opensolaris man page for fmal

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

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

SYNOPSIS
       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);

DESCRIPTION
       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.

RETURN VALUES
       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.

ERRORS
       These functions will fail if:

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

		       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.

USAGE
       An  application	wanting  to  check  for  exceptions should call feclearexcept(FE_ALL_EXCEPT) before calling these functions. On return, if
       fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is 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.

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

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

SunOS 5.11							    12 Jul 2006 							   fma(3M)