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