fma

Sommaire

NAME

fma, fmaf, fmal - floating-point multiply and add

SYNOPSIS


#include <math.h>



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.

DESCRIPTION

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.

CONFORMING TO

C99

SEE ALSO

fenv(3), remainder(3), remquo(3)