This intrinsic inserts a USAT instruction into the instruction stream generated by the compiler.
It enables you to saturate an unsigned value from within your C or C++ code.
int __usat(unsigned int val , unsigned int sat )
Is the value to be saturated.
Is the bit position to saturate to.
usat must be in the range 0 to 31.
The __usat intrinsic returns val saturated to the unsigned range 0 ≤ x ≤ 2 sat –1.
The compiler does not recognize the __usat intrinsic when compiling for a target that does not support the USAT 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 "__usat" declared implicitly.
- In C++ code: Error: #20: identifier "__usat" is undefined.