Following are some of the methods you may adopt to optimize you C code for embedded systems:
-
Use a smaller data type for variables where possible. For example, use
int8_t
instead ofint
andint16_t
instead oflong
to reduce memory usage and increase speed. -
Avoid using unoptimized libraries or functions that are not optimized for embedded systems.
-
Use pointers carefully. Use pointers carefully and avoid using them unnecessarily to improve performance and reduce memory usage.
-
Optimize loops and conditional statements by avoiding unnecessary calculations and using efficient algorithms.
-
Use pre-compiler directives like
#define
and#ifdef
to optimize the code and improve performance. -
Use inline functions to avoid function call overhead and improve performance.
-
Avoid memory allocation during runtime as it can cause memory fragmentation and reduce performance.
-
Use hardware specific optimization techniques like instruction scheduling and register allocation to improve performance.
-
Avoid using floating-point operations. Floating-point operations are slower and require more memory than integer operations, so avoid using them whenever possible.
-
Bitwise operations are faster than arithmetic operations on most embedded systems. Use them whenever possible to optimize code.
-
Choose the most efficient algorithm for each task to improve performance and reduce memory usage.
-
Use compiler optimization flags, such as “-O2” or “-O3”, to enable the compiler to optimize the code for performance.
-
Use hardware-specific optimization techniques, such as using assembly language for critical sections of code, to maximize performance.
-
Use pre-increment and post-decrement operators, instead of post-increment and pre-decrement operators, as they are faster.
-
Use the
const
keyword to declare variables that will not be modified. This allows the compiler to optimize the code and improve performance.