/*
 * 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;
}
