Libfixmath: Difference between revisions

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{{Primary sources|date=January 2023}}

{{lowercase|title=libfixmath}}

{{Infobox software

| name = libfixmath

| developer = Ben Brewer (aka flatmush)

| latest_release_version = r64

| latest_release_date = {{Start date and age|2012|02|02}}

| programming language = [[C (programming language)|C99]]

| operating_system = [[Cross-platform software|Cross-platform]]

| genre = [[fixed-point arithmetic|fixed -point math library]]

| license = [[MIT License|MIT]]

| website = http://code.google.com/p/libfixmath

| status = active

}}

'''libfixmath''' is a [[platform independent|platform-independent]] [[fixed-point arithmetic|fixed point]] maths library aimed at developers wanting to perform fast non-integer maths on platforms lacking a (or with a low performance) [[Floating Point Unit|FPU]]. It offers developers a similar interface to the standard [[math.h]] functions for use on [[Q (number format)|Q16.16]] [[fixed-point arithmetic|fixed point]] numbers.

'''libfixmath''' is a [[cross-platform software|platform-independent]] [[fixed-point arithmetic|fixed-point]] math library aimed at developers wanting to perform fast non-integer math on platforms lacking a (or with a low performance) [[Floating Point Unit|FPU]]. It offers developers a similar interface to the standard [[math.h]] functions for use on [[Q (number format)|Q16.16]] [[fixed-point arithmetic|fixed-point]] numbers. libfixmath has no external dependencies other than [[stdint.h]] and a compiler which supports [[64-bit]] integer arithmetic (such as [[GNU Compiler Collection|GCC]]).<ref>{{cite web|url=httphttps://code.googlegithub.com/pPetteriAimonen/libfixmath|title=libfixmath Project Page|website=[[GitHub]] }}</ref>

Conditional compilation options exist to remove the requirement for a [[64-bit]] capable [[compiler]] as many compilers for [[Microcontroller|microcontrollersmicrocontroller]]s and [[Digital signal processor|DSPs]] do not support [[64-bit]] arithmetic.<ref>{{cite web|url=httphttps://code.google.com/p/libfixmath/issues/detail?id=4|title=64-bit Compiler Support Issues}}</ref>

==History==

'''libfixmath''' was originally developed by Ben Brewer (aka flatmush) and first released publicly as part of the [[Dingoo SDK]].<ref>{{cite web|url=httphttps://code.google.com/p/dingoo-sdk|title=Dingoo SDK Project Page}}</ref> It has since been used to implement a software [[3D graphics]] library called FGL.<ref>{{cite web|url=httphttps://code.google.com/p/fgl|title=FGL Flatmush/Fixed-Point Graphics Library Project Page}}</ref>

==Q16.16 Functionsfunctions==

'''libfixmath''' was originally developed by Ben Brewer (aka flatmush) and first released publicly as part of the [[Dingoo SDK]].<ref>{{cite web|url=http://code.google.com/p/dingoo-sdk|title=Dingoo SDK Project Page}}</ref> It has since been used to implement a software [[3D graphics]] library called FGL.<ref>{{cite web|url=http://code.google.com/p/fgl|title=FGL Flatmush/Fixed-Point Graphics Library Project Page}}</ref>

==Q16.16 Functions==

{|class="wikitable"

|-

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|}

==Other Functionsfunctions==

{|class="wikitable"

|-

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==Performance==

For the most intensive function ([[atan2]]) benchmark results show the following results:

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|[[ARM Cortex-M0]] || 26.3%

|-

|[[Marvell Technology Group|Marvell]] [[XScale|PXA270]] ([[ARM architecture|ARM]]) @ 312MHz312&nbsp;MHz || 58.45%

|-

|[[List of Intel Core 2 microprocessors|Intel T5500]] || 120%

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|[[Intel atom|Intel Atom N280]] || 141%

|}

Note: These results were calculated using fixtest with caching optimizations turned off.<ref>{{cite web|url=httphttps://code.google.com/p/libfixmath/downloads/detail?name=fixtest_r16.zip|title=fixtest Download Page}}</ref>

==Licensing==

'''libfixmath''' is released under the [[MIT License]], a [[permissive free software licence]], and is [[free software]].

==ExternalSee linksalso==

{{Portal|Free Software}}

* [[Binary scaling]]

* [http://code.google.com/p/libfixmath Project Page]

* [[Fixed-point arithmetic]]

* [http://groups.google.com/group/libfixmath Group Page/Mailing List]

* [[Floating-point arithmetic]]

* [[Q (number format)]]

==References==

{{Reflist}}

==External links==

* [https://github.com/PetteriAimonen/libfixmath Project Page]

* [http://codegroups.google.com/pgroup/libfixmath ProjectGroup Page/Mailing List]

[[Category:Numerical software]]

[[Category:C (programming language) libraries]]

[[Category:Free computer libraries]]

[[Category:Free software programmed in C]]