kc3-lang/libjpeg-turbo/jsimd.h

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• Hash : 5b177b3c
  Author :
  Date : 2018-03-22T11:36:43
  

  C/SSE2 optimization of encode_mcu_AC_first()
  
  This commit adds C and SSE2 optimizations for the encode_mcu_AC_first()
  function used in progressive Huffman encoding.
  
  The image used for testing can be retrieved from this page:
  https://blog.cloudflare.com/doubling-the-speed-of-jpegtran
  
  All timings done on `Intel(R) Core(TM) i7-4870HQ CPU @ 2.50GHz`
  clang version is `Apple LLVM version 9.0.0 (clang-900.0.39.2)`
  gcc-5 version is `gcc-5 (Homebrew GCC 5.5.0) 5.5.0`
  gcc-7 version is `gcc-7 (Homebrew GCC 7.2.0) 7.2.0`
  
  Here are the results in comparison to libjpeg-turbo@293263c using
  `time ./jpegtran -outfile /dev/null -progressive -optimise -copy none print_poster_0025.jpg`
  
  C
  clang x86_64: +19%
  gcc-5 x86_64: +80%
  gcc-7 x86_64: +57%
  clang i386: +5%
  gcc-5 i386: +59%
  gcc-7 i386: +51%
  
  SSE2
  clang x86_64: +79%
  gcc-5 x86_64: +158%
  gcc-7 x86_64: +122%
  clang i386: +71%
  gcc-5 i386: +134%
  gcc-7 i386: +135%
  
  Discussion in libjpeg-turbo/libjpeg-turbo#46
  

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• jsimd.h

• /*
   * jsimd.h
   *
   * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
   * Copyright (C) 2011, 2014, D. R. Commander.
   * Copyright (C) 2015-2016, 2018, 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
   *
   */
  
  #include "jchuff.h"             /* Declarations shared with jcphuff.c */
  
  EXTERN(int) jsimd_can_rgb_ycc(void);
  EXTERN(int) jsimd_can_rgb_gray(void);
  EXTERN(int) jsimd_can_ycc_rgb(void);
  EXTERN(int) jsimd_can_ycc_rgb565(void);
  EXTERN(int) jsimd_c_can_null_convert(void);
  
  EXTERN(void) jsimd_rgb_ycc_convert(j_compress_ptr cinfo, JSAMPARRAY input_buf,
                                     JSAMPIMAGE output_buf,
                                     JDIMENSION output_row, int num_rows);
  EXTERN(void) jsimd_rgb_gray_convert(j_compress_ptr cinfo, JSAMPARRAY input_buf,
                                      JSAMPIMAGE output_buf,
                                      JDIMENSION output_row, int num_rows);
  EXTERN(void) jsimd_ycc_rgb_convert(j_decompress_ptr cinfo,
                                     JSAMPIMAGE input_buf, JDIMENSION input_row,
                                     JSAMPARRAY output_buf, int num_rows);
  EXTERN(void) jsimd_ycc_rgb565_convert(j_decompress_ptr cinfo,
                                        JSAMPIMAGE input_buf,
                                        JDIMENSION input_row,
                                        JSAMPARRAY output_buf, int num_rows);
  EXTERN(void) jsimd_c_null_convert(j_compress_ptr cinfo, JSAMPARRAY input_buf,
                                    JSAMPIMAGE output_buf, JDIMENSION output_row,
                                    int num_rows);
  
  EXTERN(int) jsimd_can_h2v2_downsample(void);
  EXTERN(int) jsimd_can_h2v1_downsample(void);
  
  EXTERN(void) jsimd_h2v2_downsample(j_compress_ptr cinfo,
                                     jpeg_component_info *compptr,
                                     JSAMPARRAY input_data,
                                     JSAMPARRAY output_data);
  
  EXTERN(int) jsimd_can_h2v2_smooth_downsample(void);
  
  EXTERN(void) jsimd_h2v2_smooth_downsample(j_compress_ptr cinfo,
                                            jpeg_component_info *compptr,
                                            JSAMPARRAY input_data,
                                            JSAMPARRAY output_data);
  
  EXTERN(void) jsimd_h2v1_downsample(j_compress_ptr cinfo,
                                     jpeg_component_info *compptr,
                                     JSAMPARRAY input_data,
                                     JSAMPARRAY output_data);
  
  EXTERN(int) jsimd_can_h2v2_upsample(void);
  EXTERN(int) jsimd_can_h2v1_upsample(void);
  EXTERN(int) jsimd_can_int_upsample(void);
  
  EXTERN(void) jsimd_h2v2_upsample(j_decompress_ptr cinfo,
                                   jpeg_component_info *compptr,
                                   JSAMPARRAY input_data,
                                   JSAMPARRAY *output_data_ptr);
  EXTERN(void) jsimd_h2v1_upsample(j_decompress_ptr cinfo,
                                   jpeg_component_info *compptr,
                                   JSAMPARRAY input_data,
                                   JSAMPARRAY *output_data_ptr);
  EXTERN(void) jsimd_int_upsample(j_decompress_ptr cinfo,
                                  jpeg_component_info *compptr,
                                  JSAMPARRAY input_data,
                                  JSAMPARRAY *output_data_ptr);
  
  EXTERN(int) jsimd_can_h2v2_fancy_upsample(void);
  EXTERN(int) jsimd_can_h2v1_fancy_upsample(void);
  
  EXTERN(void) jsimd_h2v2_fancy_upsample(j_decompress_ptr cinfo,
                                         jpeg_component_info *compptr,
                                         JSAMPARRAY input_data,
                                         JSAMPARRAY *output_data_ptr);
  EXTERN(void) jsimd_h2v1_fancy_upsample(j_decompress_ptr cinfo,
                                         jpeg_component_info *compptr,
                                         JSAMPARRAY input_data,
                                         JSAMPARRAY *output_data_ptr);
  
  EXTERN(int) jsimd_can_h2v2_merged_upsample(void);
  EXTERN(int) jsimd_can_h2v1_merged_upsample(void);
  
  EXTERN(void) jsimd_h2v2_merged_upsample(j_decompress_ptr cinfo,
                                          JSAMPIMAGE input_buf,
                                          JDIMENSION in_row_group_ctr,
                                          JSAMPARRAY output_buf);
  EXTERN(void) jsimd_h2v1_merged_upsample(j_decompress_ptr cinfo,
                                          JSAMPIMAGE input_buf,
                                          JDIMENSION in_row_group_ctr,
                                          JSAMPARRAY output_buf);
  
  EXTERN(int) jsimd_can_huff_encode_one_block(void);
  
  EXTERN(JOCTET *) jsimd_huff_encode_one_block(void *state, JOCTET *buffer,
                                               JCOEFPTR block, int last_dc_val,
                                               c_derived_tbl *dctbl,
                                               c_derived_tbl *actbl);
  
  EXTERN(int) jsimd_can_encode_mcu_AC_first_prepare(void);
  
  EXTERN(void) jsimd_encode_mcu_AC_first_prepare
    (const JCOEF *block, const int *jpeg_natural_order_start, int Sl, int Al,
     JCOEF *values, size_t *zerobits);
  
  EXTERN(int) jsimd_can_encode_mcu_AC_refine_prepare(void);
  
  EXTERN(int) jsimd_encode_mcu_AC_refine_prepare
    (const JCOEF *block, const int *jpeg_natural_order_start, int Sl, int Al,
     JCOEF *absvalues, size_t *bits);
  

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