torch/include/ATen/native/cpu/Intrinsics.h

#pragma once

#if defined(__clang__) && (defined(__x86_64__) || defined(__i386__))
/* Clang-compatible compiler, targeting x86/x86-64 */
#include <x86intrin.h>
#elif defined(_MSC_VER)
/* Microsoft C/C++-compatible compiler */
#include <intrin.h>
#if _MSC_VER <= 1900
#define _mm256_extract_epi64(X, Y) (((uint64_t*)&X)[Y])
#endif
#elif defined(__GNUC__) && (defined(__x86_64__) || defined(__i386__))
/* GCC-compatible compiler, targeting x86/x86-64 */
#include <x86intrin.h>
#elif defined(__GNUC__) && defined(__ARM_NEON__)
/* GCC-compatible compiler, targeting ARM with NEON */
#include <arm_neon.h>
#elif defined(__GNUC__) && defined(__IWMMXT__)
/* GCC-compatible compiler, targeting ARM with WMMX */
#include <mmintrin.h>
#elif (defined(__GNUC__) || defined(__xlC__)) && \
    (defined(__VEC__) || defined(__ALTIVEC__))
/* XLC or GCC-compatible compiler, targeting PowerPC with VMX/VSX */
#include <altivec.h>
/* We need to undef those tokens defined by <altivec.h> to avoid conflicts
   with the C++ types. => Can still use __bool/__vector */
#undef bool
#undef vector
#undef pixel
#elif defined(__GNUC__) && defined(__SPE__)
/* GCC-compatible compiler, targeting PowerPC with SPE */
#include <spe.h>
#endif