AN3350 datasheet(112/185 Pages) STMICROELECTRONICS

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Intermediate optimizations

AN3350

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Doc ID 018512 Rev 2

The rest of this section explains how to specify which functions to inline and how the

compiler performs the inlining:

●

Choosing which functions to inline

●

Inlining techniques

13.2.1

Choosing which functions to inline

The compiler offers several methods to specify which functions are eligible for inlining.

To specify that a function is eligible to be inlined, precede its definition with the inline,

__inline__

, or __inline keyword. To allow these keywords in C source code turn off the

only_std_keywords

pragma in your source code.

To verify that an eligible function has been inlined or not, use the Non-Inlined Functions

option in the IDE’s C/C++ Warnings panel or the warn_notinlined pragma. Example 67

shows an example.

Example 67 Specifying to the compiler that a function may be inlined

#pragma only_std_keywords off

inline int attempt_to_inline(void)

{

return 10;

}

To specify that a function must never be inlined, follow its definition’s specifier with

__attribute__((never_inline))

.Example 68 shows an example.

Example 68 Specifying to the compiler that a function must never be inlined

int never_inline(void) __attribute__((never_inline))

{

return 20;

}

To specify that no functions in a file may be inlined, including those that are defined with the

inline

, __inline__, or __inline keywords, use the dont_inline pragma.Example

69 shows an example.

Example 69 Specifying that no functions may be inlined

#pragma dont_inline on

/* Will not be inlined. */

inline int attempt_to_inline(void)

{

return 10;

}

/* Will not be inlined. */

int never_inline(void) __attribute__((never_inline))

{

return 20;

}

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