Fused Multiply Add (FMA) intrinsics
These intrinsics perform the calculation result = a × b + c, incurring only a single rounding step.
Performing the calculation with a single rounding step, rather than multiplying and then adding with two roundings, can result in a better degree of accuracy.
Declared in math.h, the FMA intrinsics are:
double fma(double a, double b, double c); float fmaf(float a, float b, float c); long double fmal(long double a, long double b, long double c);
These intrinsics are only available in C99 mode.
They are only supported for the Cortex-A5 and Cortex-M4 processors.
If compiling for the Cortex-M4 processor, only fmaf() is available.