This intrinsic inserts instructions equivalent to the saturating addition of an integer with itself into the instruction stream generated by the compiler. It enables you to obtain the saturating double of an integer from within your C or C++ code.
is the data value to be doubled.
__qdbl intrinsic returns the saturating add of
val with itself, or equivalently,
The compiler does not recognize the
__qdbl 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 "__qdbl" declared implicitly.
- In C++ code:
Error: #20: identifier "__qdbl" is undefined.