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std::fma

De cppreference.com
< cpp‎ | numeric‎ | math

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C++
 
Bibliothèque Numerics
Fonctions mathématiques courantes
Virgule flottante environnement
Nombres complexes
Tableaux numériques
La génération de nombres pseudo-aléatoires
Moment de la compilation arithmétique rationnelle (C++11)
Génériques des opérations numériques
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Generic numeric operations
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iota (C++11)
accumulate
inner_product
adjacent_difference
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Fonctions
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Opérations de base
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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		 (C++11)
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Les fonctions exponentielles
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Exponential functions
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exp
exp2 (C++11)
expm1 (C++11)
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Floating point manipulation functions
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Macro constantes
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Macro constants
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FP_NORMAL
FP_SUBNORMAL
FP_ZERO
FP_INFINITE
FP_NAN		 (C++11)
(C++11)
(C++11)
(C++11)
(C++11)
</div>
 
</div>
Déclaré dans l'en-tête <cmath>
float       fma( float x, float y, float z );
 (1) (depuis C++11)
double      fma( double x, double y, double z );
 (2) (depuis C++11)
long double fma( long double x, long double y, long double z );
 (3) (depuis C++11)
Promoted    fma( Arithmetic x, Arithmetic y, Arithmetic z );
 (4) (depuis C++11)
#define FP_FAST_FMA  /* implementation-defined */
 (5) (depuis C++11)
#define FP_FAST_FMAF /* implementation-defined */
 (6) (depuis C++11)
#define FP_FAST_FMAL /* implementation-defined */
 (7) (depuis C++11)
Calculer les fonctions fma (x*y) + z, arrondie comme une opération ternaire, selon l'
Original:
The fma functions compute (x*y) + z, rounded as one ternary operation, according to the
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mode d'arrondi caractérisé par la valeur de FLT_ROUNDS .
Original:
rounding mode characterized by the value of FLT_ROUNDS.
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4)
Si un argument est de type intégral, il est jeté à double. Si aucun autre argument est long double, puis le type de retour est long double, sinon il est 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)
Si les constantes macro FP_FAST_FMAF, FP_FAST_FMA ou FP_FAST_FMAL sont définies, la fonction évalue std::fma plus vite que l'expression x*y+z pour float, double, arguments et long double, respectivement. Si elle est définie, ces macros à évaluer 1 entier .
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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[modifier] Paramètres

x, y, z -
valeurs à virgule flottante
Original:
floating point values
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[modifier] Retourne la valeur

(x*y) + z, arrondie comme une opération ternaire
Original:
(x*y) + z, rounded as one ternary operation
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[modifier] Voir aussi

(C++11)
signé reste de l'opération de division
Original:
signed remainder of the division operation
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(fonction) [edit]
(C++11)
signé reste ainsi que les trois derniers bits de l'opération de division
Original:
signed remainder as well as the three last bits of the division operation
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(fonction) [edit]
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