User`s guide

Optimizing Conditionals
6-9
Optimizing Conditionals
(optimize_conditionals) This optimization reduces the MATLAB conditional
operators to scalar C conditional operators when both operands are known to
be integer scalars. The Compiler “knows” that
nargin, nargout, and for-loop
control variables (when using the above optimization) are integer scalars. For
example:
function test(a,b,c,d)
if (nargin < 4)
d = 0.0;
end
If you compile this with the -O none option, you get
...
if (mlfTobool(mclLt(mlfScalar(nargin_), mlfScalar(4)))) {
...
Compiling with -O none -O optimize_conditionals:on gives
...
if (nargin_ < 4) {
...