text: /*
   * jsimd_mips.c
   *
   * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
   * Copyright (C) 2009-2011, 2014, D. R. Commander.
   * Copyright (C) 2013-2014, MIPS Technologies, Inc., California.
   * Copyright (C) 2015, Matthieu Darbois.
   *
   * Based on the x86 SIMD extension for IJG JPEG library,
   * Copyright (C) 1999-2006, MIYASAKA Masaru.
   * For conditions of distribution and use, see copyright notice in jsimdext.inc
   *
   * This file contains the interface between the "normal" portions
   * of the library and the SIMD implementations when running on a
   * MIPS architecture.
   */
  
  #define JPEG_INTERNALS
  #include "../jinclude.h"
  #include "../jpeglib.h"
  #include "../jsimd.h"
  #include "../jdct.h"
  #include "../jsimddct.h"
  #include "jsimd.h"
  
  #include <stdio.h>
  #include <string.h>
  #include <ctype.h>
  
  static unsigned int simd_support = ~0;
  
  #if defined(__linux__)
  
  LOCAL(int)
  parse_proc_cpuinfo(const char* search_string)
  {
    const char* file_name = "/proc/cpuinfo";
    char cpuinfo_line[256];
    FILE* f = NULL;
    simd_support = 0;
  
    if ((f = fopen(file_name, "r")) != NULL) {
      while (fgets(cpuinfo_line, sizeof(cpuinfo_line), f) != NULL) {
        if (strstr(cpuinfo_line, search_string) != NULL) {
          fclose(f);
          simd_support |= JSIMD_MIPS_DSPR2;
          return 1;
        }
      }
      fclose(f);
    }
    /* Did not find string in the proc file, or not Linux ELF. */
    return 0;
  }
  
  #endif
  
  /*
   * Check what SIMD accelerations are supported.
   *
   * FIXME: This code is racy under a multi-threaded environment.
   */
  LOCAL(void)
  init_simd (void)
  {
    if (simd_support != ~0U)
      return;
  
    simd_support = 0;
  
  #if defined(__MIPSEL__) && defined(__mips_dsp) && (__mips_dsp_rev >= 2)
    simd_support |= JSIMD_MIPS_DSPR2;
  #elif defined(__linux__)
    /* We still have a chance to use MIPS DSPR2 regardless of globally used
     * -mdspr2 options passed to gcc by performing runtime detection via
     * /proc/cpuinfo parsing on linux */
    if (!parse_proc_cpuinfo("MIPS 74K"))
      return;
  #endif
  }
  
  static const int mips_idct_ifast_coefs[4] = {
    0x45404540,           // FIX( 1.082392200 / 2) =  17734 = 0x4546
    0x5A805A80,           // FIX( 1.414213562 / 2) =  23170 = 0x5A82
    0x76407640,           // FIX( 1.847759065 / 2) =  30274 = 0x7642
    0xAC60AC60            // FIX(-2.613125930 / 4) = -21407 = 0xAC61
  };
  
  /* The following struct is borrowed from jdsample.c */
  typedef void (*upsample1_ptr) (j_decompress_ptr cinfo,
                                 jpeg_component_info *compptr,
                                 JSAMPARRAY input_data,
                                 JSAMPARRAY *output_data_ptr);
  
  typedef struct {
    struct jpeg_upsampler pub;
    JSAMPARRAY color_buf[MAX_COMPONENTS];
    upsample1_ptr methods[MAX_COMPONENTS];
    int next_row_out;
    JDIMENSION rows_to_go;
    int rowgroup_height[MAX_COMPONENTS];
    UINT8 h_expand[MAX_COMPONENTS];
    UINT8 v_expand[MAX_COMPONENTS];
  } my_upsampler;
  
  typedef my_upsampler *my_upsample_ptr;
  
  GLOBAL(int)
  jsimd_can_rgb_ycc (void)
  {
    init_simd();
  
    /* The code is optimised for these values only */
    if (BITS_IN_JSAMPLE != 8)
      return 0;
    if (sizeof(JDIMENSION) != 4)
      return 0;
    if ((RGB_PIXELSIZE != 3) && (RGB_PIXELSIZE != 4))
      return 0;
  
    if (simd_support & JSIMD_MIPS_DSPR2)
      return 1;
  
    return 0;
  }
  
  GLOBAL(int)
  jsimd_can_rgb_gray (void)
  {
    init_simd();
  
    /* The code is optimised for these values only */
    if (BITS_IN_JSAMPLE != 8)
      return 0;
    if (sizeof(JDIMENSION) != 4)
      return 0;
    if ((RGB_PIXELSIZE != 3) && (RGB_PIXELSIZE != 4))
      return 0;
  
    if (simd_support & JSIMD_MIPS_DSPR2)
      return 1;
  
    return 0;
  }
  
  GLOBAL(int)
  jsimd_can_ycc_rgb (void)
  {
    init_simd();
  
    /* The code is optimised for these values only */
    if (BITS_IN_JSAMPLE != 8)
      return 0;
    if (sizeof(JDIMENSION) != 4)
      return 0;
    if ((RGB_PIXELSIZE != 3) && (RGB_PIXELSIZE != 4))
      return 0;
  
    if (simd_support & JSIMD_MIPS_DSPR2)
      return 1;
  
    return 0;
  }
  
  GLOBAL(int)
  jsimd_can_ycc_rgb565 (void)
  {
    return 0;
  }
  
  GLOBAL(int)
  jsimd_c_can_null_convert (void)
  {
    init_simd();
  
    /* The code is optimised for these values only */
    if (BITS_IN_JSAMPLE != 8)
      return 0;
    if (sizeof(JDIMENSION) != 4)
      return 0;
  
    if (simd_support & JSIMD_MIPS_DSPR2)
      return 1;
  
    return 0;
  }
  
  GLOBAL(void)
  jsimd_rgb_ycc_convert (j_compress_ptr cinfo,
                         JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
                         JDIMENSION output_row, int num_rows)
  {
    void (*mipsdspr2fct)(JDIMENSION, JSAMPARRAY, JSAMPIMAGE, JDIMENSION, int);
  
    switch(cinfo->in_color_space) {
      case JCS_EXT_RGB:
        mipsdspr2fct=jsimd_extrgb_ycc_convert_mips_dspr2;
        break;
      case JCS_EXT_RGBX:
      case JCS_EXT_RGBA:
        mipsdspr2fct=jsimd_extrgbx_ycc_convert_mips_dspr2;
        break;
      case JCS_EXT_BGR:
        mipsdspr2fct=jsimd_extbgr_ycc_convert_mips_dspr2;
        break;
      case JCS_EXT_BGRX:
      case JCS_EXT_BGRA:
        mipsdspr2fct=jsimd_extbgrx_ycc_convert_mips_dspr2;
        break;
      case JCS_EXT_XBGR:
      case JCS_EXT_ABGR:
        mipsdspr2fct=jsimd_extxbgr_ycc_convert_mips_dspr2;
  
        break;
      case JCS_EXT_XRGB:
      case JCS_EXT_ARGB:
        mipsdspr2fct=jsimd_extxrgb_ycc_convert_mips_dspr2;
        break;
      default:
        mipsdspr2fct=jsimd_extrgb_ycc_convert_mips_dspr2;
        break;
    }
  
    if (simd_support & JSIMD_MIPS_DSPR2)
      mipsdspr2fct(cinfo->image_width, input_buf, output_buf, output_row,
                   num_rows);
  }
  
  GLOBAL(void)
  jsimd_rgb_gray_convert (j_compress_ptr cinfo,
                          JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
                          JDIMENSION output_row, int num_rows)
  {
    void (*mipsdspr2fct)(JDIMENSION, JSAMPARRAY, JSAMPIMAGE, JDIMENSION, int);
  
    switch(cinfo->in_color_space) {
      case JCS_EXT_RGB:
        mipsdspr2fct=jsimd_extrgb_gray_convert_mips_dspr2;
        break;
      case JCS_EXT_RGBX:
      case JCS_EXT_RGBA:
        mipsdspr2fct=jsimd_extrgbx_gray_convert_mips_dspr2;
        break;
      case JCS_EXT_BGR:
        mipsdspr2fct=jsimd_extbgr_gray_convert_mips_dspr2;
        break;
      case JCS_EXT_BGRX:
      case JCS_EXT_BGRA:
        mipsdspr2fct=jsimd_extbgrx_gray_convert_mips_dspr2;
        break;
      case JCS_EXT_XBGR:
      case JCS_EXT_ABGR:
        mipsdspr2fct=jsimd_extxbgr_gray_convert_mips_dspr2;
        break;
      case JCS_EXT_XRGB:
      case JCS_EXT_ARGB:
        mipsdspr2fct=jsimd_extxrgb_gray_convert_mips_dspr2;
        break;
      default:
        mipsdspr2fct=jsimd_extrgb_gray_convert_mips_dspr2;
        break;
    }
  
    if (simd_support & JSIMD_MIPS_DSPR2)
      mipsdspr2fct(cinfo->image_width, input_buf, output_buf, output_row,
                   num_rows);
  }
  
  GLOBAL(void)
  jsimd_ycc_rgb_convert (j_decompress_ptr cinfo,
                         JSAMPIMAGE input_buf, JDIMENSION input_row,
                         JSAMPARRAY output_buf, int num_rows)
  {
    void (*mipsdspr2fct)(JDIMENSION, JSAMPIMAGE, JDIMENSION, JSAMPARRAY, int);
  
    switch(cinfo->out_color_space) {
      case JCS_EXT_RGB:
        mipsdspr2fct=jsimd_ycc_extrgb_convert_mips_dspr2;
        break;
      case JCS_EXT_RGBX:
      case JCS_EXT_RGBA:
        mipsdspr2fct=jsimd_ycc_extrgbx_convert_mips_dspr2;
        break;
      case JCS_EXT_BGR:
        mipsdspr2fct=jsimd_ycc_extbgr_convert_mips_dspr2;
        break;
      case JCS_EXT_BGRX:
      case JCS_EXT_BGRA:
        mipsdspr2fct=jsimd_ycc_extbgrx_convert_mips_dspr2;
        break;
      case JCS_EXT_XBGR:
      case JCS_EXT_ABGR:
        mipsdspr2fct=jsimd_ycc_extxbgr_convert_mips_dspr2;
        break;
      case JCS_EXT_XRGB:
      case JCS_EXT_ARGB:
        mipsdspr2fct=jsimd_ycc_extxrgb_convert_mips_dspr2;
        break;
    default:
        mipsdspr2fct=jsimd_ycc_extrgb_convert_mips_dspr2;
        break;
    }
  
    if (simd_support & JSIMD_MIPS_DSPR2)
      mipsdspr2fct(cinfo->output_width, input_buf, input_row, output_buf,
                   num_rows);
  }
  
  GLOBAL(void)
  jsimd_ycc_rgb565_convert (j_decompress_ptr cinfo,
                            JSAMPIMAGE input_buf, JDIMENSION input_row,
                            JSAMPARRAY output_buf, int num_rows)
  {
  }
  
  GLOBAL(void)
  jsimd_c_null_convert (j_compress_ptr cinfo,
                        JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
                        JDIMENSION output_row, int num_rows)
  {
    if (simd_support & JSIMD_MIPS_DSPR2)
      jsimd_c_null_convert_mips_dspr2(cinfo->image_width, input_buf,
                                      output_buf, output_row, num_rows,
                                      cinfo->num_components);
  }
  
  GLOBAL(int)
  jsimd_can_h2v2_downsample (void)
  {
    init_simd();
  
    /* The code is optimised for these values only */
    if (BITS_IN_JSAMPLE != 8)
      return 0;
    if (sizeof(JDIMENSION) != 4)
      return 0;
  
    if (simd_support & JSIMD_MIPS_DSPR2)
      return 1;
  
    return 0;
  }
  
  GLOBAL(int)
  jsimd_can_h2v2_smooth_downsample (void)
  {
    init_simd();
  
    /* The code is optimised for these values only */
    if (BITS_IN_JSAMPLE != 8)
      return 0;
    if (sizeof(JDIMENSION) != 4)
      return 0;
    if(DCTSIZE != 8)
      return 0;
  
    if (simd_support & JSIMD_MIPS_DSPR2)
      return 1;
  
    return 0;
  }
  
  GLOBAL(int)
  jsimd_can_h2v1_downsample (void)
  {
    init_simd();
  
    /* The code is optimised for these values only */
    if (BITS_IN_JSAMPLE != 8)
      return 0;
    if (sizeof(JDIMENSION) != 4)
      return 0;
  
    if (simd_support & JSIMD_MIPS_DSPR2)
      return 1;
  
    return 0;
  }
  
  GLOBAL(void)
  jsimd_h2v2_downsample (j_compress_ptr cinfo, jpeg_component_info *compptr,
                         JSAMPARRAY input_data, JSAMPARRAY output_data)
  {
    if (simd_support & JSIMD_MIPS_DSPR2)
      jsimd_h2v2_downsample_mips_dspr2(cinfo->image_width,
                                       cinfo->max_v_samp_factor,
                                       compptr->v_samp_factor,
                                       compptr->width_in_blocks, input_data,
                                       output_data);
  }
  
  GLOBAL(void)
  jsimd_h2v2_smooth_downsample (j_compress_ptr cinfo,
                                jpeg_component_info *compptr,
                                JSAMPARRAY input_data, JSAMPARRAY output_data)
  {
    jsimd_h2v2_smooth_downsample_mips_dspr2(input_data, output_data,
                                            compptr->v_samp_factor,
                                            cinfo->max_v_samp_factor,
                                            cinfo->smoothing_factor,
                                            compptr->width_in_blocks,
                                            cinfo->image_width);
  }
  
  GLOBAL(void)
  jsimd_h2v1_downsample (j_compress_ptr cinfo, jpeg_component_info *compptr,
                         JSAMPARRAY input_data, JSAMPARRAY output_data)
  {
    if (simd_support & JSIMD_MIPS_DSPR2)
      jsimd_h2v1_downsample_mips_dspr2(cinfo->image_width,
                                       cinfo->max_v_samp_factor,
                                       compptr->v_samp_factor,
                                       compptr->width_in_blocks,
                                       input_data, output_data);
  }
  
  GLOBAL(int)
  jsimd_can_h2v2_upsample (void)
  {
    init_simd();
  
    /* The code is optimised for these values only */
    if (BITS_IN_JSAMPLE != 8)
      return 0;
    if (sizeof(JDIMENSION) != 4)
      return 0;
  
    if (simd_support & JSIMD_MIPS_DSPR2)
      return 1;
  
    return 0;
  }
  
  GLOBAL(int)
  jsimd_can_h2v1_upsample (void)
  {
    init_simd();
  
    /* The code is optimised for these values only */
    if (BITS_IN_JSAMPLE != 8)
      return 0;
    if (sizeof(JDIMENSION) != 4)
      return 0;
  
    if (simd_support & JSIMD_MIPS_DSPR2)
      return 1;
  
    return 0;
  }
  
  GLOBAL(int)
  jsimd_can_int_upsample (void)
  {
    init_simd();
  
    /* The code is optimised for these values only */
    if (BITS_IN_JSAMPLE != 8)
      return 0;
    if (sizeof(JDIMENSION) != 4)
      return 0;
  
    if (simd_support & JSIMD_MIPS_DSPR2)
      return 1;
  
    return 0;
  }
  
  GLOBAL(void)
  jsimd_h2v2_upsample (j_decompress_ptr cinfo,
                       jpeg_component_info *compptr,
                       JSAMPARRAY input_data,
                       JSAMPARRAY *output_data_ptr)
  {
    if (simd_support & JSIMD_MIPS_DSPR2)
      jsimd_h2v2_upsample_mips_dspr2(cinfo->max_v_samp_factor,
                                     cinfo->output_width, input_data,
                                     output_data_ptr);
  }
  
  GLOBAL(void)
  jsimd_h2v1_upsample (j_decompress_ptr cinfo,
                       jpeg_component_info *compptr,
                       JSAMPARRAY input_data,
                       JSAMPARRAY *output_data_ptr)
  {
    if (simd_support & JSIMD_MIPS_DSPR2)
      jsimd_h2v1_upsample_mips_dspr2(cinfo->max_v_samp_factor,
                                     cinfo->output_width, input_data,
                                     output_data_ptr);
  }
  
  GLOBAL(void)
  jsimd_int_upsample (j_decompress_ptr cinfo, jpeg_component_info *compptr,
                      JSAMPARRAY input_data, JSAMPARRAY *output_data_ptr)
  {
    my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
  
    jsimd_int_upsample_mips_dspr2(upsample->h_expand[compptr->component_index],
                                  upsample->v_expand[compptr->component_index],
                                  input_data, output_data_ptr,
                                  cinfo->output_width,
                                  cinfo->max_v_samp_factor);
  }
  
  GLOBAL(int)
  jsimd_can_h2v2_fancy_upsample (void)
  {
    init_simd();
  
    /* The code is optimised for these values only */
    if (BITS_IN_JSAMPLE != 8)
      return 0;
    if (sizeof(JDIMENSION) != 4)
      return 0;
  
    if (simd_support & JSIMD_MIPS_DSPR2)
      return 1;
  
    return 0;
  }
  
  GLOBAL(int)
  jsimd_can_h2v1_fancy_upsample (void)
  {
    init_simd();
  
    /* The code is optimised for these values only */
    if (BITS_IN_JSAMPLE != 8)
      return 0;
    if (sizeof(JDIMENSION) != 4)
      return 0;
  
    if (simd_support & JSIMD_MIPS_DSPR2)
      return 1;
  
    return 0;
  }
  
  GLOBAL(void)
  jsimd_h2v2_fancy_upsample (j_decompress_ptr cinfo,
                             jpeg_component_info *compptr,
                             JSAMPARRAY input_data,
                             JSAMPARRAY *output_data_ptr)
  {
    if (simd_support & JSIMD_MIPS_DSPR2)
      jsimd_h2v2_fancy_upsample_mips_dspr2(cinfo->max_v_samp_factor,
                                           compptr->downsampled_width,
                                           input_data, output_data_ptr);
  }
  
  GLOBAL(void)
  jsimd_h2v1_fancy_upsample (j_decompress_ptr cinfo,
                             jpeg_component_info *compptr,
                             JSAMPARRAY input_data,
                             JSAMPARRAY *output_data_ptr)
  {
    if (simd_support & JSIMD_MIPS_DSPR2)
      jsimd_h2v1_fancy_upsample_mips_dspr2(cinfo->max_v_samp_factor,
                                           compptr->downsampled_width,
                                           input_data, output_data_ptr);
  }
  
  GLOBAL(int)
  jsimd_can_h2v2_merged_upsample (void)
  {
    init_simd();
  
    if (BITS_IN_JSAMPLE != 8)
      return 0;
    if (sizeof(JDIMENSION) != 4)
      return 0;
  
    if (simd_support & JSIMD_MIPS_DSPR2)
      return 1;
  
    return 0;
  }
  
  GLOBAL(int)
  jsimd_can_h2v1_merged_upsample (void)
  {
    init_simd();
  
    if (BITS_IN_JSAMPLE != 8)
      return 0;
    if (sizeof(JDIMENSION) != 4)
      return 0;
  
    if (simd_support & JSIMD_MIPS_DSPR2)
      return 1;
  
    return 0;
  }
  
  GLOBAL(void)
  jsimd_h2v2_merged_upsample (j_decompress_ptr cinfo,
                              JSAMPIMAGE input_buf,
                              JDIMENSION in_row_group_ctr,
                              JSAMPARRAY output_buf)
  {
    void (*mipsdspr2fct)(JDIMENSION, JSAMPIMAGE, JDIMENSION, JSAMPARRAY,
                         JSAMPLE *);
  
    switch(cinfo->out_color_space) {
      case JCS_EXT_RGB:
        mipsdspr2fct=jsimd_h2v2_extrgb_merged_upsample_mips_dspr2;
        break;
      case JCS_EXT_RGBX:
      case JCS_EXT_RGBA:
        mipsdspr2fct=jsimd_h2v2_extrgbx_merged_upsample_mips_dspr2;
        break;
      case JCS_EXT_BGR:
        mipsdspr2fct=jsimd_h2v2_extbgr_merged_upsample_mips_dspr2;
        break;
      case JCS_EXT_BGRX:
      case JCS_EXT_BGRA:
        mipsdspr2fct=jsimd_h2v2_extbgrx_merged_upsample_mips_dspr2;
        break;
      case JCS_EXT_XBGR:
      case JCS_EXT_ABGR:
        mipsdspr2fct=jsimd_h2v2_extxbgr_merged_upsample_mips_dspr2;
        break;
      case JCS_EXT_XRGB:
      case JCS_EXT_ARGB:
        mipsdspr2fct=jsimd_h2v2_extxrgb_merged_upsample_mips_dspr2;
        break;
      default:
        mipsdspr2fct=jsimd_h2v2_extrgb_merged_upsample_mips_dspr2;
        break;
    }
  
    mipsdspr2fct(cinfo->output_width, input_buf, in_row_group_ctr, output_buf,
                 cinfo->sample_range_limit);
  }
  
  GLOBAL(void)
  jsimd_h2v1_merged_upsample (j_decompress_ptr cinfo,
                              JSAMPIMAGE input_buf,
                              JDIMENSION in_row_group_ctr,
                              JSAMPARRAY output_buf)
  {
    void (*mipsdspr2fct)(JDIMENSION, JSAMPIMAGE, JDIMENSION, JSAMPARRAY,
                         JSAMPLE *);
  
    switch(cinfo->out_color_space) {
      case JCS_EXT_RGB:
        mipsdspr2fct=jsimd_h2v1_extrgb_merged_upsample_mips_dspr2;
        break;
      case JCS_EXT_RGBX:
      case JCS_EXT_RGBA:
        mipsdspr2fct=jsimd_h2v1_extrgbx_merged_upsample_mips_dspr2;
        break;
      case JCS_EXT_BGR:
        mipsdspr2fct=jsimd_h2v1_extbgr_merged_upsample_mips_dspr2;
        break;
      case JCS_EXT_BGRX:
      case JCS_EXT_BGRA:
        mipsdspr2fct=jsimd_h2v1_extbgrx_merged_upsample_mips_dspr2;
        break;
      case JCS_EXT_XBGR:
      case JCS_EXT_ABGR:
        mipsdspr2fct=jsimd_h2v1_extxbgr_merged_upsample_mips_dspr2;
        break;
      case JCS_EXT_XRGB:
      case JCS_EXT_ARGB:
        mipsdspr2fct=jsimd_h2v1_extxrgb_merged_upsample_mips_dspr2;
        break;
      default:
        mipsdspr2fct=jsimd_h2v1_extrgb_merged_upsample_mips_dspr2;
        break;
    }
  
    mipsdspr2fct(cinfo->output_width, input_buf, in_row_group_ctr, output_buf,
                 cinfo->sample_range_limit);
  }
  
  GLOBAL(int)
  jsimd_can_convsamp (void)
  {
    init_simd();
  
    /* The code is optimised for these values only */
    if (DCTSIZE != 8)
      return 0;
    if (BITS_IN_JSAMPLE != 8)
      return 0;
    if (sizeof(JDIMENSION) != 4)
      return 0;
    if (sizeof(DCTELEM) != 2)
      return 0;
  
    if (simd_support & JSIMD_MIPS_DSPR2)
      return 1;
  
    return 0;
  }
  
  GLOBAL(int)
  jsimd_can_convsamp_float (void)
  {
    init_simd();
  
    /* The code is optimised for these values only */
    if (DCTSIZE != 8)
      return 0;
    if (sizeof(JCOEF) != 2)
      return 0;
    if (BITS_IN_JSAMPLE != 8)
      return 0;
    if (sizeof(JDIMENSION) != 4)
      return 0;
    if (sizeof(ISLOW_MULT_TYPE) != 2)
      return 0;
  
    if (simd_support & JSIMD_MIPS_DSPR2)
      return 1;
  
    return 0;
  }
  
  GLOBAL(void)
  jsimd_convsamp (JSAMPARRAY sample_data, JDIMENSION start_col,
                  DCTELEM *workspace)
  {
    if (simd_support & JSIMD_MIPS_DSPR2)
      jsimd_convsamp_mips_dspr2(sample_data, start_col, workspace);
  }
  
  GLOBAL(void)
  jsimd_convsamp_float (JSAMPARRAY sample_data, JDIMENSION start_col,
                        FAST_FLOAT *workspace)
  {
    if ((simd_support & JSIMD_MIPS_DSPR2))
      jsimd_convsamp_float_mips_dspr2(sample_data, start_col, workspace);
  }
  
  GLOBAL(int)
  jsimd_can_fdct_islow (void)
  {
    init_simd();
  
    /* The code is optimised for these values only */
    if (DCTSIZE != 8)
      return 0;
    if (sizeof(DCTELEM) != 2)
      return 0;
  
    if (simd_support & JSIMD_MIPS_DSPR2)
      return 1;
  
    return 0;
  }
  
  GLOBAL(int)
  jsimd_can_fdct_ifast (void)
  {
    init_simd();
  
    /* The code is optimised for these values only */
    if (DCTSIZE != 8)
      return 0;
    if (sizeof(DCTELEM) != 2)
      return 0;
  
    if (simd_support & JSIMD_MIPS_DSPR2)
      return 1;
  
    return 0;
  }
  
  GLOBAL(int)
  jsimd_can_fdct_float (void)
  {
    init_simd();
  
    return 0;
  }
  
  GLOBAL(void)
  jsimd_fdct_islow (DCTELEM *data)
  {
    if (simd_support & JSIMD_MIPS_DSPR2)
      jsimd_fdct_islow_mips_dspr2(data);
  }
  
  GLOBAL(void)
  jsimd_fdct_ifast (DCTELEM *data)
  {
    if (simd_support & JSIMD_MIPS_DSPR2)
      jsimd_fdct_ifast_mips_dspr2(data);
  }
  
  GLOBAL(void)
  jsimd_fdct_float (FAST_FLOAT *data)
  {
  }
  
  GLOBAL(int)
  jsimd_can_quantize (void)
  {
    init_simd();
  
    /* The code is optimised for these values only */
    if (DCTSIZE != 8)
      return 0;
    if (sizeof(JCOEF) != 2)
      return 0;
    if (sizeof(DCTELEM) != 2)
      return 0;
  
    if (simd_support & JSIMD_MIPS_DSPR2)
      return 1;
  
    return 0;
  }
  
  GLOBAL(int)
  jsimd_can_quantize_float (void)
  {
    init_simd();
  
    /* The code is optimised for these values only */
    if (DCTSIZE != 8)
      return 0;
    if (sizeof(JCOEF) != 2)
      return 0;
    if (BITS_IN_JSAMPLE != 8)
      return 0;
    if (sizeof(JDIMENSION) != 4)
      return 0;
    if (sizeof(ISLOW_MULT_TYPE) != 2)
      return 0;
  
    if (simd_support & JSIMD_MIPS_DSPR2)
      return 1;
  
    return 0;
  }
  
  GLOBAL(void)
  jsimd_quantize (JCOEFPTR coef_block, DCTELEM *divisors,
                  DCTELEM *workspace)
  {
    if (simd_support & JSIMD_MIPS_DSPR2)
      jsimd_quantize_mips_dspr2(coef_block, divisors, workspace);
  }
  
  GLOBAL(void)
  jsimd_quantize_float (JCOEFPTR coef_block, FAST_FLOAT *divisors,
                        FAST_FLOAT *workspace)
  {
    if (simd_support & JSIMD_MIPS_DSPR2)
      jsimd_quantize_float_mips_dspr2(coef_block, divisors, workspace);
  }
  
  GLOBAL(int)
  jsimd_can_idct_2x2 (void)
  {
    init_simd();
  
    /* The code is optimised for these values only */
    if (DCTSIZE != 8)
      return 0;
    if (sizeof(JCOEF) != 2)
      return 0;
    if (BITS_IN_JSAMPLE != 8)
      return 0;
    if (sizeof(JDIMENSION) != 4)
      return 0;
    if (sizeof(ISLOW_MULT_TYPE) != 2)
      return 0;
  
    if (simd_support & JSIMD_MIPS_DSPR2)
      return 1;
  
    return 0;
  }
  
  GLOBAL(int)
  jsimd_can_idct_4x4 (void)
  {
    init_simd();
  
    /* The code is optimised for these values only */
    if (DCTSIZE != 8)
      return 0;
    if (sizeof(JCOEF) != 2)
      return 0;
    if (BITS_IN_JSAMPLE != 8)
      return 0;
    if (sizeof(JDIMENSION) != 4)
      return 0;
    if (sizeof(ISLOW_MULT_TYPE) != 2)
      return 0;
  
    if (simd_support & JSIMD_MIPS_DSPR2)
      return 1;
  
    return 0;
  }
  
  GLOBAL(int)
  jsimd_can_idct_6x6 (void)
  {
    init_simd();
  
    /* The code is optimised for these values only */
    if (DCTSIZE != 8)
      return 0;
    if (sizeof(JCOEF) != 2)
      return 0;
    if (BITS_IN_JSAMPLE != 8)
      return 0;
    if (sizeof(JDIMENSION) != 4)
      return 0;
    if (sizeof(ISLOW_MULT_TYPE) != 2)
      return 0;
  
    if (simd_support & JSIMD_MIPS_DSPR2)
      return 1;
  
    return 0;
  }
  
  GLOBAL(int)
  jsimd_can_idct_12x12 (void)
  {
    init_simd();
  
    if (BITS_IN_JSAMPLE != 8)
      return 0;
    if (DCTSIZE != 8)
      return 0;
    if (sizeof(JCOEF) != 2)
      return 0;
    if (sizeof(JDIMENSION) != 4)
      return 0;
    if (sizeof(ISLOW_MULT_TYPE) != 2)
      return 0;
  
    if (simd_support & JSIMD_MIPS_DSPR2)
      return 1;
  
    return 0;
  }
  
  GLOBAL(void)
  jsimd_idct_2x2 (j_decompress_ptr cinfo, jpeg_component_info *compptr,
                  JCOEFPTR coef_block, JSAMPARRAY output_buf,
                  JDIMENSION output_col)
  {
    if (simd_support & JSIMD_MIPS_DSPR2)
      jsimd_idct_2x2_mips_dspr2(compptr->dct_table, coef_block, output_buf,
                                output_col);
  }
  
  GLOBAL(void)
  jsimd_idct_4x4 (j_decompress_ptr cinfo, jpeg_component_info *compptr,
                  JCOEFPTR coef_block, JSAMPARRAY output_buf,
                  JDIMENSION output_col)
  {
    if (simd_support & JSIMD_MIPS_DSPR2) {
      int workspace[DCTSIZE*4];  /* buffers data between passes */
      jsimd_idct_4x4_mips_dspr2(compptr->dct_table, coef_block, output_buf,
                                output_col, workspace);
    }
  }
  
  GLOBAL(void)
  jsimd_idct_6x6 (j_decompress_ptr cinfo, jpeg_component_info *compptr,
             JCOEFPTR coef_block, JSAMPARRAY output_buf,
             JDIMENSION output_col)
  {
      if (simd_support & JSIMD_MIPS_DSPR2)
        jsimd_idct_6x6_mips_dspr2(compptr->dct_table, coef_block, output_buf,
                                  output_col);
  }
  
  GLOBAL(void)
  jsimd_idct_12x12 (j_decompress_ptr cinfo, jpeg_component_info *compptr,
                    JCOEFPTR coef_block,
                    JSAMPARRAY output_buf, JDIMENSION output_col)
  {
    if (simd_support & JSIMD_MIPS_DSPR2) {
      int workspace[96];
      int output[12] = {
        (int)(output_buf[0] + output_col),
        (int)(output_buf[1] + output_col),
        (int)(output_buf[2] + output_col),
        (int)(output_buf[3] + output_col),
        (int)(output_buf[4] + output_col),
        (int)(output_buf[5] + output_col),
        (int)(output_buf[6] + output_col),
        (int)(output_buf[7] + output_col),
        (int)(output_buf[8] + output_col),
        (int)(output_buf[9] + output_col),
        (int)(output_buf[10] + output_col),
        (int)(output_buf[11] + output_col),
      };
      jsimd_idct_12x12_pass1_mips_dspr2(coef_block, compptr->dct_table,
                                        workspace);
      jsimd_idct_12x12_pass2_mips_dspr2(workspace, output);
    }
  }
  
  GLOBAL(int)
  jsimd_can_idct_islow (void)
  {
    init_simd();
  
    /* The code is optimised for these values only */
    if (DCTSIZE != 8)
      return 0;
    if (sizeof(JCOEF) != 2)
      return 0;
    if (BITS_IN_JSAMPLE != 8)
      return 0;
    if (sizeof(JDIMENSION) != 4)
      return 0;
    if (sizeof(ISLOW_MULT_TYPE) != 2)
      return 0;
  
    if (simd_support & JSIMD_MIPS_DSPR2)
      return 1;
  
    return 0;
  }
  
  GLOBAL(int)
  jsimd_can_idct_ifast (void)
  {
    init_simd();
  
    /* The code is optimised for these values only */
    if (DCTSIZE != 8)
      return 0;
    if (sizeof(JCOEF) != 2)
      return 0;
    if (BITS_IN_JSAMPLE != 8)
      return 0;
    if (sizeof(JDIMENSION) != 4)
      return 0;
    if (sizeof(IFAST_MULT_TYPE) != 2)
      return 0;
    if (IFAST_SCALE_BITS != 2)
      return 0;
  
    if (simd_support & JSIMD_MIPS_DSPR2)
      return 1;
  
    return 0;
  }
  
  GLOBAL(int)
  jsimd_can_idct_float (void)
  {
    init_simd();
  
    return 0;
  }
  
  GLOBAL(void)
  jsimd_idct_islow (j_decompress_ptr cinfo, jpeg_component_info *compptr,
                    JCOEFPTR coef_block, JSAMPARRAY output_buf,
                    JDIMENSION output_col)
  {
    if (simd_support & JSIMD_MIPS_DSPR2) {
      int output[8] = {
        (int)(output_buf[0] + output_col),
        (int)(output_buf[1] + output_col),
        (int)(output_buf[2] + output_col),
        (int)(output_buf[3] + output_col),
        (int)(output_buf[4] + output_col),
        (int)(output_buf[5] + output_col),
        (int)(output_buf[6] + output_col),
        (int)(output_buf[7] + output_col),
      };
  
      jsimd_idct_islow_mips_dspr2(coef_block, compptr->dct_table,
                                  output, IDCT_range_limit(cinfo));
    }
  }
  
  GLOBAL(void)
  jsimd_idct_ifast (j_decompress_ptr cinfo, jpeg_component_info *compptr,
                    JCOEFPTR coef_block, JSAMPARRAY output_buf,
                    JDIMENSION output_col)
  {
    if (simd_support & JSIMD_MIPS_DSPR2) {
      JCOEFPTR inptr;
      IFAST_MULT_TYPE *quantptr;
      DCTELEM workspace[DCTSIZE2];  /* buffers data between passes */
  
      /* Pass 1: process columns from input, store into work array. */
  
      inptr = coef_block;
      quantptr = (IFAST_MULT_TYPE *) compptr->dct_table;
  
      jsimd_idct_ifast_cols_mips_dspr2(inptr, quantptr,
                                       workspace, mips_idct_ifast_coefs);
  
      /* Pass 2: process rows from work array, store into output array. */
      /* Note that we must descale the results by a factor of 8 == 2**3, */
      /* and also undo the PASS1_BITS scaling. */
  
      jsimd_idct_ifast_rows_mips_dspr2(workspace, output_buf,
                                       output_col, mips_idct_ifast_coefs);
    }
  }
  
  GLOBAL(void)
  jsimd_idct_float (j_decompress_ptr cinfo, jpeg_component_info *compptr,
                    JCOEFPTR coef_block, JSAMPARRAY output_buf,
                    JDIMENSION output_col)
  {
  }
  
  GLOBAL(int)
  jsimd_can_huff_encode_one_block (void)
  {
    return 0;
  }
  
  GLOBAL(JOCTET*)
  jsimd_huff_encode_one_block (void *state, JOCTET *buffer, JCOEFPTR block,
                               int last_dc_val, c_derived_tbl *dctbl,
                               c_derived_tbl *actbl)
  {
    return NULL;
  }
  