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host.c

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/* AUTORIGHTS
Copyright (C) 2007-10 Andrea Vedaldi and Brian Fulkerson

This file is part of VLFeat, available under the terms of the
GNU GPLv2, or (at your option) any later version.
*/

#include "host.h"
#include "generic.h"
#include <stdio.h>

#if defined(VL_ARCH_IX86) || defined(VL_ARCH_IA64) || defined(VL_ARCH_X64)
#define HAS_CPUID
#else
#undef HAS_CPUID
#endif

#if defined(HAS_CPUID) & defined(VL_COMPILER_MSC)
#include <intrin.h>
VL_INLINE void
_vl_cpuid (vl_int32* info, int function)
{
  __cpuid(info, function) ;
}
#endif

#if defined(HAS_CPUID) & defined(VL_COMPILER_GNUC)
VL_INLINE void
_vl_cpuid (vl_int32* info, int function)
{
#if defined(VL_ARCH_IX86) && (defined(__PIC__) || defined(__pic__))
  /* This version is compatible with -fPIC on x386 targets. This special
   * case is required becaus
   * on such platform -fPIC alocates ebx as global offset table pointer.
   * Note that =r below will be mapped to a register different from ebx,
   * so the code is sound. */
  __asm__ __volatile__
  ("pushl %%ebx      \n" /* save %ebx */
   "cpuid            \n"
   "movl %%ebx, %1   \n" /* save what cpuid just put in %ebx */
   "popl %%ebx       \n" /* restore the old %ebx */
   : "=a"(info[0]), "=r"(info[1]), "=c"(info[2]), "=d"(info[3])
   : "a"(function)
   : "cc") ; /* clobbered (cc=condition codes) */
#else /* no -fPIC or -fPIC with a 64-bit target */
  __asm__ __volatile__
  ("cpuid"
   : "=a"(info[0]), "=b"(info[1]), "=c"(info[2]), "=d"(info[3])
   : "a"(function)
   : "cc") ;
#endif
}

#endif

void
_vl_x86cpu_info_init (VlX86CpuInfo *self)
{
  vl_int32 info [4] ;
  int max_func = 0 ;
  _vl_cpuid(info, 0) ;
  max_func = info[0] ;
  self->vendor.words[0] = info[1] ;
  self->vendor.words[1] = info[3] ;
  self->vendor.words[2] = info[2] ;

  if (max_func >= 1) {
    _vl_cpuid(info, 1) ;
    self->hasMMX   = info[3] & (1 << 23) ;
    self->hasSSE   = info[3] & (1 << 25) ;
    self->hasSSE2  = info[3] & (1 << 26) ;
    self->hasSSE3  = info[2] & (1 <<  0) ;
    self->hasSSE41 = info[2] & (1 << 19) ;
    self->hasSSE42 = info[2] & (1 << 20) ;
  }
}

char *
_vl_x86cpu_info_to_string_copy (VlX86CpuInfo const *self)
{
  char * string = 0 ;
  int length = 0 ;
  while (string == 0) {
    if (length > 0) {
      string = vl_malloc(sizeof(char) * length) ;
      if (string == NULL) break ;
    }
    length = snprintf(string, length, "%s%s%s%s%s%s%s",
                      self->vendor.string,
                      self->hasMMX   ? " MMX" : "",
                      self->hasSSE   ? " SSE" : "",
                      self->hasSSE2  ? " SSE2" : "",
                      self->hasSSE3  ? " SSE3" : "",
                      self->hasSSE41 ? " SSE41" : "",
                      self->hasSSE42 ? " SSE42" : "") ;
    length += 1 ;
  }
  return string ;
}

VL_EXPORT char *
vl_static_configuration_to_string_copy ()
{
  char const * hostString =
#ifdef VL_ARCH_X64
  "X64"
#endif
#ifdef VL_ARCH_IA64
  "IA64"
#endif
#ifdef VL_ARCH_IX86
  "IX86"
#endif
#ifdef VL_ARCH_PPC
  "PPC"
#endif
  ", "
#ifdef VL_ARCH_BIG_ENDIAN
  "big_endian"
#endif
#ifdef VL_ARCH_LITTLE_ENDIAN
  "little_endian"
#endif
  ;

  char compilerString [1024] ;

  char const * libraryString =
#ifndef VL_DISABLE_THREADS
#ifdef VL_THREADS_WIN
  "Windows_threads"
#elif VL_THREADS_POSIX
  "POSIX_threads"
#endif
#else
  "No_threads"
#endif
#ifndef VL_DISABLE_SSE2
  ", SSE2"
#endif
  ;

snprintf(compilerString, 1024,
#ifdef VL_COMPILER_MSC
  "Microsoft Visual C++ %d"
#define v VL_COMPILER_MSC
#endif
#ifdef VL_COMPILER_GNUC
  "GNU C %d"
#define v VL_COMPILER_GNUC
#endif
  " "
#ifdef VL_COMPILER_LP64
  "LP64"
#endif
#ifdef VL_COMPILER_LLP64
  "LP64"
#endif
#ifdef VL_COMPILER_ILP32
  "ILP32"
#endif
           , v) ;

  {
    char * string = 0 ;
    int length = 0 ;
    while (string == 0) {
      if (length > 0) {
        string = vl_malloc(sizeof(char) * length) ;
        if (string == NULL) break ;
      }
      length = snprintf(string, length, "%s, %s, %s",
                        hostString,
                        compilerString,
                        libraryString) ;
      length += 1 ;
    }
    return string ;
  }
}

 

© 2005-10 Andrea Vedaldi and Brian Fulkerson