Managing integer divide by zero checks in MATLAB R2016b codegen output
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When generating C code using codegen in at least MATLAB R2016b that contains integer divisions like:
out = uint32(a)/uint32(b)
an elaborate scheme to check for division by zero is implemented as follows in C:
if (b == 0U) {
if (a == 0U) {
out = 0U;
} else {
out = MAX_uint32_T;
}
} else {
// the actual division regular case
}
I would like to be able to tell codegen that these zero checks are not necessary and only output the commented line but I am not able to find a configuration option for this functionality.
I would like so see an option like SaturateOnIntegerOverflow that is able to turn off adding code for Inf special cases but for zero division.
A different option would be the ability to tell codegen what range of values to expect for various input parameters or values.
Are either of the two options above available?
I am using the regular MATLAB Coder Toolbox from the command line in MATLAB R2016b as follows:
configstruct = coder.config('mex'); % can be exe
configstruct.SomeOption1 = SomeValue1;
configstruct.SomeOption2 = SomeValue2;
codegen(...
'SomeFunction.m',...
'-config',configstruct,...
'args',{...},...
);
The Embedded Coder Toolbox and Simulink are available to me if absolutely required.
4 Comments
Answers (1)
Birdman
on 13 Nov 2017
Go to Configuration Parameters->All Parameters and write Remove code that protects against division arithmetic exceptions. Its default value is off(unchecked). Make that on(checked).
10 Comments
Birdman
on 26 Nov 2017
Don't you have a way to implement what you are doing right now in Simulink? Because it will be a lot easier for you.
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