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fma(3M)			Mathematical Library Functions		       fma(3M)

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

       c99 [ flag... ] file... -lm [ library... ]
       #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);

       These  functions compute (x * y) + z, rounded as one ternary operation.
       They compute the value (as if) to infinite precision and round once  to
       the  result format, according to the rounding mode characterized by the
       value of FLT_ROUNDS.

       Upon successful completion, these functions return (x * y) + z, rounded
       as one ternary operation.

       If x or y are NaN, a NaN is returned.

       If x multiplied by y is an exact infinity and z is also an infinity but
       with the opposite sign, a domain error occurs and a NaN is returned.

       If one of x and y is infinite, the other is 0, and z is not  a  NaN,  a
       domain error occurs and a NaN is returned.

       If x*y is not 0*Inf nor Inf*0 and z is a NaN, a NaN is returned.

       These functions will fail if:

       Domain Error    The  value  of  x*y+z  is  invalid  or the value x*y is

		       If   the	  integer   expression	 (math_errhandling   &
		       MATH_ERREXCEPT) is non-zero, the invalid floating-point
		       exception will be raised.

       Range Error     The result overflows.

		       If   the	  integer   expression	 (math_errhandling   &
		       MATH_ERREXCEPT)	is  non-zero,  the  overflow floating-
		       point exception will be raised.

       An application wanting to check for exceptions should  call  feclearex‐
       cept(FE_ALL_EXCEPT)  before  calling  these  functions.	On  return, if
       non-zero,  an  exception	 has been raised. An application should either
       examine the return value or check the floating point exception flags to
       detect exceptions.

       See attributes(5) for descriptions of the following attributes:

       │      ATTRIBUTE TYPE	     │	    ATTRIBUTE VALUE	   │
       │Interface Stability	     │Standard			   │
       │MT-Level		     │MT-Safe			   │

       feclearexcept(3M),   fetestexcept(3M),	math.h(3HEAD),	attributes(5),

SunOS 5.11			  12 Jul 2006			       fma(3M)

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