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std::fma – cppreference.com

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definiert in Header `<cmath>`

`float fma( float x, float y, float z );`	(1)	(seit C++11)

`double fma( double x, double y, double z );`	(2)	(seit C++11)

`long double fma( long double x, long double y, long double z );`	(3)	(seit C++11)

`Promoted fma( Arithmetic x, Arithmetic y, Arithmetic z );`	(4)	(seit C++11)

`#define FP_FAST_FMA /* implementation-defined */`	(5)	(seit C++11)

`#define FP_FAST_FMAF /* implementation-defined */`	(6)	(seit C++11)

`#define FP_FAST_FMAL /* implementation-defined */`	(7)	(seit C++11)

Die FMA Funktionen berechnen (x*y) + z, wie ein ternären Betrieb abgerundet, nach dem

Original:

The fma functions compute (x*y) + z, rounded as one ternary operation, according to the

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Rundungsmodus durch den Wert der dadurch FLT_ROUNDS .

Original:

rounding mode characterized by the value of FLT_ROUNDS.

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4)

Wenn ein Argument hat integralen Typ, wird es double gegossen. Wenn ein anderes Argument long double ist, dann ist der Rückgabetyp long double ist, sonst ist es double .

Original:

If any argument has integral type, it is cast to double. If any other argument is long double, then the return type is long double, otherwise it is double.

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5-7)

Wenn die Makro-Konstanten FP_FAST_FMAF, FP_FAST_FMA oder FP_FAST_FMAL definiert sind, die Funktion std::fma wertet schneller als die Expression x*y+z für float, double und long double Argumente sind. Wenn definiert, diese Makros zu Integer 1 auszuwerten .

Original:

If the macro constants FP_FAST_FMAF, FP_FAST_FMA, or FP_FAST_FMAL are defined, the function std::fma evaluates faster than the expression x*y+z for float, double, and long double arguments, respectively. If defined, these macros evaluate to integer 1.

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Parameter

x, y, z

-

Fließkommazahlen

Original:

floating point values

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Rückgabewert

(x*y) + z, abgerundet, wie ein ternären Betrieb

Original:

(x*y) + z, rounded as one ternary operation

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Siehe auch


	unterzeichnet Rest der Teilungsoperation Original: signed remainder of the division operation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktion) [edit]

	unterzeichnet Rest sowie die letzten drei Bits der Division Original: signed remainder as well as the three last bits of the division operation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktion) [edit]