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Subject: [boost] [GSoC 2019] cpp_int Improvement
From: Fenil Mehta (fenilgmehta_at_[hidden])
Date: 2019-02-19 18:32:33


Integers with the capability to store large numbers has always been a
requirement in C++ which has successfully been implemented by
boost/multiprecision/cpp_int. Other languages such as Python and Java also
supports such integer datatypes.

I performed a speed test for C++ and python integers. While comparing speed
of cpp_int and python int, I noticed that even though C++ source program
was compiled with -O2 and -O3 flags, cpp_int was slow as compared for
python int for multiplication and left-shift operations. The time taken for
multiplication was:
1) cpp_int = 17.06 seconds
2) python int = 8.39 seconds

I used the attached files to perform the testing on Linux. The execution
time was measured using the time command.

I would like to optimize this library. Being a GSoC aspirant, I was looking
to pair up with a potential mentor in this domain who could guide me. Any
feedback would be appreciated.

Fenil Mehta

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