diff options
| author | Robert Hoo <robert.hu@linux.intel.com> | 2020-02-29 20:34:35 +0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-03-16 23:02:21 +0100 |
| commit | 27f08ea1c7abf04125f6f9f23b8ba2f8c20e95b6 (patch) | |
| tree | d662b5e1b0feb05cedcdab370651c895abc41c97 /include | |
| parent | 6b8cd447efdad1d8bb637904e5077900d063e05d (diff) | |
util: add util function buffer_zero_avx512()
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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/qemu/cpuid.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/qemu/cpuid.h b/include/qemu/cpuid.h index 69301700bd..09fc245b91 100644 --- a/include/qemu/cpuid.h +++ b/include/qemu/cpuid.h @@ -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 |