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);
float
fmaf(float x, float y, double z);
DESCRIPTION
The fma() and fmaf() 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() and fmaf() functions conform to ISO/IEC 9899:1999(E).
BSD July 24, 2003 BSD
Check Out this Related Man Page
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)
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