Is there any way to reduce the consumption of ROM resources under the GCC compilation platform?

RE: Is there any way to reduce the consumption of ROM resources under the GCC compilation platform?

Håkon Alseth — Mon, 10 Jun 2024 07:32:22 GMT

If you require different optimization levels, you must differentiate it either in code (#pragma directive), or adjust your makefile to allow individual optimization level on each compiled file.

In both scenarios, you will need to analyze which files require speed and which will require size optimization.

Kind regards,

Håkon

RE: Is there any way to reduce the consumption of ROM resources under the GCC compilation platform?

koala — Sun, 09 Jun 2024 03:12:59 GMT

Hi,

Are there any other alternatives? Using this approach makes my code less generic and requires extra time to think about which functions really need to be optimized separately.

RE: Is there any way to reduce the consumption of ROM resources under the GCC compilation platform?

Håkon Alseth — Mon, 03 Jun 2024 09:41:30 GMT

Hi,

[quote user=""]Is there any way to optimize the program's ROM usage? Our code is very timing-sensitive, and if we change it directly from O3 to Os, we will get obvious ROM benefits, but our program execution will start to get messy.[/quote]

If there are certain functions which require another optimization level, you can use the gcc #pragma directive to change optimization:

#pragma GCC push_options
#pragma GCC optimize ("O3")

...functions to optimize with -O3..

#pragma GCC pop_options

Then you can keep the rest of your firmware on "-Os" to allow for a lower ROM footprint.

Kind regards,

Håkon