35 lines
977 B
C
35 lines
977 B
C
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/* contrib/powerpc-vsx/linux.c
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*
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* Copyright (c) 2016 Glenn Randers-Pehrson
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* Written by Vadim Barkov, 2017.
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*
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* This code is released under the libpng license.
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* For conditions of distribution and use, see the disclaimer
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* and license in png.h
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*
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* SEE contrib/powerpc-vsx/README before reporting bugs
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*
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* STATUS: COMPILED
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* BUG REPORTS: png-mng-implement@sourceforge.net
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*
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* png_have_vsx implemented for Linux by reading the widely available
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* pseudo-file /proc/cpuinfo. Result is cached so if function will be called
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* multiple times only one reading is perfomed.
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*
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* This code is strict ANSI-C and is probably moderately portable; it does
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* however use <stdio.h> and it assumes that /proc/cpuinfo is never localized.
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*/
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#include "sys/auxv.h"
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#include "png.h"
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static int
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png_have_vsx(png_structp png_ptr)
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{
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const unsigned long auxv = getauxval( AT_HWCAP );
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if(auxv & (PPC_FEATURE_HAS_ALTIVEC|PPC_FEATURE_HAS_VSX ))
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return 1;
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else
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return 0;
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}
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