E.V.E
v2023.02.15
 
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◆ fnms

auto eve::fnms = functor<fnms_t>
inlineconstexpr

Header file

#include <eve/module/core.hpp>

Callable Signatures

namespace eve
{
// Regular overload
constexpr auto fnms(value auto x, value auto y, value auto z) noexcept; // 1
// Lanes masking
constexpr auto fnms[conditional_expr auto c](value auto x, value auto y, value auto z) noexcept; // 2
constexpr auto fnms[logical_value auto m](value auto x, value auto y, value auto z) noexcept; // 2
// Semantic option
constexpr auto fnms[pedantic](value auto x, value auto y, value auto z) noexcept; // 3
constexpr auto fnms[promote](value auto x, value auto y, value auto z) noexcept; // 4
}
Specifies that a type is a Conditional Expression.
Definition conditional.hpp:28
The concept logical_value<T> is satisfied if and only if T satisfies eve::value and the element type ...
Definition value.hpp:132
The concept value<T> is satisfied if and only if T satisfies either eve::scalar_value or eve::simd_va...
Definition value.hpp:34
constexpr auto fnms
strict_elementwise_callable computing the fused multiply add of its three parameters.
Definition fnms.hpp:85
EVE Main Namespace.
Definition abi.hpp:18

Parameters

Return value

  1. The value of -x*y-z as if calculated to infinite precision and rounded once is returned, but only if the hardware is in capacity to do it at reasonable cost.
  2. The operation is performed conditionnaly
  3. pedantic option always ensures the full compliance to fam properties. This can be very expensive if the system has no hardware capability.
  4. The operation is performed as if the parameters where promoted to the common type of the three parameters.

External references

Example

// revision 0
#include <eve/module/core.hpp>
#include <iostream>
#include <iomanip>
int main()
{
eve::wide wf0{0.0, 1.0, 2.0, 3.0, -1.0, -2.0, -3.0, -4.0};
eve::wide wf1{0.0, -4.0, 1.0, -1.0, 2.0, -2.0, 3.0, -3.0};
eve::wide wf2{0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0};
eve::wide wi0{0, 1, 2, 3, -1, -2, -3, -4};
eve::wide wi1{0, -4, 1, -1, 2, -2, 3, -3};
eve::wide wi2{0, 1, 2 ,3, 4, 5, 6, 7};
eve::wide wu0{0u, 1u, 2u, 3u, 4u, 5u, 6u, 7u};
eve::wide wu1{7u, 6u, 5u, 4u, 3u, 2u, 1u, 0u};
eve::wide wu2{0u, 2u, 4u, 6u, 1u, 3u, 5u, 7u};
std::cout << "<- wf0 = " << wf0 << "\n";
std::cout << "<- wf1 = " << wf1 << "\n";
std::cout << "<- wf2 = " << wf2 << "\n";
std::cout << "<- wi0 = " << wi0 << "\n";
std::cout << "<- wi1 = " << wi1 << "\n";
std::cout << "<- wi2 = " << wi2 << "\n";
std::cout << "<- wu0 = " << wu0 << "\n";
std::cout << "<- wu1 = " << wu1 << "\n";
std::cout << "<- wu2 = " << wu2 << "\n";
std::cout << "-> fnms(wf0, wf1, wf2) = " << eve::fnms(wf0, wf1, wf2) << "\n";
std::cout << "-> fnms[ignore_last(2)](wf0, wf1, wf2) = " << eve::fnms[eve::ignore_last(2)](wf0, wf1, wf2) << "\n";
std::cout << "-> fnms[wf0 != 0](wf0, wf1, wf2) = " << eve::fnms[wf0 != 0](wf0, wf1, wf2) << "\n";
std::cout << "-> fnms[pedantic](wf0, wf1, wf2) = " << eve::fnms[eve::pedantic](wf0, wf1, wf2) << "\n";
std::cout << "-> fnms[promote](wf0, wf1, wf2) = " << eve::fnms[eve::promote](wf0, wf1, wf2) << "\n";
std::cout << "-> fnms(wu0, wu1, wu2) = " << eve::fnms(wu0, wu1, wu2) << "\n";
std::cout << "-> fnms[ignore_last(2)](wu0, wu1, wu2) = " << eve::fnms[eve::ignore_last(2)](wu0, wu1, wu2) << "\n";
std::cout << "-> fnms[wu0 != 0](wu0, wu1, wu2) = " << eve::fnms[wu0 != 0](wu0, wu1, wu2) << "\n";
std::cout << "-> fnms[pedantic](wu0, wu1, wu2) = " << eve::fnms[eve::pedantic](wu0, wu1, wu2) << "\n";
std::cout << "-> fnms[promote](wu0, wu1, wu2) = " << eve::fnms[eve::promote](wu0, wu1, wu2) << "\n";
std::cout << "-> fnms(wi0, wi1, wi2) = " << eve::fnms(wi0, wi1, wi2) << "\n";
std::cout << "-> fnms[ignore_last(2)](wi0, wi1, wi2) = " << eve::fnms[eve::ignore_last(2)](wi0, wi1, wi2) << "\n";
std::cout << "-> fnms[wi0 != 0](wi0, wi1, wi2) = " << eve::fnms[wi0 != 0](wi0, wi1, wi2) << "\n";
std::cout << "-> fnms[pedantic](wi0, wi1, wi2) = " << eve::fnms[eve::pedantic](wi0, wi1, wi2) << "\n";
std::cout << "-> fnms[promote](wi0, wi1, wi2) = " << eve::fnms[eve::promote](wi0, wi1, wi2) << "\n";
std::cout << std::setprecision(20) << "-> fnms(wf0, wf1, wf2) = " << eve::fnms(wf0, wf1, wf2) << "\n";
std::cout << std::setprecision(20) << "-> fnms[lower](wf0, wf1, wf2) = " << eve::fnms[eve::lower](wf0, wf1, wf2) << "\n";
std::cout << std::setprecision(20) << "-> fnms[upper](wf0, wf1, wf2) = " << eve::fnms[eve::upper](wf0, wf1, wf2) << "\n";
std::cout << std::setprecision(20) << "-> fnms[lower][strict](wf0, wf1, wf2) = " << eve::fnms[eve::lower][eve::strict](wf0, wf1, wf2) << "\n";
std::cout << std::setprecision(20) << "-> fnms[upper][strict](wf0, wf1, wf2) = " << eve::fnms[eve::upper][eve::strict](wf0, wf1, wf2) << "\n";
}
Conditional expression ignoring the k last lanes from a eve::simd_value.
Definition conditional.hpp:332
Wrapper for SIMD registers.
Definition wide.hpp:70