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FMA(3) Linux Programmer's Manual FMA(3)fma, fmaf, fmal - floating-point multiply and addNAME#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); Link withSYNOPSISFeature Test Macro Requirements for glibc (see feature_test_macros(7)): fma(), fmaf(), fmal(): _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; or cc-lm.-std=c99The fma() function computes x * y + z. The result is rounded as one ternary operation according to the cur- rent rounding mode (see fenv(3)).DESCRIPTIONThese functions return the value of x * y + z, rounded as one ternary operation. If x or y is a NaN, a NaN is returned. If x times y is an exact infinity, and z is an infinity with the opposite sign, a domain error occurs, and a NaN is returned. If one of x or y is an infinity, the other is 0, and z is not a NaN, a domain error occurs, and a NaN is returned. If one of x or y is an infinity, and the other is 0, and z is a NaN, a domain error occurs, and a NaN is returned. If x times y is not an infinity times zero (or vice versa), and z is a NaN, a NaN is returned. If the result overflows, a range error occurs, and an infinity with the correct sign is returned. If the result underflows, a range error occurs, and a signed 0 is returned.RETURN VALUESee math_error(7) for information on how to determine whether an error has occurred when calling these func- tions. The following errors can occur: Domain error: x * y + z, or x * y is invalid and z is not a NaN An invalid floating-point exception (FE_INVALID) is raised. Range error: result overflow An overflow floating-point exception (FE_OVERFLOW) is raised. Range error: result underflow An underflow floating-point exception (FE_UNDERFLOW) is raised. These functions do not set errno.ERRORSThese functions first appeared in glibc in version 2.1.VERSIONSC99, POSIX.1-2001.CONFORMING TOremainder(3), remquo(3)SEE ALSOThis page is part of release 3.25 of the Linux man-pages project. A description of the project, and informa- tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. 2008-10-06 FMA(3)COLOPHON

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