FMA(3) Linux Programmer's 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)
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