1) Introduce {enable,disable}-avx512f configure option
2) Implement new buffer_zero_avx512() with AVX512F instructions
Changes in v4:
In init_cpuid_cache(), stringently test AVX512F OS level enablement.
Changes in v3:
In init_accel(), init length_to_accel value in every accel case, because
in unit test, it will be invoked several times with different accel cases.
(Thanks Richard's careful review)
Changes in v2:
1. Fixes wrong definition of CACHE_SSE2 in v1.
2. Fixes not handle <256 length case in buffer_zero_avx512() implementaion.
(Follow Richard's suggestion: handle the case in select_accel_fn(), and have a
global variable alongside buffer_accel)
3. Changes avx512f configuration option's default status to disabled.
4. Ran 'make check-unit' on this patch, on both a Ivybridge machine and a
CascadeLake machine.
Robert Hoo (2):
configure: add configure option avx512f_opt
util: add util function buffer_zero_avx512()
configure | 41 +++++++++++++++++++++++++++++
include/qemu/cpuid.h | 3 +++
util/bufferiszero.c | 74 +++++++++++++++++++++++++++++++++++++++++++++-------
3 files changed, 108 insertions(+), 10 deletions(-)
--
1.8.3.1
