, 2016/08/24
- Re: [Qemu-devel] [PATCH 0/7] Improve buffer_is_zero, no-reply, 2016/08/24