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std::fma

提供: cppreference.com
< cpp‎ | numeric‎ | math

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C++
 
ニューメリックスライブラリ
一般的な数学関数
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複素数
数値配列
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Generic numeric operations
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機能します
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Functions
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基本操作
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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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Exponential functions
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Floating point manipulation functions
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マクロ定数
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Macro constants
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FP_NORMAL
FP_SUBNORMAL
FP_ZERO
FP_INFINITE
FP_NAN		(C++11)
(C++11)
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(C++11)
 
Defined in header <cmath>
float       fma( float x, float y, float z );
 (1) (C++11およびそれ以降)
double      fma( double x, double y, double z );
 (2) (C++11およびそれ以降)
long double fma( long double x, long double y, long double z );
 (3) (C++11およびそれ以降)
Promoted    fma( Arithmetic x, Arithmetic y, Arithmetic z );
 (4) (C++11およびそれ以降)
#define FP_FAST_FMA  /* implementation-defined */
 (5) (C++11およびそれ以降)
#define FP_FAST_FMAF /* implementation-defined */
 (6) (C++11およびそれ以降)
#define FP_FAST_FMAL /* implementation-defined */
 (7) (C++11およびそれ以降)
FMAの機能はによると、一つの三項演算として丸め(x*y) + zを計算します
Original:
The fma functions compute (x*y) + z, rounded as one ternary operation, according to the
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FLT_ROUNDSの値によって特徴付け丸めモード.
Original:
rounding mode characterized by the value of FLT_ROUNDS.
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4)
いずれかの引数が整数型を持つ場合、それはdoubleにキャストされます。他の引数はlong doubleあれば、戻り値の型はlong double、それ以外の場合はdoubleです.
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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)
マクロ定数はFP_FAST_FMAF、FP_FAST_FMA、またはFP_FAST_FMALが定義され、関数std::fmaはそれぞれx*y+z、float、とdouble引数に対する表現long doubleよりも速く評価された場合。定義されている場合、これらのマクロは整数1に評価.
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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[編集] パラメータ

x, y, z -
浮動小数点値
Original:
floating point values
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[編集] 値を返します

(x*y) + z、1三項演算として丸められます
Original:
(x*y) + z, rounded as one ternary operation
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[編集] も参照してください

(C++11)
除算演算の剰余を締結しました
Original:
signed remainder of the division operation
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(関数) [edit]
(C++11)
残りだけでなく、除算の最後の3つのビットを締結しました
Original:
signed remainder as well as the three last bits of the division operation
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(関数) [edit]
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