NAME  SYNOPSIS  DESCRIPTION  RETURN VALUE  ERRORS  VERSIONS  ATTRIBUTES  CONFORMING TO  SEE ALSO  COLOPHON 

FMA(3) Linux Programmer's Manual FMA(3)
fma, fmaf, fmal  floatingpoint multiply and add
#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 with lm. Feature Test Macro Requirements for glibc (see feature_test_macros(7)): fma(), fmaf(), fmal(): _ISOC99_SOURCE  _POSIX_C_SOURCE >= 200112L
These functions compute x * y + z. The result is rounded as one ternary operation according to the current rounding mode (see fenv(3)).
These 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.
See math_error(7) for information on how to determine whether an error has occurred when calling these functions. The following errors can occur: Domain error: x * y + z, or x * y is invalid and z is not a NaN An invalid floatingpoint exception (FE_INVALID) is raised. Range error: result overflow An overflow floatingpoint exception (FE_OVERFLOW) is raised. Range error: result underflow An underflow floatingpoint exception (FE_UNDERFLOW) is raised. These functions do not set errno.
These functions first appeared in glibc in version 2.1.
For an explanation of the terms used in this section, see attributes(7). ┌──────────────────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├──────────────────────┼───────────────┼─────────┤ │fma(), fmaf(), fmal() │ Thread safety │ MTSafe │ └──────────────────────┴───────────────┴─────────┘
C99, POSIX.12001, POSIX.12008.
remainder(3), remquo(3)
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20160315 FMA(3)
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