avx512_int64.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_long_HPP
#define RAJA_policy_vector_register_avx512_long_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<int64_t, avx512_register>
    : public internal::expt::RegisterBase<Register<int64_t, avx512_register>>
{
public:
  using base_type =
      internal::expt::RegisterBase<Register<int64_t, avx512_register>>;
 
  using register_policy = avx512_register;
  using self_type       = Register<int64_t, avx512_register>;
  using element_type    = int64_t;
  using register_type   = __m512i;
 
  using int_vector_type = Register<int64_t, avx512_register>;
 
 
private:
  register_type m_value;
 
  RAJA_INLINE
  __mmask8 createMask(camp::idx_t N) const
  {
    // Generate a mask
    switch (N)
    {
      case 0:
        return __mmask8(0x00);
      case 1:
        return __mmask8(0x01);
      case 2:
        return __mmask8(0x03);
      case 3:
        return __mmask8(0x07);
      case 4:
        return __mmask8(0x0F);
      case 5:
        return __mmask8(0x1F);
      case 6:
        return __mmask8(0x3F);
      case 7:
        return __mmask8(0x7F);
      case 8:
        return __mmask8(0xFF);
    }
    return __mmask8(0);
  }
 
  RAJA_INLINE
  __m512i createStridedOffsets(camp::idx_t stride) const
  {
    // Generate a strided offset list
    auto vstride = _mm512_set1_epi64(stride);
    auto vseq    = _mm512_set_epi64(7, 6, 5, 4, 3, 2, 1, 0);
    return _mm512_mullo_epi64(vstride, vseq);
  }
 
public:
  static constexpr camp::idx_t s_num_elem = 8;
 
  // AVX512F
  RAJA_INLINE
  Register() : base_type(), m_value(_mm512_setzero_epi32()) {}
 
  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_epi64(c))
  {}
 
  RAJA_INLINE
  self_type& load_packed(element_type const* ptr)
  {
    // AVX512F
#if (defined(__GNUC__) && ((__GNUC__ >= 7) && (__GNUC__ <= 10))) ||            \
    (!defined(SYCL_LANGUAGE_VERSION) &&                                        \
     defined(__INTEL_LLVM_COMPILER))  // Check for oneapi's icpx.
    m_value = _mm512_maskz_loadu_epi64(
        ~0,
        ptr);  // May cause slowdown due to looping over 8 bytes, one at a time.
#else
    m_value =
        _mm512_loadu_epi64(ptr);  // GNU 7-10 are missing this instruction, as
                                  // is icpx as of version 2022.2.
#endif
    return *this;
  }
 
  RAJA_INLINE
  self_type& load_packed_n(element_type const* ptr, camp::idx_t N)
  {
    // AVX512F
    m_value =
        _mm512_mask_loadu_epi64(_mm512_setzero_epi32(), createMask(N), ptr);
    return *this;
  }
 
  RAJA_INLINE
  self_type& load_strided(element_type const* ptr, camp::idx_t stride)
  {
    // AVX512F
    m_value = _mm512_i64gather_epi64(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_i64gather_epi64(_mm512_setzero_epi32(), createMask(N),
                                          createStridedOffsets(stride), ptr,
                                          sizeof(element_type));
    return *this;
  }
 
  RAJA_INLINE
  self_type const& store_packed(element_type* ptr) const
  {
    // AVX512F
#if (defined(__GNUC__) && ((__GNUC__ >= 7) && (__GNUC__ <= 10))) ||            \
    (!defined(SYCL_LANGUAGE_VERSION) &&                                        \
     defined(__INTEL_LLVM_COMPILER))  // Check for oneapi's icpx.
    _mm512_mask_storeu_epi64(ptr, ~0,
                             m_value);  // May cause slowdown due to looping
                                        // over 8 bytes, one at a time.
#else
    _mm512_storeu_epi64(ptr,
                        m_value);  // GNU 7-10 are missing this instruction, as
                                   // is icpx as of version 2022.2.
#endif
    return *this;
  }
 
  RAJA_INLINE
  self_type const& store_packed_n(element_type* ptr, camp::idx_t N) const
  {
    // AVX512F
    _mm512_mask_storeu_epi64(ptr, createMask(N), m_value);
    return *this;
  }
 
  RAJA_INLINE
  self_type const& store_strided(element_type* ptr, camp::idx_t stride) const
  {
    // AVX512F
    _mm512_i64scatter_epi64(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_i64scatter_epi64(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_epi64(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_epi64(m_value, b.m_value));
  }
 
  RAJA_HOST_DEVICE
 
  RAJA_INLINE
  self_type subtract(self_type const& b) const
  {
    return self_type(_mm512_sub_epi64(m_value, b.m_value));
  }
 
  RAJA_HOST_DEVICE
 
  RAJA_INLINE
  self_type multiply(self_type const& b) const
  {
    return self_type(_mm512_mullo_epi64(m_value, b.m_value));
  }
 
  RAJA_HOST_DEVICE
 
  RAJA_INLINE
  self_type divide(self_type const& b) const
  {
    // AVX512 does not supply an integer divide, so do it manually
    return self_type(_mm512_set_epi64(get(7) / b.get(7), get(6) / b.get(6),
                                      get(5) / b.get(5), get(4) / b.get(4),
                                      get(3) / b.get(3), get(2) / b.get(2),
                                      get(1) / b.get(1), get(0) / b.get(0)));
  }
 
  RAJA_HOST_DEVICE
 
  RAJA_INLINE
  self_type divide_n(self_type const& b, camp::idx_t N) const
  {
    // AVX512 does not supply an integer divide, so do it manually
    return self_type(_mm512_set_epi64(
        N >= 8 ? get(7) / b.get(7) : 0, N >= 7 ? get(6) / b.get(6) : 0,
        N >= 6 ? get(5) / b.get(5) : 0, N >= 5 ? get(4) / b.get(4) : 0,
        N >= 4 ? get(3) / b.get(3) : 0, N >= 3 ? get(2) / b.get(2) : 0,
        N >= 2 ? get(1) / b.get(1) : 0, N >= 1 ? get(0) / b.get(0) : 0));
  }
 
  RAJA_INLINE
  element_type sum() const { return _mm512_reduce_add_epi64(m_value); }
 
  RAJA_INLINE
  element_type max() const { return _mm512_reduce_max_epi64(m_value); }
 
  RAJA_INLINE
  element_type max_n(camp::idx_t N) const
  {
    return _mm512_mask_reduce_max_epi64(createMask(N), m_value);
  }
 
  RAJA_INLINE
  self_type vmax(self_type a) const
  {
    return self_type(_mm512_max_epi64(m_value, a.m_value));
  }
 
  RAJA_INLINE
  element_type min() const { return _mm512_reduce_min_epi64(m_value); }
 
  RAJA_INLINE
  element_type min_n(camp::idx_t N) const
  {
    return _mm512_mask_reduce_min_epi64(createMask(N), m_value);
  }
 
  RAJA_INLINE
  self_type vmin(self_type a) const
  {
    return self_type(_mm512_min_epi64(m_value, a.m_value));
  }
};
 
 
}  // namespace expt
 
}  // namespace RAJA
 
 
#endif
 
#endif  //__AVX512F__