bobsteagall / utf_utils Goto Github PK
View Code? Open in Web Editor NEWMy work on high-speed conversion of UTF-8 to UTF-32/UTF-16
License: University of Illinois/NCSA Open Source License
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tzlaine phoyd mattkretz akalsi87 aimoonchen 0017031 andersama externalrepositories ajunlonglive firedtoad andrewman2 linecodeutf_utils's Issues
Missing executable flag for shell scripts
The build instructions do not work on Linux systems because the .sh files are not executable. Something like chmod u+x *.sh would help.
Odd benchmark results for BH decoder
Comparing slides #122 and #125 from the CppCon PDF, it seems the BH decoder is almost twice as fast converting UTF-8 to UTF-16 than it is converting UTF-8 to UTF-32 for the english_wiki.txt test case. I can reproduce that locally, the numbers I get are as follows:
****** UTF-8 to UTF-32 Conversion ******
for file: 'english_wiki.txt'
UTF-8 to UTF-32 took 720 msec (360275/358131 units/points) (745 reps) (iconv)
UTF-8 to UTF-32 took 1641 msec (360275/358131 units/points) (745 reps) (llvm)
UTF-8 to UTF-32 took 1808 msec (360275/358131 units/points) (745 reps) (av)
UTF-8 to UTF-32 took 1484 msec (360275/358131 units/points) (745 reps) (std::codecvt)
UTF-8 to UTF-32 took 279 msec (360275/358131 units/points) (745 reps) (Boost.Text)
UTF-8 to UTF-32 took 748 msec (360275/358131 units/points) (745 reps) (hoehrmann)
UTF-8 to UTF-32 took 343 msec (360275/358131 units/points) (745 reps) (kewb-basic)
UTF-8 to UTF-32 took 180 msec (360275/358131 units/points) (745 reps) (kewb-fast)
UTF-8 to UTF-32 took 112 msec (360275/358131 units/points) (745 reps) (kewb-sse)
...
****** UTF-8 to UTF-16 Conversion ******
for file: 'english_wiki.txt'
UTF-8 to UTF-16 took 850 msec (360275/358137 units/units) (745 reps) (iconv)
UTF-8 to UTF-16 took 1397 msec (360275/358137 units/units) (745 reps) (llvm)
UTF-8 to UTF-16 took 1592 msec (360275/358137 units/units) (745 reps) (std::codecvt)
UTF-8 to UTF-16 took 836 msec (360275/358137 units/units) (745 reps) (Boost.Text)
UTF-8 to UTF-16 took 443 msec (360275/358137 units/units) (745 reps) (hoehrmann)
UTF-8 to UTF-16 took 360 msec (360275/358137 units/units) (745 reps) (kewb-basic)
UTF-8 to UTF-16 took 178 msec (360275/358137 units/units) (745 reps) (kewb-fast)
UTF-8 to UTF-16 took 62 msec (360275/358137 units/units) (745 reps) (kewb-sse)
Since conversion to UTF-16 is a lot more work than conversion to UTF-32, that is a rather odd result and apparently not explained by memory throughput differences (UTF-32 probably touches more bytes than UTF-16) as other decoders seem largely unaffected.
(My numbers are with GCC 5.4.0 on a bare metal Linux on an old i5 in power saving mode. Looks like the code now uses a much smaller repetition count than when you generated the data for the slides?)
Missing cstddef include in utf_utils.h
My gcc complains about a missing definition for ptrdiff_t in src/utf_utils.h. The code compiles when I include cstddef there.
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