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IABSD.fr/xenocara/lib/libpng/mips/mips_init.c
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- lib/libpng/mips/mips_init.c
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/* mips_init.c - MSA optimised filter functions * * Copyright (c) 2018-2024 Cosmin Truta * Copyright (c) 2016 Glenn Randers-Pehrson * Written by Mandar Sahastrabuddhe, 2016 * Updated by guxiwei, 2023 * * This code is released under the libpng license. * For conditions of distribution and use, see the disclaimer * and license in png.h */ /* Below, after checking __linux__, various non-C90 POSIX 1003.1 functions are * called. */ #define _POSIX_SOURCE 1 #include <stdio.h> #include "../pngpriv.h" #ifdef PNG_READ_SUPPORTED #if PNG_MIPS_MSA_IMPLEMENTATION == 1 || PNG_MIPS_MMI_IMPLEMENTATION > 0 #ifdef PNG_MIPS_MSA_CHECK_SUPPORTED /* Do MIPS MSA run-time checks */ /* WARNING: it is strongly recommended that you do not build libpng with * run-time checks for CPU features if at all possible. In the case of the MIPS * MSA instructions there is no processor-specific way of detecting the * presence of the required support, therefore run-time detection is extremely * OS specific. * * You may set the macro PNG_MIPS_MSA_FILE to the file name of file containing * a fragment of C source code which defines the png_have_msa function. There * are a number of implementations in contrib/mips-msa, but the only one that * has partial support is contrib/mips-msa/linux.c - a generic Linux * implementation which reads /proc/cpufino. */ #ifndef PNG_MIPS_MSA_FILE # ifdef __linux__ # define PNG_MIPS_MSA_FILE "contrib/mips-msa/linux.c" # endif #endif #ifdef PNG_MIPS_MSA_FILE #include <signal.h> /* for sig_atomic_t */ static int png_have_msa(png_structp png_ptr); #include PNG_MIPS_MSA_FILE #else /* PNG_MIPS_MSA_FILE */ # error PNG_MIPS_MSA_FILE undefined: no support for run-time MIPS MSA checks #endif /* PNG_MIPS_MSA_FILE */ #endif /* PNG_MIPS_MSA_CHECK_SUPPORTED */ #ifdef PNG_MIPS_MMI_CHECK_SUPPORTED /* Do MIPS MMI run-times checks */ #ifndef PNG_MIPS_MMI_FILE # ifdef __linux__ # define PNG_MIPS_MMI_FILE "contrib/mips-mmi/linux.c" # endif #endif #ifdef PNG_MIPS_MMI_FILE #include <signal.h> /* for sig_atomic_t */ static int png_have_mmi(); #include PNG_MIPS_MMI_FILE #else /* PNG_MIPS_MMI_FILE */ # error PNG_MIPS_MMI_FILE undefined: no support for run-time MIPS MMI checks #endif /* PNG_MIPS_MMI_FILE */ #endif /* PNG_MIPS_MMI_CHECK_SUPPORTED*/ #ifndef PNG_ALIGNED_MEMORY_SUPPORTED # error ALIGNED_MEMORY is required; please define PNG_ALIGNED_MEMORY_SUPPORTED #endif /* MIPS supports two optimizations: MMI and MSA. The appropriate * optimization is chosen at runtime */ void png_init_filter_functions_mips(png_structp pp, unsigned int bpp) { #if PNG_MIPS_MMI_IMPLEMENTATION > 0 #ifdef PNG_MIPS_MMI_API_SUPPORTED switch ((pp->options >> PNG_MIPS_MMI) & 3) { case PNG_OPTION_UNSET: #endif /* PNG_MIPS_MMI_API_SUPPORTED */ #ifdef PNG_MIPS_MMI_CHECK_SUPPORTED { static volatile sig_atomic_t no_mmi = -1; /* not checked */ if (no_mmi < 0) no_mmi = !png_have_mmi(); if (no_mmi) goto MIPS_MSA_INIT; } #ifdef PNG_MIPS_MMI_API_SUPPORTED break; #endif #endif /* PNG_MIPS_MMI_CHECK_SUPPORTED */ #ifdef PNG_MIPS_MMI_API_SUPPORTED default: /* OFF or INVALID */ goto MIPS_MSA_INIT; case PNG_OPTION_ON: /* Option turned on */ break; } #endif pp->read_filter[PNG_FILTER_VALUE_UP-1] = png_read_filter_row_up_mmi; if (bpp == 3) { pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub3_mmi; pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg3_mmi; pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = png_read_filter_row_paeth3_mmi; } else if (bpp == 4) { pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub4_mmi; pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg4_mmi; pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = png_read_filter_row_paeth4_mmi; } #endif /* PNG_MIPS_MMI_IMPLEMENTATION > 0 */ MIPS_MSA_INIT: #if PNG_MIPS_MSA_IMPLEMENTATION == 1 /* The switch statement is compiled in for MIPS_MSA_API, the call to * png_have_msa is compiled in for MIPS_MSA_CHECK. If both are defined * the check is only performed if the API has not set the MSA option on * or off explicitly. In this case the check controls what happens. */ #ifdef PNG_MIPS_MSA_API_SUPPORTED switch ((pp->options >> PNG_MIPS_MSA) & 3) { case PNG_OPTION_UNSET: /* Allow the run-time check to execute if it has been enabled - * thus both API and CHECK can be turned on. If it isn't supported * this case will fall through to the 'default' below, which just * returns. */ #endif /* PNG_MIPS_MSA_API_SUPPORTED */ #ifdef PNG_MIPS_MSA_CHECK_SUPPORTED { static volatile sig_atomic_t no_msa = -1; /* not checked */ if (no_msa < 0) no_msa = !png_have_msa(pp); if (no_msa) return; } #ifdef PNG_MIPS_MSA_API_SUPPORTED break; #endif #endif /* PNG_MIPS_MSA_CHECK_SUPPORTED */ #ifdef PNG_MIPS_MSA_API_SUPPORTED default: /* OFF or INVALID */ return; case PNG_OPTION_ON: /* Option turned on */ break; } #endif /* IMPORTANT: any new external functions used here must be declared using * PNG_INTERNAL_FUNCTION in ../pngpriv.h. This is required so that the * 'prefix' option to configure works: * * ./configure --with-libpng-prefix=foobar_ * * Verify you have got this right by running the above command, doing a build * and examining pngprefix.h; it must contain a #define for every external * function you add. (Notice that this happens automatically for the * initialization function.) */ pp->read_filter[PNG_FILTER_VALUE_UP-1] = png_read_filter_row_up_msa; if (bpp == 3) { pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub3_msa; pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg3_msa; pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = png_read_filter_row_paeth3_msa; } else if (bpp == 4) { pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub4_msa; pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg4_msa; pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = png_read_filter_row_paeth4_msa; } #endif /* PNG_MIPS_MSA_IMPLEMENTATION == 1 */ return; } #endif /* PNG_MIPS_MSA_IMPLEMENTATION == 1 || PNG_MIPS_MMI_IMPLEMENTATION > 0 */ #endif /* READ */