avx512_float.hpp

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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
// Copyright (c) Lawrence Livermore National Security, LLC and other
// RAJA Project Developers. See top-level LICENSE and COPYRIGHT
// files for dates and other details. No copyright assignment is required
// to contribute to RAJA.
//
// SPDX-License-Identifier: (BSD-3-Clause)
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
 
#ifdef __AVX512F__
 
#ifndef RAJA_policy_vector_register_avx512_float_HPP
#define RAJA_policy_vector_register_avx512_float_HPP
 
#include "RAJA/config.hpp"
#include "RAJA/util/macros.hpp"
#include "RAJA/pattern/tensor/internal/RegisterBase.hpp"
 
// Include SIMD intrinsics header file
#include <immintrin.h>
#include <cmath>
 
namespace RAJA
{
namespace expt
{
template<>
class Register<float, avx512_register>
    : public internal::expt::RegisterBase<Register<float, avx512_register>>
{
public:
  using base_type =
      internal::expt::RegisterBase<Register<float, avx512_register>>;
 
  using register_policy = avx512_register;
  using self_type       = Register<float, avx512_register>;
  using element_type    = float;
  using register_type   = __m512;
 
  using int_vector_type = Register<int32_t, avx512_register>;
 
 
private:
  register_type m_value;
 
  RAJA_INLINE
  __mmask16 createMask(camp::idx_t N) const
  {
    // Generate a mask
    switch (N)
    {
      case 0:
        return __mmask16(0x0000);
      case 1:
        return __mmask16(0x0001);
      case 2:
        return __mmask16(0x0003);
      case 3:
        return __mmask16(0x0007);
      case 4:
        return __mmask16(0x000F);
      case 5:
        return __mmask16(0x001F);
      case 6:
        return __mmask16(0x003F);
      case 7:
        return __mmask16(0x007F);
      case 8:
        return __mmask16(0x00FF);
      case 9:
        return __mmask16(0x01FF);
      case 10:
        return __mmask16(0x03FF);
      case 11:
        return __mmask16(0x07FF);
      case 12:
        return __mmask16(0x0FFF);
      case 13:
        return __mmask16(0x1FFF);
      case 14:
        return __mmask16(0x3FFF);
      case 15:
        return __mmask16(0x7FFF);
      case 16:
        return __mmask16(0xFFFF);
    }
    return __mmask16(0);
  }
 
  RAJA_INLINE
  __m512i createStridedOffsets(camp::idx_t stride) const
  {
    // Generate a strided offset list
    auto vstride = _mm512_set1_epi32(stride);
    auto vseq =
        _mm512_set_epi32(15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0);
    return _mm512_mullo_epi32(vstride, vseq);
  }
 
public:
  static constexpr camp::idx_t s_num_elem = 16;
 
  // AVX512F
  RAJA_INLINE
  Register() : base_type(), m_value(_mm512_setzero_ps()) {}
 
  RAJA_INLINE
  explicit Register(register_type const& c) : base_type(), m_value(c) {}
 
  RAJA_INLINE
  Register(self_type const& c) : base_type(), m_value(c.m_value) {}
 
  RAJA_INLINE
  self_type& operator=(self_type const& c)
  {
    m_value = c.m_value;
    return *this;
  }
 
  // AVX512F
  RAJA_INLINE
  Register(element_type const& c) : base_type(), m_value(_mm512_set1_ps(c)) {}
 
  RAJA_INLINE
  self_type& load_packed(element_type const* ptr)
  {
    // AVX512F
    m_value = _mm512_loadu_ps(ptr);
    return *this;
  }
 
  RAJA_INLINE
  self_type& load_packed_n(element_type const* ptr, camp::idx_t N)
  {
    // AVX512F
    m_value = _mm512_mask_loadu_ps(_mm512_setzero_ps(), createMask(N), ptr);
    return *this;
  }
 
  RAJA_INLINE
  self_type& load_strided(element_type const* ptr, camp::idx_t stride)
  {
    // AVX512F
    m_value = _mm512_i32gather_ps(createStridedOffsets(stride), ptr,
                                  sizeof(element_type));
    return *this;
  }
 
  RAJA_INLINE
  self_type& load_strided_n(element_type const* ptr,
                            camp::idx_t stride,
                            camp::idx_t N)
  {
    // AVX512F
    m_value = _mm512_mask_i32gather_ps(_mm512_setzero_ps(), createMask(N),
                                       createStridedOffsets(stride), ptr,
                                       sizeof(element_type));
    return *this;
  }
 
  RAJA_INLINE
  self_type const& store_packed(element_type* ptr) const
  {
    // AVX512F
    _mm512_storeu_ps(ptr, m_value);
    return *this;
  }
 
  RAJA_INLINE
  self_type const& store_packed_n(element_type* ptr, camp::idx_t N) const
  {
    // AVX512F
    _mm512_mask_storeu_ps(ptr, createMask(N), m_value);
    return *this;
  }
 
  RAJA_INLINE
  self_type const& store_strided(element_type* ptr, camp::idx_t stride) const
  {
    // AVX512F
    _mm512_i32scatter_ps(ptr, createStridedOffsets(stride), m_value,
                         sizeof(element_type));
    return *this;
  }
 
  RAJA_INLINE
  self_type const& store_strided_n(element_type* ptr,
                                   camp::idx_t stride,
                                   camp::idx_t N) const
  {
    // AVX512F
    _mm512_mask_i32scatter_ps(ptr, createMask(N), createStridedOffsets(stride),
                              m_value, sizeof(element_type));
    return *this;
  }
 
  RAJA_INLINE
  element_type get(camp::idx_t i) const { return m_value[i]; }
 
  RAJA_INLINE
  self_type& set(element_type value, camp::idx_t i)
  {
    m_value[i] = value;
    return *this;
  }
 
  RAJA_HOST_DEVICE
 
  RAJA_INLINE
  self_type& broadcast(element_type const& value)
  {
    m_value = _mm512_set1_ps(value);
    return *this;
  }
 
  RAJA_HOST_DEVICE
 
  RAJA_INLINE
  self_type& copy(self_type const& src)
  {
    m_value = src.m_value;
    return *this;
  }
 
  RAJA_HOST_DEVICE
 
  RAJA_INLINE
  self_type add(self_type const& b) const
  {
    return self_type(_mm512_add_ps(m_value, b.m_value));
  }
 
  RAJA_HOST_DEVICE
 
  RAJA_INLINE
  self_type subtract(self_type const& b) const
  {
    return self_type(_mm512_sub_ps(m_value, b.m_value));
  }
 
  RAJA_HOST_DEVICE
 
  RAJA_INLINE
  self_type multiply(self_type const& b) const
  {
    return self_type(_mm512_mul_ps(m_value, b.m_value));
  }
 
  RAJA_HOST_DEVICE
 
  RAJA_INLINE
  self_type divide(self_type const& b) const
  {
    return self_type(_mm512_div_ps(m_value, b.m_value));
  }
 
  RAJA_HOST_DEVICE
 
  RAJA_INLINE
  self_type divide_n(self_type const& b, camp::idx_t N) const
  {
    return self_type(_mm512_maskz_div_ps(createMask(N), m_value, b.m_value));
  }
 
// only use FMA's if the compiler has them turned on
#ifdef __FMA__
  RAJA_INLINE
 
  RAJA_HOST_DEVICE
  self_type multiply_add(self_type const& b, self_type const& c) const
  {
    return self_type(_mm512_fmadd_ps(m_value, b.m_value, c.m_value));
  }
 
  RAJA_INLINE
 
  RAJA_HOST_DEVICE
  self_type multiply_subtract(self_type const& b, self_type const& c) const
  {
    return self_type(_mm512_fmsub_ps(m_value, b.m_value, c.m_value));
  }
#endif
 
  RAJA_INLINE
  element_type sum() const { return _mm512_reduce_add_ps(m_value); }
 
  RAJA_INLINE
  element_type max() const { return _mm512_reduce_max_ps(m_value); }
 
  RAJA_INLINE
  element_type max_n(camp::idx_t N) const
  {
    return _mm512_mask_reduce_max_ps(createMask(N), m_value);
  }
 
  RAJA_INLINE
  self_type vmax(self_type a) const
  {
    return self_type(_mm512_max_ps(m_value, a.m_value));
  }
 
  RAJA_INLINE
  element_type min() const { return _mm512_reduce_min_ps(m_value); }
 
  RAJA_INLINE
  element_type min_n(camp::idx_t N) const
  {
    return _mm512_mask_reduce_min_ps(createMask(N), m_value);
  }
 
  RAJA_INLINE
  self_type vmin(self_type a) const
  {
    return self_type(_mm512_min_ps(m_value, a.m_value));
  }
};
 
 
}  // namespace expt
 
}  // namespace RAJA
 
 
#endif
 
#endif  //__AVX512F__