cpu_avx512_knl.c
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#if defined(DETECT_FEATURES) && defined(__INTEL_COMPILER) /* * Unlike GCC and CLANG, Intel Compiler exposes all supported intrinsics, * whether or not the build options for those features are specified. * Therefore, we must test #definitions of CPU features when option native/host * is enabled via `--cpu-baseline` or through env var `CFLAGS` otherwise * the test will be broken and leads to enable all possible features. */ #if !defined(__AVX512ER__) || !defined(__AVX512PF__) #error "HOST/ARCH doesn't support Knights Landing AVX512 features" #endif #endif #include <immintrin.h> int main(int argc, char **argv) { int base[128]; __m512d ad = _mm512_loadu_pd((const __m512d*)argv[argc-1]); /* ER */ __m512i a = _mm512_castpd_si512(_mm512_exp2a23_pd(ad)); /* PF */ _mm512_mask_prefetch_i64scatter_pd(base, _mm512_cmpeq_epi64_mask(a, a), a, 1, _MM_HINT_T1); return base[0]; }
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