Find the problem and then optimize it away!

The open source project denoted below has a deficiency when the following types expression, parser and symbol_table are specialised to "float" type then the generated expression is evaluated.

[url removed, login to view]

It seems that the computations are occurring as if the type was "double". This is seen on both 32-bit and 64-bit systems using a wide variety of compilers and systems.

The objective, is to take the stock [url removed, login to view] compile it and note the results for both ExprTk and native expression evaluations using the double type.

Then to recompile the benchmark using the float type, run it and note the results (Native and ExprTk), and then make any changes necessary to the file [url removed, login to view] so as to improve the results seen in the benchmark.

The results seen in the benchmark are the indicators of success. The benchmark will be independently compiled with the changes and without and comparisons made, There is an expectation of demonstrable performance increase of at least 10-15% when using the float type.

The deliverable will undergo a final step of validation, using the benchmark suite denoted below (epsilon set to 1). It is expected that an increase in performance across the board for ExprTkFloat benchmark will be observed.

[url removed, login to view]

As such the outcome is very specific and unambiguous and payment will be made on any deliverable that matches ALL the criteria denoted and achieves the minimum increases as specified previously.


01. Any changes must only contain pure C++ syntax.

02. Only the [url removed, login to view] file must be changed, not other files in the project can be modified.

02. No compiler specific syntax/capabilities/functions/builtins etc are allowed.

03. Only C++03 version of the language is allowed (no C++11 or C++98)

04. Using the stock/unmodified makefile found in the project, ALL changes once applied must compile error and warning free.

05. The changes must compile as per [4] on at least 3 of the following compilers GCC4.3+,Clang3.1+,Intel9.0+,MSVC

06. For an MSVC compilation the option [4] is not possible, so a solution with W4 set will be enough.

07. The results must work successfully and consistently on at least the x86 and x86-64 platforms (other platforms welcome)

08. The results must work successfully and consistently on Linux (kernel 2.6+) and Win32 (WinXP+) and Win64

09. The stock version of exprtk_test must compile and run successfully (No errors) with the changes made to [url removed, login to view]

10. No 3rd party solutions, libraries or frameworks will be allowed. Only the standard C++ libraries will allowed.

11. All changes must be yours and yours alone, all rights to those changes will be handed over exclusively without further dependencies on any other entities.


01. Text file detailing each of the changes and why they were required and any other pertinent information, ALL the changes must be valid and none of them can be left unexplained.

02. In [1] there will also be a listing of the results from running the benchmark using the stock and use the patched versions of [url removed, login to view]

03. A patch from the stock version of [url removed, login to view] with the change as per[1] that will achieve the desired results

04. The patch must fix the underlying issue.

05. The deliverable MUST meet all the requirements set above and in the description and constraints sections.


01. There will be no hand holding, or further explanations as the requirements are very straight forward.

02. Bidders must know C++ extremely well and must code C++ on a regular basis (daily)

03. Bidders must know C++ templates and general metaprogramming techniques well and must be able to demonstrate their abilities (a github et al sample) before anything is awarded

04. Bidders must know how to use their compiler's tool chain to compile and link the projects mentioned above, as no assistance will be provided in this area

05. Bidders must know how to debug C++ code using debuggers such as GDB or the MS debugger, as no assistance will be provided in this area

06. Bidders must be the actual bidders, and cannot be proxied by others.

**** NOTE ****

Before bidding contact me directly and give a 2 sentence brief on how you plan on solving this problem. Any bidders that do not do this will not be considered, Any bidders posting comments such as the following or similar will be rejected outright:

1. "Yes I have the skills and I can do it"
2. "I'll do it quickly"
3. "I'm the best person for this job"

Beceriler: C++ Programlama, Yazılım Mimarisi

Daha fazlasını gör: yours-24, types of programming language, types of programming errors, types of it solutions, to find a solution, the source for linux information, the final results, systems programming language, syntax programming, syntax in programming, standard c types, pure programming language, pure fix, programming with cpp, programming syntax, programming language types, programming language syntax, programming language performance, programming expression, performance board, open source programming language, open source math software, math programming language, math programming, math in programming

İşveren Hakkında:
( 0 değerlendirme ) Not available at this time., Australia

Proje NO: #4461397

Bu iş için 10 freelancer ortalamada $482 teklif veriyor


Hi, I am C++ expert and can surely help you here, Thanks

in %bids___i_period_sub_35% gün içinde749%project_currencyDetails_sign_sub_37% %project_currencyDetails_code_sub_38%
(125 Değerlendirme)

please check your inbox. Thanks

in %bids___i_period_sub_35% gün içinde525%project_currencyDetails_sign_sub_37% %project_currencyDetails_code_sub_38%
(45 Değerlendirme)

I am very proficient in c, c++. I have 15 years c++ developing experience now, and I have worked for 5 years, please let expert help you.

in %bids___i_period_sub_35% gün içinde330%project_currencyDetails_sign_sub_37% %project_currencyDetails_code_sub_38%
(19 Değerlendirme)

I have good hand with this project. I already did that kinda project. check pm/

in %bids___i_period_sub_35% gün içinde231%project_currencyDetails_sign_sub_37% %project_currencyDetails_code_sub_38%
(3 Değerlendirme)

Hell, sir. I would love to work for you. Thank you very much.

in %bids___i_period_sub_35% gün içinde247%project_currencyDetails_sign_sub_37% %project_currencyDetails_code_sub_38%
(0 Değerlendirme)

Kia ora! [login to view URL] are a NZ based web and software design company who have seen you here on the freelance market and are really excited about working with you and treating you to the full service, professional ex Daha Fazla

in %bids___i_period_sub_35% gün içinde721%project_currencyDetails_sign_sub_37% %project_currencyDetails_code_sub_38%
(0 Değerlendirme)

I have experience working in Performance domain both at the hardware level and software level while working for AMD. I can help you get this done, I have dropped a private message to you as well. Regards, Jegan

in %bids___i_period_sub_35% gün içinde330%project_currencyDetails_sign_sub_37% %project_currencyDetails_code_sub_38%
(0 Değerlendirme)

Hello, I have had a thorough look at exprtk, did a full build, and I am ready to go should you accept my bid, more on the PM...

in %bids___i_period_sub_35% gün içinde577%project_currencyDetails_sign_sub_37% %project_currencyDetails_code_sub_38%
(0 Değerlendirme)

Hi, Veltrod Software services is a global software consulting company specialized in providing Mobile applications, Social media frameworks and eCommerce solutions. Leveraging best-in-class people, processes, and te Daha Fazla

in %bids___i_period_sub_35% gün içinde618%project_currencyDetails_sign_sub_37% %project_currencyDetails_code_sub_38%
(0 Değerlendirme)

I delveope a new programming language VirtualC+Lisp I can develope for parser .DLL or .EXE in delphi source and based on LISP and IA-tehnoloy.,.. How to use ? You see the move files.. I develope VlaxCompiler with t Daha Fazla

in %bids___i_period_sub_35% gün içinde495%project_currencyDetails_sign_sub_37% %project_currencyDetails_code_sub_38%
(1 Yorum)