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Inline Transformation: Difference between revisions
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→Procedure Inline Transformation in emmtrix Studio
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In summary, inline transformation is a powerful optimization, but it must be applied with care. Compilers provide keywords and options to guide inlining, but they also rightfully employ their own models to decide when inlining makes sense. As a developer, a good practice is to trust the compiler for general decisions, and only force inlining in cases where you have clear evidence (via profiling or knowledge of the code) that the compiler’s heuristic might be missing an opportunity. Tools like optimization reports or profile-guided optimization can assist in making those decisions. Ultimately, inline transformation is one of many tools in the compiler’s toolbox, and its effectiveness will vary – some code speeds up dramatically with inlining, while in other cases excessive inlining can degrade performance. The key is balancing those effects, a task that modern compilers handle through continual refinement of their inlining algorithms. | In summary, inline transformation is a powerful optimization, but it must be applied with care. Compilers provide keywords and options to guide inlining, but they also rightfully employ their own models to decide when inlining makes sense. As a developer, a good practice is to trust the compiler for general decisions, and only force inlining in cases where you have clear evidence (via profiling or knowledge of the code) that the compiler’s heuristic might be missing an opportunity. Tools like optimization reports or profile-guided optimization can assist in making those decisions. Ultimately, inline transformation is one of many tools in the compiler’s toolbox, and its effectiveness will vary – some code speeds up dramatically with inlining, while in other cases excessive inlining can degrade performance. The key is balancing those effects, a task that modern compilers handle through continual refinement of their inlining algorithms. | ||
== | ==Inline Transformation in emmtrix Studio== | ||
emmtrix Studio can implement | emmtrix Studio can implement inlining using #pragma directives or via the GUI. Inline is a transformation that inlines function bodies. It replaces function calls with their implementation. | ||
===Typical Usage and Benefits=== | ===Typical Usage and Benefits=== | ||
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{| class="wikitable" | {| class="wikitable" | ||
|- | |- | ||
|<syntaxhighlight lang="c"> | |In the following code, all functions calls within main are inlined.<syntaxhighlight lang="c"> | ||
#include <stdio.h> | #include <stdio.h> | ||
void func() { | void func() { | ||
printf( | printf("Hello World \n"); | ||
} | } | ||
#pragma EMX_TRANSFORMATION Inline | |||
int main() { | int main() { | ||
func(); | |||
return 0; | return 0; | ||
} | } | ||
</syntaxhighlight> | </syntaxhighlight> | ||
| | |The following code is the generated code after the transformation has been applied.<syntaxhighlight lang="c"> | ||
#include <stdio.h> | #include <stdio.h> | ||
int main(void) { | int main(void) { | ||
printf("Hello World\n"); | |||
return 0; | return 0; | ||
} | } | ||
</syntaxhighlight> | </syntaxhighlight> | ||
|} | |} | ||
===Parameters=== | |||
Following parameters can be set (each description is followed by keyword in pragma-syntax and default value): | |||
{| class="wikitable" | |||
|+ | |||
!Id | |||
!Default Value | |||
!Description | |||
|- | |||
|<code>remove_unused</code> | |||
|true | |||
|'''Remove unused inlined functions''' - Any inlined function that is not unused after inlining is removed. | |||
|} | |||
== External Links == | == External Links == | ||