#ifndef SIMDJSON_IMPLEMENTATION_DETECTION_H
#define SIMDJSON_IMPLEMENTATION_DETECTION_H

#include "simdjson/base.h"

// 0 is reserved, because undefined SIMDJSON_IMPLEMENTATION equals 0 in preprocessor macros.
#define SIMDJSON_IMPLEMENTATION_ID_arm64 1
#define SIMDJSON_IMPLEMENTATION_ID_fallback 2
#define SIMDJSON_IMPLEMENTATION_ID_haswell 3
#define SIMDJSON_IMPLEMENTATION_ID_icelake 4
#define SIMDJSON_IMPLEMENTATION_ID_ppc64 5
#define SIMDJSON_IMPLEMENTATION_ID_westmere 6
#define SIMDJSON_IMPLEMENTATION_ID_lsx 7
#define SIMDJSON_IMPLEMENTATION_ID_lasx 8
//#define SIMDJSON_IMPLEMENTATION_ID_rvv 9
#define SIMDJSON_IMPLEMENTATION_ID_rvv_vls 10

#define SIMDJSON_IMPLEMENTATION_ID_FOR(IMPL) SIMDJSON_CAT(SIMDJSON_IMPLEMENTATION_ID_, IMPL)
#define SIMDJSON_IMPLEMENTATION_ID SIMDJSON_IMPLEMENTATION_ID_FOR(SIMDJSON_IMPLEMENTATION)

#define SIMDJSON_IMPLEMENTATION_IS(IMPL) SIMDJSON_IMPLEMENTATION_ID == SIMDJSON_IMPLEMENTATION_ID_FOR(IMPL)

//
// First, figure out which implementations can be run. Doing it here makes it so we don't have to worry about the order
// in which we include them.
//

#ifndef SIMDJSON_IMPLEMENTATION_ARM64
#define SIMDJSON_IMPLEMENTATION_ARM64 (SIMDJSON_IS_ARM64)
#endif
#if SIMDJSON_IMPLEMENTATION_ARM64 && SIMDJSON_IS_ARM64
#define SIMDJSON_CAN_ALWAYS_RUN_ARM64 1
#else
#define SIMDJSON_CAN_ALWAYS_RUN_ARM64 0
#endif

// Default Icelake to on if this is x86-64. Even if we're not compiled for it, it could be selected
// at runtime.
#ifndef SIMDJSON_IMPLEMENTATION_ICELAKE
#define SIMDJSON_IMPLEMENTATION_ICELAKE ((SIMDJSON_IS_X86_64) && (SIMDJSON_AVX512_ALLOWED) && (SIMDJSON_COMPILER_SUPPORTS_VBMI2))
#endif

#ifdef _MSC_VER
// To see why  (__BMI__) && (__PCLMUL__) && (__LZCNT__) are not part of this next line, see
// https://github.com/simdjson/simdjson/issues/1247
#if ((SIMDJSON_IMPLEMENTATION_ICELAKE) && (__AVX2__) && (__AVX512F__) && (__AVX512DQ__) && (__AVX512CD__) && (__AVX512BW__) && (__AVX512VL__) && (__AVX512VBMI2__))
#define SIMDJSON_CAN_ALWAYS_RUN_ICELAKE 1
#else
#define SIMDJSON_CAN_ALWAYS_RUN_ICELAKE 0
#endif

#else

#if ((SIMDJSON_IMPLEMENTATION_ICELAKE) && (__AVX2__) && (__BMI__) && (__PCLMUL__) && (__LZCNT__) && (__AVX512F__) && (__AVX512DQ__) && (__AVX512CD__) && (__AVX512BW__) && (__AVX512VL__) && (__AVX512VBMI2__))
#define SIMDJSON_CAN_ALWAYS_RUN_ICELAKE 1
#else
#define SIMDJSON_CAN_ALWAYS_RUN_ICELAKE 0
#endif

#endif

// Default Haswell to on if this is x86-64. Even if we're not compiled for it, it could be selected
// at runtime.
#ifndef SIMDJSON_IMPLEMENTATION_HASWELL
#if SIMDJSON_CAN_ALWAYS_RUN_ICELAKE
// if icelake is always available, never enable haswell.
#define SIMDJSON_IMPLEMENTATION_HASWELL 0
#else
#define SIMDJSON_IMPLEMENTATION_HASWELL SIMDJSON_IS_X86_64
#endif
#endif
#ifdef _MSC_VER
// To see why  (__BMI__) && (__PCLMUL__) && (__LZCNT__) are not part of this next line, see
// https://github.com/simdjson/simdjson/issues/1247
#if ((SIMDJSON_IMPLEMENTATION_HASWELL) && (SIMDJSON_IS_X86_64) && (__AVX2__))
#define SIMDJSON_CAN_ALWAYS_RUN_HASWELL 1
#else
#define SIMDJSON_CAN_ALWAYS_RUN_HASWELL 0
#endif

#else

#if ((SIMDJSON_IMPLEMENTATION_HASWELL) && (SIMDJSON_IS_X86_64) && (__AVX2__) && (__BMI__) && (__PCLMUL__) && (__LZCNT__))
#define SIMDJSON_CAN_ALWAYS_RUN_HASWELL 1
#else
#define SIMDJSON_CAN_ALWAYS_RUN_HASWELL 0
#endif

#endif

// Default Westmere to on if this is x86-64.
#ifndef SIMDJSON_IMPLEMENTATION_WESTMERE
#if SIMDJSON_CAN_ALWAYS_RUN_ICELAKE || SIMDJSON_CAN_ALWAYS_RUN_HASWELL
// if icelake or haswell are always available, never enable westmere.
#define SIMDJSON_IMPLEMENTATION_WESTMERE 0
#else
#define SIMDJSON_IMPLEMENTATION_WESTMERE SIMDJSON_IS_X86_64
#endif
#endif

#if (SIMDJSON_IMPLEMENTATION_WESTMERE && SIMDJSON_IS_X86_64 && __SSE4_2__ && __PCLMUL__)
#define SIMDJSON_CAN_ALWAYS_RUN_WESTMERE 1
#else
#define SIMDJSON_CAN_ALWAYS_RUN_WESTMERE 0
#endif


#ifndef SIMDJSON_IMPLEMENTATION_PPC64
#define SIMDJSON_IMPLEMENTATION_PPC64 (SIMDJSON_IS_PPC64 && SIMDJSON_IS_PPC64_VMX)
#endif
#if SIMDJSON_IMPLEMENTATION_PPC64 && SIMDJSON_IS_PPC64 && SIMDJSON_IS_PPC64_VMX
#define SIMDJSON_CAN_ALWAYS_RUN_PPC64 1
#else
#define SIMDJSON_CAN_ALWAYS_RUN_PPC64 0
#endif

#ifndef SIMDJSON_IMPLEMENTATION_LASX
#define SIMDJSON_IMPLEMENTATION_LASX (SIMDJSON_IS_LSX)
#endif
#define SIMDJSON_CAN_ALWAYS_RUN_LASX (SIMDJSON_IS_LASX)

#ifndef SIMDJSON_IMPLEMENTATION_LSX
#if SIMDJSON_CAN_ALWAYS_RUN_LASX
#define SIMDJSON_IMPLEMENTATION_LSX 0
#else
#define SIMDJSON_IMPLEMENTATION_LSX (SIMDJSON_IS_LSX)
#endif
#endif
#define SIMDJSON_CAN_ALWAYS_RUN_LSX (SIMDJSON_IMPLEMENTATION_LSX)

#define SIMDJSON_CAN_ALWAYS_RUN_RVV_VLS SIMDJSON_IS_RVV_VLS
#ifndef SIMDJSON_IMPLEMENTATION_RVV_VLS
#define SIMDJSON_IMPLEMENTATION_RVV_VLS SIMDJSON_CAN_ALWAYS_RUN_RVV_VLS
#endif

// Default Fallback to on unless a builtin implementation has already been selected.
#ifndef SIMDJSON_IMPLEMENTATION_FALLBACK
#if SIMDJSON_CAN_ALWAYS_RUN_ARM64 || SIMDJSON_CAN_ALWAYS_RUN_ICELAKE || SIMDJSON_CAN_ALWAYS_RUN_HASWELL || SIMDJSON_CAN_ALWAYS_RUN_WESTMERE || SIMDJSON_CAN_ALWAYS_RUN_PPC64 || SIMDJSON_CAN_ALWAYS_RUN_LSX || SIMDJSON_CAN_ALWAYS_RUN_LASX || SIMDJSON_CAN_ALWAYS_RUN_RVV_VLS
// if anything at all except fallback can always run, then disable fallback.
#define SIMDJSON_IMPLEMENTATION_FALLBACK 0
#else
#define SIMDJSON_IMPLEMENTATION_FALLBACK 1
#endif
#endif
#define SIMDJSON_CAN_ALWAYS_RUN_FALLBACK SIMDJSON_IMPLEMENTATION_FALLBACK

// Determine the best builtin implementation
#ifndef SIMDJSON_BUILTIN_IMPLEMENTATION

#if SIMDJSON_CAN_ALWAYS_RUN_ICELAKE
#define SIMDJSON_BUILTIN_IMPLEMENTATION icelake
#elif SIMDJSON_CAN_ALWAYS_RUN_HASWELL
#define SIMDJSON_BUILTIN_IMPLEMENTATION haswell
#elif SIMDJSON_CAN_ALWAYS_RUN_WESTMERE
#define SIMDJSON_BUILTIN_IMPLEMENTATION westmere
#elif SIMDJSON_CAN_ALWAYS_RUN_ARM64
#define SIMDJSON_BUILTIN_IMPLEMENTATION arm64
#elif SIMDJSON_CAN_ALWAYS_RUN_PPC64
#define SIMDJSON_BUILTIN_IMPLEMENTATION ppc64
#elif SIMDJSON_CAN_ALWAYS_RUN_LSX
#define SIMDJSON_BUILTIN_IMPLEMENTATION lsx
#elif SIMDJSON_CAN_ALWAYS_RUN_LASX
#define SIMDJSON_BUILTIN_IMPLEMENTATION lasx
#elif SIMDJSON_CAN_ALWAYS_RUN_RVV_VLS
#define SIMDJSON_BUILTIN_IMPLEMENTATION rvv_vls
#elif SIMDJSON_CAN_ALWAYS_RUN_FALLBACK
#define SIMDJSON_BUILTIN_IMPLEMENTATION fallback
#else
#error "All possible implementations (including fallback) have been disabled! simdjson will not run."
#endif

#endif // SIMDJSON_BUILTIN_IMPLEMENTATION

#define SIMDJSON_BUILTIN_IMPLEMENTATION_ID SIMDJSON_IMPLEMENTATION_ID_FOR(SIMDJSON_BUILTIN_IMPLEMENTATION)
#define SIMDJSON_BUILTIN_IMPLEMENTATION_IS(IMPL) SIMDJSON_BUILTIN_IMPLEMENTATION_ID == SIMDJSON_IMPLEMENTATION_ID_FOR(IMPL)

#endif // SIMDJSON_IMPLEMENTATION_DETECTION_H
