Update libjpeg_turbo to 1.4.90 from https://github.com/libjpeg-turbo/

simd/jsimd_mips.c

+/*
+ * jsimd_mips.c
+ *
+ * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
+ * Copyright 2009-2011, 2014 D. R. Commander
+ * Copyright (C) 2013-2014, MIPS Technologies, Inc., California
+ * Copyright 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;
+}