1  /* contrib/powerpc-vsx/linux_aux.c
       2   *
       3   * Copyright (c) 2017 Glenn Randers-Pehrson
       4   * Written by Vadim Barkov, 2017.
       5   *
       6   * This code is released under the libpng license.
       7   * For conditions of distribution and use, see the disclaimer
       8   * and license in png.h
       9   *
      10   * STATUS: TESTED
      11   * BUG REPORTS: png-mng-implement@sourceforge.net
      12   *
      13   * png_have_vsx implemented for Linux by using the auxiliary vector mechanism.
      14   *
      15   * This code is strict ANSI-C and is probably moderately portable; it does
      16   * however use <stdio.h> and it assumes that /proc/cpuinfo is never localized.
      17   */
      18  
      19  #include "sys/auxv.h"
      20  #include "png.h"
      21  
      22  static int
      23  png_have_vsx(png_structp png_ptr)
      24  {
      25     unsigned long auxv = getauxval(AT_HWCAP);
      26  
      27     PNG_UNUSED(png_ptr)
      28  
      29     if(auxv & (PPC_FEATURE_HAS_ALTIVEC|PPC_FEATURE_HAS_VSX))
      30        return 1;
      31     else
      32        return 0;
      33  }