Manpages - fma.3

fma, fmaf, fmal - floating-point 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 floating-point exception (FE_INVALID) is raised.
• An overflow floating-point exception (FE_OVERFLOW) is raised.
• An underflow floating-point 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).

C99, POSIX.1-2001, POSIX.1-2008.

*remainder*(3), *remquo*(3)

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