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/******************************************************************************
* Copyright (c) Intel Corporation - All rights reserved.                      *
* This file is part of the LIBXSMM library.                                   *
*                                                                             *
* For information on the license, see the LICENSE file.                       *
* Further information: https://github.com/hfp/libxsmm/                        *
* SPDX-License-Identifier: BSD-3-Clause                                       *
******************************************************************************/
/* Hans Pabst (Intel Corp.)
******************************************************************************/
#ifndef LIBXSMM_CPUID_H
#define LIBXSMM_CPUID_H

#include "libxsmm_macros.h"

/**
 * Enumerates the available target architectures and instruction
 * set extensions as returned by libxsmm_get_target_archid().
 * LIBXSMM_X86_ALLFEAT: pseudo-value enabling all features
 * used anywhere in LIBXSMM (never set as an architecture,
 * used as an upper bound in comparisons to distinct x86).
 */
#define LIBXSMM_TARGET_ARCH_UNKNOWN 0
#define LIBXSMM_TARGET_ARCH_GENERIC 1
#define LIBXSMM_X86_GENERIC      1002
#define LIBXSMM_X86_SSE3         1003
#define LIBXSMM_X86_SSE42        1004
#define LIBXSMM_X86_AVX          1005
#define LIBXSMM_X86_AVX2         1006
#define LIBXSMM_X86_AVX512       1007
#define LIBXSMM_X86_AVX512_MIC   1010 /* KNL */
#define LIBXSMM_X86_AVX512_KNM   1011
#define LIBXSMM_X86_AVX512_CORE  1020 /* SKX */
#define LIBXSMM_X86_AVX512_CLX   1021
#define LIBXSMM_X86_AVX512_CPX   1022
#define LIBXSMM_X86_AVX512_SPR   1023
#define LIBXSMM_X86_ALLFEAT      1999
#define LIBXSMM_AARCH64_V81      2001 /* Baseline */
#define LIBXSMM_AARCH64_V82      2002 /* A64FX minus SVE */
#define LIBXSMM_AARCH64_A64FX    2100 /* SVE */
#define LIBXSMM_AARCH64_ALLFEAT  2999

#if defined(LIBXSMM_PLATFORM_X86)
/** Zero-initialized structure; assumes conservative properties. */
LIBXSMM_EXTERN_C typedef struct LIBXSMM_RETARGETABLE libxsmm_cpuid_info {
  int constant_tsc; /** Timer stamp counter is monotonic. */
  int has_context;  /** Context switches are permitted. */
} libxsmm_cpuid_info;
#else
typedef int libxsmm_cpuid_info;
#endif

/** Returns the target architecture and instruction set extensions. */
#if defined(__cplusplus) /* note: stay compatible with TF */
LIBXSMM_API int libxsmm_cpuid_x86(libxsmm_cpuid_info* info = NULL);
LIBXSMM_API int libxsmm_cpuid_arm(libxsmm_cpuid_info* info = NULL);
#else
LIBXSMM_API int libxsmm_cpuid_x86(libxsmm_cpuid_info* info);
LIBXSMM_API int libxsmm_cpuid_arm(libxsmm_cpuid_info* info);
#endif

/**
 * Similar to libxsmm_cpuid_x86, but conceptually not x86-specific.
 * The actual code path (as used by LIBXSMM) is determined by
 * libxsmm_[get|set]_target_archid/libxsmm_[get|set]_target_arch.
 */
LIBXSMM_API int libxsmm_cpuid(void);

/** Names the CPU architecture given by CPUID. */
LIBXSMM_API const char* libxsmm_cpuid_name(int id);

/** SIMD vector length (VLEN) in 32-bit elements. */
LIBXSMM_API int libxsmm_cpuid_vlen32(int id);

#endif /*LIBXSMM_CPUID_H*/