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).
Patches 3 and 7 are the result of my conversation with Vijaya
Kumar with respect to ThunderX.
Patch 8 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.
Changes v1-v2:
* Add patch 1, moving everything to a new file.
* Fix a typo or two, which had the wrong sense of zero test.
These had mostly beed fixed in the intermediate patches,
but it wouldn't have helped bisection.
r~
Richard Henderson (8):
cutils: Move buffer_is_zero and subroutines to a new file
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/Makefile.objs | 1 +
util/bufferiszero.c | 432 ++++++++++++++++++++++++++++++++++++++++++++++++++
util/cutils.c | 244 ----------------------------
7 files changed, 441 insertions(+), 266 deletions(-)
create mode 100644 util/bufferiszero.c
--
2.7.4
