Guru
Re: Qt5.7/C++ - Playing with 'auto' keyword and chrono - loop problem? - speed tests
Even more interesting. The Microsoft C++ implementation of STL iterators is definitely slower than the GCC version.
The const_iterator returns a const reference to the value stored in the vector. This guarantees to the compiler that the caller will not modify the value and thus might allow it to generate more optimized (i.e. faster) code than using the non-const iterator.
<=== The Great Pumpkin says ===>
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Intermediate user
Re: Qt5.7/C++ - Playing with 'auto' keyword and chrono - loop problem? - speed tests
Hello d_stranz,
OS - Windows 10 - 32 bit
g++ -v
gcc version 5.3.0 (i686-posix-dwarf-rev0, Built by MinGW-W64 project)
Regards
d_stranz (11th January 2017)
Guru
Re: Qt5.7/C++ - Playing with 'auto' keyword and chrono - loop problem? - speed tests
When I get some free time I will run your tests using MSVC++ in Visual Studio 2013 / Windows 10 x64 and post my findings. Good work here.
<=== The Great Pumpkin says ===>
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Intermediate user
Re: Qt5.7/C++ - Playing with 'auto' keyword and chrono - loop problem? - speed tests
Hello,
OS - Windows 7 - 32 Bit
Same machine - dual boot system
g++ -v
gcc version 5.3.0 (i686-posix-dwarf-rev0, Built by MinGW-W64 project)
vector
f0 took 150927 microseconds.
f6 took 158602 microseconds.
f1 took 135515 microseconds.
f2 took 160152 microseconds reverse.
f3 took 85401.3 microseconds.
f7 took 137652 microseconds.
array
f4 took 70551.1 microseconds.
f5 took 65513.5 microseconds reverse.
Regards
Guru
Re: Qt5.7/C++ - Playing with 'auto' keyword and chrono - loop problem? - speed tests
Can you please make a ZIP file of your current code and attach it to a reply? There is code scattered in various places in this post, and I would like to be sure to use the same thing you are using.
<=== The Great Pumpkin says ===>
Please use CODE tags when posting source code so it is more readable. Click "Go Advanced" and then the "#" icon to insert the tags. Paste your code between them.
Intermediate user
Re: Qt5.7/C++ - Playing with 'auto' keyword and chrono - loop problem? - speed tests
Hello,
Enclosed 'Tests.txt'
Regards
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