/*
 * jsimd_x86_64.c
 *
 * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
 * Copyright (C) 2009-2011, 2014, 2016, D. R. Commander.
 * 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
 * 64-bit x86 architecture.
 */

#define JPEG_INTERNALS

#include "../jinclude.h"
#include "../jpeglib.h"
#include "../jsimd.h"
#include "../jdct.h"
#include "../jsimddct.h"
#include "jsimd.h"

/*
 * In the PIC cases, we have no guarantee that constants will keep
 * their alignment. This macro allows us to verify it at runtime.
 */
#define IS_ALIGNED(ptr, order) (((size_t)ptr & ((1 << order) - 1)) == 0)

#define IS_ALIGNED_SSE(ptr) (IS_ALIGNED(ptr, 4)) /* 16 byte alignment */

static unsigned int simd_support = ~0;
static unsigned int simd_huffman = 1;

/*
 * Check what SIMD accelerations are supported.
 *
 * FIXME: This code is racy under a multi-threaded environment.
 */
LOCAL(void)
init_simd(void) {
	char *env = NULL;

	if (simd_support != ~0U)
		return;

	simd_support = JSIMD_SSE2 | JSIMD_SSE;

	/* Force different settings through environment variables */
	env = getenv("JSIMD_FORCENONE");
	if ((env != NULL) && (strcmp(env, "1") == 0))
		simd_support = 0;
	env = getenv("JSIMD_NOHUFFENC");
	if ((env != NULL) && (strcmp(env, "1") == 0))
		simd_huffman = 0;
}

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_SSE2) &&
	    IS_ALIGNED_SSE(jconst_rgb_ycc_convert_sse2))
		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_SSE2) &&
	    IS_ALIGNED_SSE(jconst_rgb_gray_convert_sse2))
		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_SSE2) &&
	    IS_ALIGNED_SSE(jconst_ycc_rgb_convert_sse2))
		return 1;

	return 0;
}

GLOBAL(int)
jsimd_can_ycc_rgb565(void) {
	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 (*sse2fct)(JDIMENSION, JSAMPARRAY, JSAMPIMAGE, JDIMENSION, int);

	switch (cinfo->in_color_space) {
		case JCS_EXT_RGB:
			sse2fct = jsimd_extrgb_ycc_convert_sse2;
			break;
		case JCS_EXT_RGBX:
		case JCS_EXT_RGBA:
			sse2fct = jsimd_extrgbx_ycc_convert_sse2;
			break;
		case JCS_EXT_BGR:
			sse2fct = jsimd_extbgr_ycc_convert_sse2;
			break;
		case JCS_EXT_BGRX:
		case JCS_EXT_BGRA:
			sse2fct = jsimd_extbgrx_ycc_convert_sse2;
			break;
		case JCS_EXT_XBGR:
		case JCS_EXT_ABGR:
			sse2fct = jsimd_extxbgr_ycc_convert_sse2;
			break;
		case JCS_EXT_XRGB:
		case JCS_EXT_ARGB:
			sse2fct = jsimd_extxrgb_ycc_convert_sse2;
			break;
		default:
			sse2fct = jsimd_rgb_ycc_convert_sse2;
			break;
	}

	sse2fct(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 (*sse2fct)(JDIMENSION, JSAMPARRAY, JSAMPIMAGE, JDIMENSION, int);

	switch (cinfo->in_color_space) {
		case JCS_EXT_RGB:
			sse2fct = jsimd_extrgb_gray_convert_sse2;
			break;
		case JCS_EXT_RGBX:
		case JCS_EXT_RGBA:
			sse2fct = jsimd_extrgbx_gray_convert_sse2;
			break;
		case JCS_EXT_BGR:
			sse2fct = jsimd_extbgr_gray_convert_sse2;
			break;
		case JCS_EXT_BGRX:
		case JCS_EXT_BGRA:
			sse2fct = jsimd_extbgrx_gray_convert_sse2;
			break;
		case JCS_EXT_XBGR:
		case JCS_EXT_ABGR:
			sse2fct = jsimd_extxbgr_gray_convert_sse2;
			break;
		case JCS_EXT_XRGB:
		case JCS_EXT_ARGB:
			sse2fct = jsimd_extxrgb_gray_convert_sse2;
			break;
		default:
			sse2fct = jsimd_rgb_gray_convert_sse2;
			break;
	}

	sse2fct(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 (*sse2fct)(JDIMENSION, JSAMPIMAGE, JDIMENSION, JSAMPARRAY, int);

	switch (cinfo->out_color_space) {
		case JCS_EXT_RGB:
			sse2fct = jsimd_ycc_extrgb_convert_sse2;
			break;
		case JCS_EXT_RGBX:
		case JCS_EXT_RGBA:
			sse2fct = jsimd_ycc_extrgbx_convert_sse2;
			break;
		case JCS_EXT_BGR:
			sse2fct = jsimd_ycc_extbgr_convert_sse2;
			break;
		case JCS_EXT_BGRX:
		case JCS_EXT_BGRA:
			sse2fct = jsimd_ycc_extbgrx_convert_sse2;
			break;
		case JCS_EXT_XBGR:
		case JCS_EXT_ABGR:
			sse2fct = jsimd_ycc_extxbgr_convert_sse2;
			break;
		case JCS_EXT_XRGB:
		case JCS_EXT_ARGB:
			sse2fct = jsimd_ycc_extxrgb_convert_sse2;
			break;
		default:
			sse2fct = jsimd_ycc_rgb_convert_sse2;
			break;
	}

	sse2fct(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(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_SSE2)
		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_SSE2)
		return 1;

	return 0;
}

GLOBAL(void)
jsimd_h2v2_downsample(j_compress_ptr cinfo, jpeg_component_info *compptr,
                      JSAMPARRAY input_data, JSAMPARRAY output_data) {
	jsimd_h2v2_downsample_sse2(cinfo->image_width, cinfo->max_v_samp_factor,
	                           compptr->v_samp_factor, compptr->width_in_blocks,
	                           input_data, output_data);
}

GLOBAL(void)
jsimd_h2v1_downsample(j_compress_ptr cinfo, jpeg_component_info *compptr,
                      JSAMPARRAY input_data, JSAMPARRAY output_data) {
	jsimd_h2v1_downsample_sse2(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_SSE2)
		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_SSE2)
		return 1;

	return 0;
}

GLOBAL(void)
jsimd_h2v2_upsample(j_decompress_ptr cinfo,
                    jpeg_component_info *compptr,
                    JSAMPARRAY input_data,
                    JSAMPARRAY *output_data_ptr) {
	jsimd_h2v2_upsample_sse2(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) {
	jsimd_h2v1_upsample_sse2(cinfo->max_v_samp_factor, cinfo->output_width,
	                         input_data, output_data_ptr);
}

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_SSE2) &&
	    IS_ALIGNED_SSE(jconst_fancy_upsample_sse2))
		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_SSE2) &&
	    IS_ALIGNED_SSE(jconst_fancy_upsample_sse2))
		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) {
	jsimd_h2v2_fancy_upsample_sse2(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) {
	jsimd_h2v1_fancy_upsample_sse2(cinfo->max_v_samp_factor,
	                               compptr->downsampled_width, input_data,
	                               output_data_ptr);
}

GLOBAL(int)
jsimd_can_h2v2_merged_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_SSE2) &&
	    IS_ALIGNED_SSE(jconst_merged_upsample_sse2))
		return 1;

	return 0;
}

GLOBAL(int)
jsimd_can_h2v1_merged_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_SSE2) &&
	    IS_ALIGNED_SSE(jconst_merged_upsample_sse2))
		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 (*sse2fct)(JDIMENSION, JSAMPIMAGE, JDIMENSION, JSAMPARRAY);

	switch (cinfo->out_color_space) {
		case JCS_EXT_RGB:
			sse2fct = jsimd_h2v2_extrgb_merged_upsample_sse2;
			break;
		case JCS_EXT_RGBX:
		case JCS_EXT_RGBA:
			sse2fct = jsimd_h2v2_extrgbx_merged_upsample_sse2;
			break;
		case JCS_EXT_BGR:
			sse2fct = jsimd_h2v2_extbgr_merged_upsample_sse2;
			break;
		case JCS_EXT_BGRX:
		case JCS_EXT_BGRA:
			sse2fct = jsimd_h2v2_extbgrx_merged_upsample_sse2;
			break;
		case JCS_EXT_XBGR:
		case JCS_EXT_ABGR:
			sse2fct = jsimd_h2v2_extxbgr_merged_upsample_sse2;
			break;
		case JCS_EXT_XRGB:
		case JCS_EXT_ARGB:
			sse2fct = jsimd_h2v2_extxrgb_merged_upsample_sse2;
			break;
		default:
			sse2fct = jsimd_h2v2_merged_upsample_sse2;
			break;
	}

	sse2fct(cinfo->output_width, input_buf, in_row_group_ctr, output_buf);
}

GLOBAL(void)
jsimd_h2v1_merged_upsample(j_decompress_ptr cinfo,
                           JSAMPIMAGE input_buf,
                           JDIMENSION in_row_group_ctr,
                           JSAMPARRAY output_buf) {
	void (*sse2fct)(JDIMENSION, JSAMPIMAGE, JDIMENSION, JSAMPARRAY);

	switch (cinfo->out_color_space) {
		case JCS_EXT_RGB:
			sse2fct = jsimd_h2v1_extrgb_merged_upsample_sse2;
			break;
		case JCS_EXT_RGBX:
		case JCS_EXT_RGBA:
			sse2fct = jsimd_h2v1_extrgbx_merged_upsample_sse2;
			break;
		case JCS_EXT_BGR:
			sse2fct = jsimd_h2v1_extbgr_merged_upsample_sse2;
			break;
		case JCS_EXT_BGRX:
		case JCS_EXT_BGRA:
			sse2fct = jsimd_h2v1_extbgrx_merged_upsample_sse2;
			break;
		case JCS_EXT_XBGR:
		case JCS_EXT_ABGR:
			sse2fct = jsimd_h2v1_extxbgr_merged_upsample_sse2;
			break;
		case JCS_EXT_XRGB:
		case JCS_EXT_ARGB:
			sse2fct = jsimd_h2v1_extxrgb_merged_upsample_sse2;
			break;
		default:
			sse2fct = jsimd_h2v1_merged_upsample_sse2;
			break;
	}

	sse2fct(cinfo->output_width, input_buf, in_row_group_ctr, output_buf);
}

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_SSE2)
		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 (BITS_IN_JSAMPLE != 8)
		return 0;
	if (sizeof(JDIMENSION) != 4)
		return 0;
	if (sizeof(FAST_FLOAT) != 4)
		return 0;

	if (simd_support & JSIMD_SSE2)
		return 1;

	return 0;
}

GLOBAL(void)
jsimd_convsamp(JSAMPARRAY sample_data, JDIMENSION start_col,
               DCTELEM *workspace) {
	jsimd_convsamp_sse2(sample_data, start_col, workspace);
}

GLOBAL(void)
jsimd_convsamp_float(JSAMPARRAY sample_data, JDIMENSION start_col,
                     FAST_FLOAT *workspace) {
	jsimd_convsamp_float_sse2(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_SSE2) && IS_ALIGNED_SSE(jconst_fdct_islow_sse2))
		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_SSE2) && IS_ALIGNED_SSE(jconst_fdct_ifast_sse2))
		return 1;

	return 0;
}

GLOBAL(int)
jsimd_can_fdct_float(void) {
	init_simd();

	/* The code is optimised for these values only */
	if (DCTSIZE != 8)
		return 0;
	if (sizeof(FAST_FLOAT) != 4)
		return 0;

	if ((simd_support & JSIMD_SSE) && IS_ALIGNED_SSE(jconst_fdct_float_sse))
		return 1;

	return 0;
}

GLOBAL(void)
jsimd_fdct_islow(DCTELEM *data) {
	jsimd_fdct_islow_sse2(data);
}

GLOBAL(void)
jsimd_fdct_ifast(DCTELEM *data) {
	jsimd_fdct_ifast_sse2(data);
}

GLOBAL(void)
jsimd_fdct_float(FAST_FLOAT *data) {
	jsimd_fdct_float_sse(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_SSE2)
		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 (sizeof(FAST_FLOAT) != 4)
		return 0;

	if (simd_support & JSIMD_SSE2)
		return 1;

	return 0;
}

GLOBAL(void)
jsimd_quantize(JCOEFPTR coef_block, DCTELEM *divisors,
               DCTELEM *workspace) {
	jsimd_quantize_sse2(coef_block, divisors, workspace);
}

GLOBAL(void)
jsimd_quantize_float(JCOEFPTR coef_block, FAST_FLOAT *divisors,
                     FAST_FLOAT *workspace) {
	jsimd_quantize_float_sse2(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_SSE2) && IS_ALIGNED_SSE(jconst_idct_red_sse2))
		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_SSE2) && IS_ALIGNED_SSE(jconst_idct_red_sse2))
		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) {
	jsimd_idct_2x2_sse2(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) {
	jsimd_idct_4x4_sse2(compptr->dct_table, coef_block, output_buf, output_col);
}

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_SSE2) && IS_ALIGNED_SSE(jconst_idct_islow_sse2))
		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_SSE2) && IS_ALIGNED_SSE(jconst_idct_ifast_sse2))
		return 1;

	return 0;
}

GLOBAL(int)
jsimd_can_idct_float(void) {
	init_simd();

	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(FAST_FLOAT) != 4)
		return 0;
	if (sizeof(FLOAT_MULT_TYPE) != 4)
		return 0;

	if ((simd_support & JSIMD_SSE2) && IS_ALIGNED_SSE(jconst_idct_float_sse2))
		return 1;

	return 0;
}

GLOBAL(void)
jsimd_idct_islow(j_decompress_ptr cinfo, jpeg_component_info *compptr,
                 JCOEFPTR coef_block, JSAMPARRAY output_buf,
                 JDIMENSION output_col) {
	jsimd_idct_islow_sse2(compptr->dct_table, coef_block, output_buf,
	                      output_col);
}

GLOBAL(void)
jsimd_idct_ifast(j_decompress_ptr cinfo, jpeg_component_info *compptr,
                 JCOEFPTR coef_block, JSAMPARRAY output_buf,
                 JDIMENSION output_col) {
	jsimd_idct_ifast_sse2(compptr->dct_table, coef_block, output_buf,
	                      output_col);
}

GLOBAL(void)
jsimd_idct_float(j_decompress_ptr cinfo, jpeg_component_info *compptr,
                 JCOEFPTR coef_block, JSAMPARRAY output_buf,
                 JDIMENSION output_col) {
	jsimd_idct_float_sse2(compptr->dct_table, coef_block, output_buf,
	                      output_col);
}

GLOBAL(int)
jsimd_can_huff_encode_one_block(void) {
	init_simd();

	if (DCTSIZE != 8)
		return 0;
	if (sizeof(JCOEF) != 2)
		return 0;

	if ((simd_support & JSIMD_SSE2) && simd_huffman &&
	    IS_ALIGNED_SSE(jconst_huff_encode_one_block))
		return 1;

	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 jsimd_huff_encode_one_block_sse2(state, buffer, block, last_dc_val,
	                                        dctbl, actbl);
}
