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__qadd intrinsic

This intrinsic inserts a QADD instruction into the instruction stream generated by the compiler. It enables you to obtain the result of a saturating add of two integers from within your C or C++ code.


The compiler might optimize your code when it detects an opportunity to do so, using equivalent instructions from the same family to produce fewer instructions.


int __qadd(int val1, int val2)



is the first summand of the saturating add operation


is the second summand of the saturating add operation.

Return value

The __qadd intrinsic returns the saturating add of val1 and val2.


The compiler does not recognize the __qadd intrinsic when compiling for a target that does not support the QADD instruction. The compiler generates either a warning or an error in this case, depending on the source language:

  • In C code: Warning: #223-D: function "__qadd" declared implicitly.
  • In C++ code: Error: #20: identifier "__qadd" is undefined.
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