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std::fma

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< cpp‎ | numeric‎ | math

 
 
Numerik-Bibliothek
Gemeinsame mathematischen Funktionen
Floating-Point-Umgebung
Komplexe Zahlen
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Compile-time rationale Arithmetik (C++11)
Generische numerische Operationen
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Generic numeric operations
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iota(C++11)
accumulate
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Gemeinsame mathematischen Funktionen
Funktionen
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Functions
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Grundlegende Bedienung
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Basic operations
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remainder(C++11)
remquo(C++11)
fma(C++11)
fmax(C++11)
fmin(C++11)
fdim(C++11)
nan
nanf
nanl
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Exponentialfunktionen
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Exponential functions
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exp
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Power functions
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sqrt
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isfinite(C++11)
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Makro Konstanten
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Macro constants
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FP_NORMAL
FP_SUBNORMAL
FP_ZERO
FP_INFINITE
FP_NAN
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Defined 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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[Bearbeiten] Parameter

x, y, z -
Fließkommazahlen
Original:
floating point values
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[Bearbeiten] Rückgabewert

(x*y) + z, abgerundet, wie ein ternären Betrieb
Original:
(x*y) + z, rounded as one ternary operation
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[Bearbeiten] Siehe auch

(C++11)
unterzeichnet Rest der Teilungsoperation
Original:
signed remainder of the division operation
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(Funktion) [edit]
(C++11)
unterzeichnet Rest sowie die letzten drei Bits der Division
Original:
signed remainder as well as the three last bits of the division operation
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(Funktion) [edit]