blend

eve::blend = detail::named_shuffle_2<blend_t> {}

inlineconstexpr

Note

You might be looking for eve::if_else_.

Defined in Header

#include <eve/module/core.hpp>

(TODO: support mixing more than 2 registers)

Accepts a pattern with just 0 and 1 that indicates number of the element for the current slot

blend([0, 1, 2, 3], [4, 5, 6, 7], pattern<1, 0, 0, 1>) -> [4, 1, 2, 7].

As any named shuffle, allows to specify a group size.

template<simd_value T, std::ptrdiff_t G, std::ptrdiff_t ...I>  // (1)
T blend(T x, T y, fixed<G>, pattern_t<I...>)
template<simd_value T, std::ptrdiff_t G>
T blend(T x, T y, fixed<G>, pattern_formula auto gen)
 
template<simd_value T, std::ptrdiff_t ...I> // (2)
T blend(T x, T y, pattern_t<I...>)
template<simd_value T, std::ptrdiff_t ...I>
T blend(T x, T y, pattern_formula auto gen)

Parameters

• x, y - values to shuffle.
• G - (optional) - number of elements to treat as one.
• pattern - how to shuffle elements I == 0 -> take a group from x I == 1 -> take a group from y
• gen - eve::pattern_formula = alternative way to specify a pattern, computing it from index and size.

Return value

Returns a register with elements selected according to the mask.

Example

#include <eve/module/core.hpp>
 
#include <tts/tts.hpp>
 
using w_t = eve::wide<std::uint32_t, eve::fixed<4>>;
 
int
main()
{
  w_t x {0, 1, 2, 3};
  w_t y {4, 5, 6, 7};
 
  // basic example
  TTS_EXPECT(eve::all(w_t{4, 1, 2, 7} == eve::blend(x, y, eve::pattern<1, 0, 0, 1>)));
 
  // basic example, formula
  TTS_EXPECT(
      eve::all(w_t{0, 5, 2, 7} == eve::blend(x, y, [](int i, int /*size*/) { return i % 2; })));
 
  // mixing groups
  TTS_EXPECT(eve::all(w_t{4, 5, 2, 3} == eve::blend(x, y, eve::lane<2>, eve::pattern<1, 0>)));
}