FMA(3) Linux Programmers Manual FMA(3)
fma, fmaf, fmal - floating-point multiply and add
double fma(double x, double y, double z);
float fmaf(float x, float y, float z);
long double fmal(long double x, long double y, long double z);
Compile with -std=c99; link with -lm.
The fma() function computes x * y + z. The result is rounded according
to the rounding mode determined by the value of FLT_ROUNDS. FLT_ROUNDS
indicates the implementation-defined rounding behavior for floating-
point addition, and has one of the following values:
-1 The rounding mode is not determinable.
0 Rounding is towards 0.
1 Rounding is towards nearest number.
2 Rounding is towards positive infinity.
3 Rounding is towards negative infinity.
Other values represent machine-dependent, non-standard rounding modes.
fenv(3), remainder(3), remquo(3)
This page is part of release 3.05 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.