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29 lines
899 B
Markdown
29 lines
899 B
Markdown
[< back to index](../doc_index.md)
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# Macros and inlining
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## Macros
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`macro` keyword
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## Automatic inlining
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You can control inlining behavior in several ways:
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* functions declared with the `inline` keyword will be inlined if possible
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* functions declared with the `noinline` keyword will never be inlined
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* the remaining functions may be inlined only if the `-finline` command-line option is enabled
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and the compiler decides the function is worth doing
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## Automatic subroutine extraction
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Subroutine extraction is the opposite of inlining.
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When given the `-fsubroutine-extraction`, the compiler will attempt to extract common code fragments to new subroutines.
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The code will get smaller and slower.
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Generally, when using `-fsubroutine-extraction`, it's recommended to also use `-finline`.
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This allows the compiler to first inline and optimize code and then extract it back when appropriate.
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