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OpenDarwin 7.2.1 - man page for fmaf (opendarwin section 3)

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 com-
     pute 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


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