This intrinsic inserts a VFP
VSQRT instruction into the instruction stream generated by the compiler. It enables you to obtain the square root of a double-precision floating-point value from within your C or C++ code.
__sqrt intrinsic is an analog of the standard C library function
sqrt(). It differs from the standard library function in that a call to
__sqrt is guaranteed to be compiled into a single, inline, machine
instruction on an ARM architecture-based processor equipped with a VFP coprocessor.
is a double-precision floating-point value.
__sqrt intrinsic returns the square root of
The compiler does not recognize the
__sqrt intrinsic when compiling for a
target that is not equipped with a VFP coprocessor. The compiler generates
either a warning or an error in this case, depending on the source language:
- In C code:
Warning: #223-D: function "__sqrt" declared implicitly.
- In C++ code:
Error: #20: identifier "__sqrt" is undefined.