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127 lines
4.3 KiB
C
127 lines
4.3 KiB
C
/* riscv_init.c - RISC-V Vector optimized filter functions
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*
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* Copyright (c) 2023 Google LLC
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* Written by Dragoș Tiselice <dtiselice@google.com>, May 2023.
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* Filip Wasil <f.wasil@samsung.com>, March 2025.
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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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#include "../pngpriv.h"
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#ifdef PNG_READ_SUPPORTED
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#if PNG_RISCV_RVV_OPT > 0
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#include <riscv_vector.h>
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#ifdef PNG_RISCV_RVV_CHECK_SUPPORTED /* Do run-time checks */
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/* WARNING: it is strongly recommended that you do not build libpng with
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* run-time checks for CPU features if at all possible. In the case of the
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* RISC-V Vector instructions there is no processor-specific way of detecting
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* the presence of the required support, therefore run-time detection is
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* extremely OS specific.
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*
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* You may set the macro PNG_RISCV_RVV_FILE to the file name of file containing
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* a fragment of C source code which defines the png_have_rvv function. There
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* are a number of implementations in contrib/riscv-rvv, but the only one that
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* has partial support is contrib/riscv-rvv/linux.c - a generic Linux
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* implementation which reads /proc/cpuinfo.
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*/
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#include <signal.h>
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#ifndef PNG_RISCV_RVV_FILE
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# if defined(__linux__)
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# define PNG_RISCV_RVV_FILE "contrib/riscv-rvv/linux.c"
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# else
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# error "No support for run-time RISC-V Vector checking; use compile-time options"
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# endif
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#endif
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static int png_have_rvv(png_structp png_ptr);
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#ifdef PNG_RISCV_RVV_FILE
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# include PNG_RISCV_RVV_FILE
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#endif
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#endif /* PNG_RISCV_RVV_CHECK_SUPPORTED */
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#ifndef PNG_ALIGNED_MEMORY_SUPPORTED
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# error "ALIGNED_MEMORY is required; set: -DPNG_ALIGNED_MEMORY_SUPPORTED"
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#endif
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void
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png_init_filter_functions_rvv(png_structp pp, unsigned int bpp)
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{
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/* The switch statement is compiled in for RISCV_RVV_API, the call to
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* png_have_rvv is compiled in for RISCV_RVV_CHECK. If both are
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* defined the check is only performed if the API has not set the VECTOR
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* option on or off explicitly. In this case the check controls what
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* happens.
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*/
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png_debug(1, "in png_init_filter_functions_rvv");
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#ifdef PNG_RISCV_RVV_API_SUPPORTED
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switch ((pp->options >> PNG_RISCV_RVV) & 3)
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{
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case PNG_OPTION_UNSET:
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/* Allow the run-time check to execute if it has been enabled -
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* thus both API and CHECK can be turned on. If it isn't supported
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* this case will fall through to the 'default' below, which just
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* returns.
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*/
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#endif /* PNG_RISCV_RVV_API_SUPPORTED */
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#ifdef PNG_RISCV_RVV_CHECK_SUPPORTED
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{
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static volatile sig_atomic_t no_rvv = -1; /* not checked */
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if (no_rvv < 0)
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no_rvv = !png_have_rvv(pp);
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if (no_rvv)
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return;
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}
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#ifdef PNG_RISCV_RVV_API_SUPPORTED
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break;
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#endif
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#endif /* PNG_RISCV_RVV_CHECK_SUPPORTED */
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#ifdef PNG_RISCV_RVV_API_SUPPORTED
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default: /* OFF or INVALID */
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return;
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case PNG_OPTION_ON:
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/* Option turned on */
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break;
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}
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#endif /* PNG_RISCV_RVV_API_SUPPORTED */
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/* IMPORTANT: any new external functions used here must be declared using
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* PNG_INTERNAL_FUNCTION in ../pngpriv.h. This is required so that the
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* 'prefix' option to configure works:
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*
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* ./configure --with-libpng-prefix=foobar_
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*
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* Verify you have got this right by running the above command, doing a build
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* and examining pngprefix.h; it must contain a #define for every external
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* function you add. (Notice that this happens automatically for the
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* initialization function.)
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*/
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pp->read_filter[PNG_FILTER_VALUE_UP-1] = png_read_filter_row_up_rvv;
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if (bpp == 3)
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{
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pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg3_rvv;
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pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = png_read_filter_row_paeth3_rvv;
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pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub3_rvv;
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}
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else if (bpp == 4)
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{
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pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg4_rvv;
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pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = png_read_filter_row_paeth4_rvv;
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pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub4_rvv;
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}
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}
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#endif /* PNG_RISCV_RVV_OPT > 0 */
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#endif /* PNG_READ_SUPPORTED */
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