9.149 Fused Multiply Add (FMA)
These intrinsics perform the calculation
, incurring only a single rounding step.
result = a × b + c
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
long double fmal(long double
a, long double
b, long double
are only available in C99 mode.
They are only supported for the Cortex-M4 processor.
If compiling for the Cortex-M4 processor, only