topic Re: optimization of lib function memcpy in S32K

optimization of lib function memcpy

LewisThin — Wed, 26 Nov 2025 10:11:28 GMT

hello everyone,

S32K344 and GCC 10.2 were used for my project developping. in my project, memset and memcpy were use freqently.

i found that the memcpy and memset in lib is vevry simple and low efficienct by byte operation.

i have developped the optimized functions using SIMD operations.

now i wanna to replace the memcpy and memset functions in the lib in a transparent method, namely, i wanna to use #include <string.h> in my source files.

and more, the optimized functions are in a .h file and with an inline modifier.

is there any way to achieve the goal.

thanks

best regards.

Re: optimization of lib function memcpy

VaneB — Wed, 26 Nov 2025 21:45:05 GMT

Hi @LewisThin

We do not recommend replacing functions from standard libraries. However, if you need to use a custom function, you can create and add your own library. For detailed instructions, refer to HOWTO: Add a static library file into S32DS GCC project, where you will find further information that may be useful.

BR, VaneB

optimization of lib function memcpy

LewisThin — Fri, 05 Dec 2025 06:25:00 GMT

hi, VaneB

Thanks for your reply. the instructions in the lib are too inefficient for our project. but memcpy is in many sources files and changing the source files are not accepteable.

do you have any other ideas?

best regards!

Re: optimization of lib function memcpy

Henrik-Wires — Fri, 12 Dec 2025 08:57:57 GMT

If you define a global memcpy function in your application then it should take priority over the standard function in the library. This can not be inline however, must be compiled as a standard global (non-static) function.

Another possible option is to add a define or alternatively a forced include via compiler directive settings, effectively rewriting the source files on the fly while compiling. Enabling your application and referenced drivers to use your version