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Editing: cpu_fma3.c
#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(__FMA__) && !defined(__AVX2__) #error "HOST/ARCH doesn't support FMA3" #endif #endif #include <xmmintrin.h> #include <immintrin.h> int main(int argc, char **argv) { __m256 a = _mm256_loadu_ps((const float*)argv[argc-1]); a = _mm256_fmadd_ps(a, a, a); return (int)_mm_cvtss_f32(_mm256_castps256_ps128(a)); }
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