MATLAB: Does a Boolean XOR block become a bitwise operation in generated C code

bitwisebooleancode generationEmbedded Coderxor

When I generate code from a Boolean XOR block, it becomes a bitwise operation in the generated C code. Why is this the case, and are there any workarounds?

Best Answer

The "^" operator that is produced as generated code for the Logical XOR block is expected behavior since there is no true Boolean XOR operator in C.

If you wish to generate the relation operator "!=" instead, in the place of the Logical Operator XOR block you can use the Relational Operator block and select "~=".

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xor(I(1:2:end),  I(2:2:end))

MATLAB: Do I get a size mismatch error during code generation but not during regular MATLAB execution

The reason you see the error is because implicit expansion is not supported by code generation. As a workaround, you may consider using the "bsxfun".

For example, this line of code

z = x+y;

uses implicit expansion where the variable "y" is expanded to the same size as "x" before the sum is implemented by MATLAB. However, implicit expansion is not supported by code generation, and thus, you receive an error. Instead, as a possible workaround, you may consider this line of code

z = bsxfun(@plus,y,x);

where "bsxfun" explicitly sums each slice of "x" with "y".

For more details about the "bsxfun" function, you can refer to this page:

https://www.mathworks.com/help/matlab/ref/bsxfun.html

For a complete list of code generation supported features, you can refer to this page:

https://www.mathworks.com/help/coder/ug/matlab-language-features-supported-for-code-generation.html

Best Answer

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