std::fma
From cppreference.com
| Defined in header <cmath>
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| float fma( float x, float y, float z );
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(1) | (since C++11) |
| double fma( double x, double y, double z );
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(2) | (since C++11) |
| long double fma( long double x, long double y, long double z );
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(3) | (since C++11) |
| Promoted fma( Arithmetic x, Arithmetic y, Arithmetic z );
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(4) | (since C++11) |
| #define FP_FAST_FMA /* implementation-defined */
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(5) | (since C++11) |
| #define FP_FAST_FMAF /* implementation-defined */
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(6) | (since C++11) |
| #define FP_FAST_FMAL /* implementation-defined */
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(7) | (since C++11) |
The fma functions compute (x*y) + z, rounded as one ternary operation, according to the rounding mode characterized by the value of FLT_ROUNDS.
4) 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.
5-7) 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.
[edit] Parameters
| x, y, z | - | floating point values |
[edit] Return value
(x*y) + z, rounded as one ternary operation
[edit] See also
| (C++11)
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signed remainder of the division operation (function) |
| (C++11)
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signed remainder as well as the three last bits of the division operation (function) |