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fmaf(3) [osx man page]

FMA(3)							   BSD Library Functions Manual 						    FMA(3)

NAME
fma -- multiply and add, then round SYNOPSIS
#include <math.h> double fma(double x, double y, double z); long double fmal(long double x, long double y, long double z); float fmaf(float x, float y, float z); DESCRIPTION
The fma() 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 current rounding mode. SPECIAL VALUES
fma(x, y, z) returns a NaN and optionally raises the "invalid" floating-point exception if one of x and y is infinite, the other is 0, and z is a NaN. fma(x, y, z) returns a NaN and raises the "invalid" floating-point exception if one of x and y is infinite, the other is 0, and z is not NaN. fma(x, y, z) returns a NaN and raises the "invalid" floating-point exception if x times y is an exact infinity, and z is also an infinity but with the opposite sign. SEE ALSO
fdim(3), fmax(3), fmin(3) STANDARDS
The fma() functions conform to ISO/IEC 9899:2011. BSD
May 28, 2008 BSD

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

NAME
fma, fmaf, fmal - floating-point multiply-add SYNOPSIS
cc [ 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 5.10 20 Sep 2004 fma(3M)
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