riscv_init.c - mozsearch

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/* riscv_init.c - RISC-V Vector optimized filter functions

 * Copyright (c) 2023 Google LLC

 * Written by Dragoș Tiselice <dtiselice@google.com>, May 2023.

 *            Filip Wasil     <f.wasil@samsung.com>, March 2025.

 * This code is released under the libpng license.

 * For conditions of distribution and use, see the disclaimer

 * and license in png.h

*/

#include "../pngpriv.h"

#ifdef PNG_READ_SUPPORTED

#if PNG_RISCV_RVV_OPT > 0

#include <riscv_vector.h>

#include <signal.h>

#ifndef PNG_RISCV_RVV_FILE

#  if defined(__linux__)

#    define PNG_RISCV_RVV_FILE "contrib/riscv-rvv/linux.c"

#  else

#    error "No support for run-time RISC-V Vector checking; use compile-time options"

#  endif

#endif

static int png_have_rvv();

#ifdef PNG_RISCV_RVV_FILE

#  include PNG_RISCV_RVV_FILE

#endif

#ifndef PNG_ALIGNED_MEMORY_SUPPORTED

#  error "ALIGNED_MEMORY is required; set: -DPNG_ALIGNED_MEMORY_SUPPORTED"

#endif

void

png_init_filter_functions_rvv(png_structp pp, unsigned int bpp)

   png_debug(1, "in png_init_filter_functions_rvv");

   static volatile sig_atomic_t no_rvv = -1; /* not checked */

   if (no_rvv < 0)

      no_rvv = !png_have_rvv();

   if (no_rvv)

      return;

   pp->read_filter[PNG_FILTER_VALUE_UP-1] = png_read_filter_row_up_rvv;

   if (bpp == 3)

      pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg3_rvv;

      pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = png_read_filter_row_paeth3_rvv;

      pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub3_rvv;

   else if (bpp == 4)

      pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg4_rvv;

      pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = png_read_filter_row_paeth4_rvv;

      pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub4_rvv;

#endif /* PNG_RISCV_RVV_OPT > 0 */

#endif /* PNG_READ_SUPPORTED */