{"id":32502,"date":"2023-01-30T08:20:32","date_gmt":"2023-01-30T02:50:32","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-difference-between-intrinsic-inline-external-in-embedded-system-closed\/"},"modified":"2023-01-30T08:20:32","modified_gmt":"2023-01-30T02:50:32","slug":"solved-difference-between-intrinsic-inline-external-in-embedded-system-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-difference-between-intrinsic-inline-external-in-embedded-system-closed\/","title":{"rendered":"[Solved] Difference between intrinsic, inline, external in embedded system? [closed]"},"content":{"rendered":"

[ad_1]
\n<\/p>\n

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<\/div>\n
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Intrinsic functions<\/strong><\/p>\n

Are functions which the compiler implements directly when possible instead of calling an actual function in a library.
\nFor example they can be used for optimization or to reach specific hardware functionality.<\/p>\n

For ARM their exist an intrinsic function (and many others) called “__nop()” which inserts a single NOP (No Operation) instruction.<\/p>\n

See the following links for more information<\/p>\n

http:\/\/infocenter.arm.com\/help\/index.jsp?topic=\/com.arm.doc.dui0205g\/Ciabijcc.html<\/a><\/p>\n

What are intrinsics?<\/p>\n

https:\/\/en.wikipedia.org\/wiki\/Intrinsic_function<\/a><\/p>\n

Extern functions<\/strong><\/p>\n

Tells the compiler that something is defined elsewhere, so it doesn’t complain about being undefined or becoming multiply defined<\/p>\n

Although there is almost never any need to use the keyword extern when declaring a function in C or C++ since they normally are linked this way by default.<\/p>\n

See the following links for more information<\/p>\n

Extern functions in C vs C++<\/p>\n

http:\/\/www.cplusplus.com\/forum\/general\/21368\/<\/a><\/p>\n

Inline functions<\/strong><\/p>\n

Inline functions is an optimization technique used by the compilers, especially to reduce the execution time.
\nFor example, if you have a small function (not declared as inline) with one input parameter and you call this function multiple times.
\nThe processor will (among other things)<\/p>\n

    \n
  1. Save the parameter<\/li>\n
  2. Jump to the function<\/li>\n
  3. Execute the function<\/li>\n
  4. Store result (if any)<\/li>\n
  5. Jump back to previous position <\/li>\n<\/ol>\n

    Instead if the function was inline it would replace the call statement with the function code itself and then compile the code.<\/p>\n

    See the following links for more information<\/p>\n

    http:\/\/www.cplusplus.com\/articles\/2LywvCM9\/<\/a><\/p>\n

    https:\/\/en.wikipedia.org\/wiki\/Inline_function<\/a><\/p>\n

    http:\/\/www.cprogramming.com\/tutorial\/lesson13.html<\/a><\/p>\n

    There are several more links available on major search engines.<\/p>\n<\/p><\/div>\n

    <\/div>\n<\/div>\n

    4<\/span> <\/p><\/div>\n<\/div>\n

    [ad_2]<\/p>\n

    solved Difference between intrinsic, inline, external in embedded system? [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"

    [ad_1] Intrinsic functions Are functions which the compiler implements directly when possible instead of calling an actual function in a library. For example they can be used for optimization or to reach specific hardware functionality. For ARM their exist an intrinsic function (and many others) called “__nop()” which inserts a single NOP (No Operation) instruction. … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[2752,324,5909],"class_list":["post-32502","post","type-post","status-publish","format-standard","hentry","category-solved","tag-arm","tag-c","tag-neon"],"yoast_head":"\n[Solved] Difference between intrinsic, inline, external in embedded system? [closed] - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-difference-between-intrinsic-inline-external-in-embedded-system-closed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Difference between intrinsic, inline, external in embedded system? [closed] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Intrinsic functions Are functions which the compiler implements directly when possible instead of calling an actual function in a library. For example they can be used for optimization or to reach specific hardware functionality. For ARM their exist an intrinsic function (and many others) called “__nop()” which inserts a single NOP (No Operation) instruction. ... 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