- Turn on "Inline invariant signals" to precompute and inline values of invariant signals ingenerated code.
- Optimize global data access > Use Global to hold temporary results for using global variables for temporary data.
- Eliminate superfluous local variables (expression folding) can be turned off to compute local variables at each stage and allow better readability.
Code generation changes behavior from Matlab 2020b to 2023b
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"Not too long ago, I switched from Matlab version 2020b to 2023b, upgrading all Simulink files in the process. Now, I'm encountering an issue where the Simulink code generation structures the C files differently (see the code snippet below), causing the compiler to fail to compile them.
C-Code from Matlab-Version 2020b:
actuator_state = (uint8_T)!Process_U.alive;
if (Process_U.actuator_flag) {
actuator_state = (uint8_T)(int32_T)((int32_T)actuator_state | 2);
}
if (Process_U.state == 2) {
actuator_state = (uint8_T)(int32_T)((int32_T)actuator_state | 4);
}
if (Process_U.state == 3) {
actuator_state = (uint8_T)(int32_T)((int32_T)actuator_state | 8);
}
C-Code from Matlab-Version 2023b
if (Process_U.actuator_flag) {
b_a = (uint8_T)(int32_T)(!Process_U.alive | 2);
} else {
b_a = (uint8_T)!Process_U.alive;
}
if (Process_U.state == 2) {
b_a = (uint8_T)(int32_T)((int32_T)b_a | 4);
}
if (Process_U.state == 3) {
b_a = (uint8_T)(int32_T)((int32_T)b_a | 8);
}
I wanted to ask if you know which setting might be causing this change.
Thank you very much.
2 个评论
Brahmadev
2024-4-1
Looking at both the codes, they seem logically identical, except that in 2020b, "actuator_state" is defined before the if-else conditional statement. Can you provide more information on what exact issue you are facing while compiling the generated C code in 2023b or a model to reproduce the issue?
If you have the license for Embedded Coder, the following Code Generation > Optimization parameters can be tweaked to control the code generation as per your usage:
Also, if more control is needed over the generation of if-else conditional statements, if block can be used instead of switch block in simulink.
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