Line data    Source code

       1             : /*----------------------------------------------------------------------------*/
       2             : /*  CP2K: A general program to perform molecular dynamics simulations         */
       3             : /*  Copyright 2000-2024 CP2K developers group <https://cp2k.org>              */
       4             : /*                                                                            */
       5             : /*  SPDX-License-Identifier: GPL-2.0-or-later                                 */
       6             : /*----------------------------------------------------------------------------*/
       7             : 
       8             : /* shared between C and Fortran */
       9             : #include "machine_cpuid.h"
      10             : 
      11             : #if defined(__cplusplus)
      12             : extern "C" {
      13             : #endif
      14             : 
      15             : /*******************************************************************************
      16             :  * \brief This routine determines the CPUID according to the given compiler
      17             :  *        flags (expected to be similar to Fortran). Similar to other Fortran
      18             :  *        compilers, "gfortran -E -dM -mavx - < /dev/null | grep AVX" defines a
      19             :  *        variety of predefined macros (also similar to C). However, with a
      20             :  *        Fortran translation unit only a subset of these definitions disappears
      21             :  *        ("gfortran -E -dM -mavx my.F | grep AVX")
      22             :  *        hence an implementation in C is used.
      23             :  ******************************************************************************/
      24             : int m_cpuid_static(void); /* avoid pedantic warning about missing prototype */
      25        4667 : int m_cpuid_static(void) {
      26             : #if (defined(__x86_64__) && 0 != (__x86_64__)) ||                              \
      27             :     (defined(__amd64__) && 0 != (__amd64__)) ||                                \
      28             :     (defined(_M_X64) || defined(_M_AMD64)) ||                                  \
      29             :     (defined(__i386__) && 0 != (__i386__)) || (defined(_M_IX86))
      30             : #if (__AVX512F__ && __AVX512CD__ && __AVX2__ && __FMA__ && __AVX__ &&          \
      31             :      __SSE4_2__ && __SSE4_1__ && __SSE3__)
      32             :   return CP_MACHINE_X86_AVX512;
      33             : #elif (__AVX2__ && __FMA__ && __AVX__ && __SSE4_2__ && __SSE4_1__ && __SSE3__)
      34        4667 :   return CP_MACHINE_X86_AVX2;
      35             : #elif (__AVX__ && __SSE4_2__ && __SSE4_1__ && __SSE3__)
      36             :   return CP_MACHINE_X86_AVX;
      37             : #elif (__SSE4_2__ && __SSE4_1__ && __SSE3__)
      38             :   return CP_MACHINE_X86_SSE4;
      39             : #else
      40             :   return CP_MACHINE_CPU_GENERIC;
      41             : #endif
      42             : #elif defined(__aarch64__) || defined(__arm64__) || defined(_M_ARM64)
      43             :   /* only care about SVE, embrace "thermometer approach" like for x86 */
      44             : #if (512 <= __ARM_FEATURE_SVE_BITS)
      45             :   return CP_MACHINE_ARM_SVE512;
      46             : #elif (256 <= __ARM_FEATURE_SVE_BITS)
      47             :   return CP_MACHINE_ARM_SVE256;
      48             : #elif (128 <= __ARM_FEATURE_SVE_BITS)
      49             :   return CP_MACHINE_ARM_SVE128;
      50             : #else
      51             :   return CP_MACHINE_ARM_ARCH64;
      52             : #endif
      53             : #elif defined(__ARM_ARCH)
      54             :   return CP_MACHINE_CPU_GENERIC;
      55             : #else
      56             :   return CP_MACHINE_UNKNOWN;
      57             : #endif
      58             : }
      59             : 
      60             : #if defined(__cplusplus)
      61             : }
      62             : #endif