kc3-lang/libjpeg-turbo/jconfigint.h.in

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• Hash : 16bd9845
  Author :
  Date : 2018-03-02T22:33:19
  

  C/SSE2 optimization of encode_mcu_AC_refine()
  
  This commit adds C and SSE2 optimizations for the encode_mcu_AC_refine()
  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@3c54642 using
  `time ./jpegtran -outfile /dev/null -progressive -optimise -copy none print_poster_0025.jpg`
  
  C
  clang x86_64: +7%
  gcc-5 x86_64: +30%
  gcc-7 x86_64: +33%
  clang i386: +0%
  gcc-5 i386: +24%
  gcc-7 i386: +23%
  
  SSE2
  clang x86_64: +42%
  gcc-5 x86_64: +53%
  gcc-7 x86_64: +64%
  clang i386: +35%
  gcc-5 i386: +46%
  gcc-7 i386: +49%
  
  Discussion in libjpeg-turbo/libjpeg-turbo#46
  

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• jconfigint.h.in

• /* libjpeg-turbo build number */
  #define BUILD  "@BUILD@"
  
  /* Compiler's inline keyword */
  #undef inline
  
  /* How to obtain function inlining. */
  #define INLINE  @INLINE@
  
  /* Define to the full name of this package. */
  #define PACKAGE_NAME  "@CMAKE_PROJECT_NAME@"
  
  /* Version number of package */
  #define VERSION  "@VERSION@"
  
  /* The size of `size_t', as computed by sizeof. */
  #define SIZEOF_SIZE_T  @SIZE_T@
  
  /* Define if your compiler has __builtin_ctzl() and sizeof(unsigned long) == sizeof(size_t). */
  #cmakedefine HAVE_BUILTIN_CTZL
  
  /* Define to 1 if you have the <intrin.h> header file. */
  #cmakedefine HAVE_INTRIN_H
  
  #if defined(_MSC_VER) && defined(HAVE_INTRIN_H)
  #if (SIZEOF_SIZE_T == 8)
  #define HAVE_BITSCANFORWARD64
  #elif (SIZEOF_SIZE_T == 4)
  #define HAVE_BITSCANFORWARD
  #endif
  #endif
  

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