lerp

eve::lerp = functor<lerp_t>

inlineconstexpr

Header file

#include <eve/module/core.hpp>

Callable Signatures

namespace eve
{
   // Regular overload
   constexpr auto lerp(floating_value auto x, floating_value auto y, floating_value auto t)                          noexcept; // 1
 
   // Lanes masking
   constexpr auto lerp[conditional_expr auto c](floating_value auto x, floating_value auto y, floating_value auto t) noexcept; // 2
   constexpr auto lerp[logical_value auto m](floating_value auto x, floating_value auto y, floating_value auto t)    noexcept; // 2
 
   // Semantic options
   constexpr auto abs[pedantic](floating_value auto x, floating_value auto y, floating_value auto t)                 noexcept; // 3
}

Parameters

• x, y, t: floating arguments.
• c: Conditional expression masking the operation.
• m: Logical value masking the operation.

Return value

1. The value of the interpolation (or extrapolation) between x and y is returned. The call is semantically equivalent to x+t*(y-x) but uses fma opportunities.
2. The operation is performed conditionnaly
3. pedantic version of fma is used internally.

Example

// revision 0
#include <eve/module/core.hpp>
#include <iostream>
 
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};
 
  std::cout << "<- wf0                                 = " << wf0 << "\n";
  std::cout << "<- wf1                                 = " << wf1 << "\n";
  std::cout << "<- wf2                                 = " << wf2 << "\n";
                                                       
  std::cout << "-> lerp(wf0, wf1, wf2)                 = " << eve::lerp(wf0, wf1, wf2) << "\n";
  std::cout << "-> lerp[ignore_last(2)](wf0, wf1, wf2) = " << eve::lerp[eve::ignore_last(2)](wf0, wf1, wf2) << "\n";
  std::cout << "-> lerp[wf0 != 0](wf0, wf1, wf2)       = " << eve::lerp[wf0 != 0](wf0, wf1, wf2) << "\n";
}