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std::fma

提供: cppreference.com
< cpp‎ | numeric‎ | math

 
 
ニューメリックスライブラリ
一般的な数学関数
浮動小数点環境
複素数
数値配列
擬似乱数生成
コンパイル時有理数演算 (C++11)
汎用の数値演算
Original:
Generic numeric operations
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iota(C++11)
accumulate
inner_product
adjacent_difference
partial_sum
 
一般的な数学関数
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)
(C++11)
(C++11)
指数関数
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Exponential functions
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exp
exp2(C++11)
expm1(C++11)
log
log10
log1p(C++11)
log2(C++11)
電源機能
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Power functions
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sqrt
cbrt(C++11)
hypot(C++11)
pow
三角関数や双曲線関数
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Trigonometric and hyperbolic functions
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sinh
cosh
tanh
asinh(C++11)
acosh(C++11)
atanh(C++11)
エラーおよびガンマ関数
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Error and gamma functions
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erf(C++11)
erfc(C++11)
lgamma(C++11)
tgamma(C++11)
最も近い整数の浮動小数点演算
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Nearest integer floating point operations
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ceil
floor
round
lround
llround
(C++11)
(C++11)
(C++11)
trunc(C++11)
nearbyint(C++11)
rint
lrint
llrint
(C++11)
(C++11)
(C++11)
点操作関数に浮かぶ
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Floating point manipulation functions
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ldexp
scalbn
scalbln
(C++11)
(C++11)
ilogb(C++11)
logb(C++11)
frexp
modf
nextafter
nexttoward
(C++11)
(C++11)
copysign(C++11)
分類/比較
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Classification/Comparison
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fpclassify(C++11)
isfinite(C++11)
isinf(C++11)
isnan(C++11)
isnormal(C++11)
signbit(C++11)
isgreater(C++11)
isgreaterequal(C++11)
isless(C++11)
islessequal(C++11)
islessgreater(C++11)
isunordered(C++11)
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)
(C++11)
(C++11)
(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.
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)
マクロ定数はFP_FAST_FMAFFP_FAST_FMA、またはFP_FAST_FMALが定義され、関数std::fmaはそれぞれx*y+zfloat、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]