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util: add util function buffer_zero_avx512()

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And intialize buffer_is_zero() with it, when Intel AVX512F is
available on host.

This function utilizes Intel AVX512 fundamental instructions which
is faster than its implementation with AVX2 (in my unit test, with
4K buffer, on CascadeLake SP, ~36% faster, buffer_zero_avx512() V.S.
buffer_zero_avx2()).

Signed-off-by: Robert Hoo <robert.hu@linux.intel.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Robert Hoo 2020-02-29 20:34:35 +08:00 • committed by Paolo Bonzini
parent 6b8cd447ef
commit 27f08ea1c7
2 changed files with 64 additions and 10 deletions
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3
include/qemu/cpuid.h
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@ -45,6 +45,9 @@
#ifndef bit_AVX2
#define bit_AVX2 (1 << 5)
#endif
#ifndef bit_AVX512F
#define bit_AVX512F (1 << 16)
#endif
#ifndef bit_BMI2
#define bit_BMI2 (1 << 8)
#endif