 Jeffrey Bush
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1cfac269a8
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Finally fixed #4. The problem is that on Windows the stack is 4-byte aligned and GCC assumes (for some optimizations) 16-byte alignment. A GCC stack alignment fix was added to functions that needed it.
Also increased XPRESS Huffman max compressed size which helps #14.
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2015-03-19 20:52:50 -07:00 |
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Jeffrey Bush
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66e93e7581
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Fixing some warnings with gcc -Wextra -pedantic -Wuninitialized. The remaining warnings are mostly about variadic macros.
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2015-03-18 12:56:44 -07:00 |
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Jeffrey Bush
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e877ca5554
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Corrected XPRESS Huffman compression to max size and added checks to make sure it always stays under the max size. In addition many other changes were made for improved performance.
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2015-03-17 22:39:05 -07:00 |
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Jeffrey Bush
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3b3e29ed69
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Adding comment about bzip2 inspiration and removing sorting library.
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2015-03-13 18:32:35 -07:00 |
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Jeffrey Bush
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7b7ed8cbf4
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Completely changed the Huffman encoder to use an algorithm inspired by bzip2. This increases compression speed by more than 100%! That is its twice as fast! Downside is that compression ratio is slightly worse (but just barely: 32.792% to 32.853% or 167kb in 269MB). It also uses less stack (total 17kb).
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2015-03-13 18:25:24 -07:00 |
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Jeffrey Bush
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345d9752b4
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Improved the package-merge algorithm on the Huffman Encoder to use stack memory (its a lot of it - 519 kb now!). This improves its speed quite a bit (compression speed increases by 25%).
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2015-03-13 18:20:07 -07:00 |
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Jeffrey Bush
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32a8ce209b
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Found which loop was causing the access violation with GCC tree-vectorization and put it into the source so tree-vectorization is not disabled globally. Also improved Huffman encoder slightly, mainly by changing merge sort to use insertion sort when "small".
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2015-03-11 20:01:04 -07:00 |
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Jeffrey Bush
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62e73cc836
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Reorganized code some more to allow it to be easier to bundle into other libraries and fixed some includes.
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2015-02-12 12:29:53 -08:00 |
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