memory.hpp

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//==-------------- memory.hpp - DPC++ Explicit SIMD API --------------------==//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// Implement Explicit SIMD memory-access APIs.
//===----------------------------------------------------------------------===//
 
#pragma once
 
#include <CL/sycl/half_type.hpp>
#include <sycl/ext/intel/esimd/common.hpp>
#include <sycl/ext/intel/esimd/detail/memory_intrin.hpp>
#include <sycl/ext/intel/esimd/detail/types.hpp>
#include <sycl/ext/intel/esimd/detail/util.hpp>
#include <sycl/ext/intel/esimd/simd.hpp>
 
#include <cstdint>
 
__SYCL_INLINE_NAMESPACE(cl) {
namespace __ESIMD_NS {
 
 
 
 
 
 
namespace detail {
// Type used in internal functions to designate SLM access by
// providing dummy accessor of this type. Used to make it possible to delegate
// implemenations of SLM memory accesses to general surface-based memory
// accesses and thus reuse validity checks etc.
struct LocalAccessorMarker {};
 
} // namespace detail
 
 
 
template <typename AccessorTy>
__ESIMD_API SurfaceIndex get_surface_index(AccessorTy acc) {
  if constexpr (std::is_same_v<detail::LocalAccessorMarker, AccessorTy>) {
    return detail::SLM_BTI;
  } else {
    return __esimd_get_surface_index(
        detail::AccessorPrivateProxy::getNativeImageObj(acc));
  }
}
 
#define __ESIMD_GET_SURF_HANDLE(acc) get_surface_index(acc)
 
// TODO @Pennycook
// {quote}
// ...I'd like us to think more about what we can do to make these interfaces
// more user - friendly. A user providing cache hints has to provide a lot more
// template arguments than required.Could we make this nicer by providing the
// hints as tag - type arguments ?
// ...
//   // Without cache hints, type and length can be deduced from offsets
//   float* p;
//   simd<uint32_t, 16> offsets;
//   auto result = flat_load(p, offsets);
//
//   // With cache hints as templates, verbosity increases significantly:
//   // - Providing any cache hint forces the user to specify the type and
//   length float* p; simd<uint32_t, 16> offsets; auto result =
//   flat_load<uint32_t, 16, 1, CacheHint::Foo, CacheHint::Bar>(p, offsets);
//
//   // With cache hints as tag types, verbosity is reduced:
//   // - Providing a cache hint does not prevent deduction of type and length
//   float* p;
//   simd <uint32_t, 16> offsets;
//   auto result = flat_load(p, offsets, CacheHint::Foo{});
//
// Note also that the templated form prevents a developer from specifying an L3
// hint without also explicitly specifying an L1 hint. If flat_load accepted a
// list of hints, it might be possible to refactor the hints to specify them in
// any order, and it may be more extensible to future cache hints:
// {/quote}
//
// TODO @keryell
// {quote}
// An approach a la https ://github.com/chriskohlhoff/propria from
// @chriskohlhoff would be to add a property to the pointer, such as
//
//    auto result = flat_load(p, offsets);
//    auto result = flat_load(decorate<CacheHint::Foo, CacheHint::Bar>(p),
//    offsets);
// The advantage is that you do not have to change all tour API and all the uses
// of this decorated pointer will benefit from this. decorate is to be bikeshed
// accordingly.
// {/quote}
//
 
template <typename Tx, int N, class T = detail::__raw_t<Tx>>
__ESIMD_API std::enable_if_t<detail::isPowerOf2(N, 32), simd<Tx, N>>
gather(const Tx *p, simd<uint32_t, N> offsets, simd_mask<N> mask = 1) {
  simd<uint64_t, N> offsets_i = convert<uint64_t>(offsets);
  simd<uint64_t, N> addrs(reinterpret_cast<uint64_t>(p));
  addrs = addrs + offsets_i;
 
  if constexpr (sizeof(T) == 1) {
    auto Ret = __esimd_svm_gather<T, N, detail::ElemsPerAddrEncoding<4>(),
                                  detail::ElemsPerAddrEncoding<1>()>(
        addrs.data(), mask.data());
    return __esimd_rdregion<T, N * 4, N, /*VS*/ 0, N, 4>(Ret, 0);
  } else if constexpr (sizeof(T) == 2) {
    auto Ret = __esimd_svm_gather<T, N, detail::ElemsPerAddrEncoding<2>(),
                                  detail::ElemsPerAddrEncoding<2>()>(
        addrs.data(), mask.data());
    return __esimd_rdregion<T, N * 2, N, /*VS*/ 0, N, 2>(Ret, 0);
  } else
    return __esimd_svm_gather<T, N, detail::ElemsPerAddrEncoding<1>(),
                              detail::ElemsPerAddrEncoding<1>()>(addrs.data(),
                                                                 mask.data());
}
 
template <typename Tx, int N, class T = detail::__raw_t<Tx>>
__ESIMD_API std::enable_if_t<detail::isPowerOf2(N, 32)>
scatter(Tx *p, simd<uint32_t, N> offsets, simd<Tx, N> vals,
        simd_mask<N> mask = 1) {
  simd<uint64_t, N> offsets_i = convert<uint64_t>(offsets);
  simd<uint64_t, N> addrs(reinterpret_cast<uint64_t>(p));
  addrs = addrs + offsets_i;
  if constexpr (sizeof(T) == 1) {
    simd<T, N * 4> D;
    D = __esimd_wrregion<T, N * 4, N, /*VS*/ 0, N, 4>(D.data(), vals.data(), 0);
    __esimd_svm_scatter<T, N, detail::ElemsPerAddrEncoding<4>(),
                        detail::ElemsPerAddrEncoding<1>()>(
        addrs.data(), D.data(), mask.data());
  } else if constexpr (sizeof(T) == 2) {
    simd<T, N * 2> D;
    D = __esimd_wrregion<T, N * 2, N, /*VS*/ 0, N, 2>(D.data(), vals.data(), 0);
    __esimd_svm_scatter<T, N, detail::ElemsPerAddrEncoding<2>(),
                        detail::ElemsPerAddrEncoding<2>()>(
        addrs.data(), D.data(), mask.data());
  } else
    __esimd_svm_scatter<T, N, detail::ElemsPerAddrEncoding<1>(),
                        detail::ElemsPerAddrEncoding<1>()>(
        addrs.data(), vals.data(), mask.data());
}
 
template <typename Tx, int N, typename Flags = vector_aligned_tag,
          class T = detail::__raw_t<Tx>,
          typename = std::enable_if_t<is_simd_flag_type_v<Flags>>>
__ESIMD_API simd<Tx, N> block_load(const Tx *addr, Flags = {}) {
  constexpr unsigned Sz = sizeof(T) * N;
  static_assert(Sz >= detail::OperandSize::OWORD,
                "block size must be at least 1 oword");
  static_assert(Sz % detail::OperandSize::OWORD == 0,
                "block size must be whole number of owords");
  static_assert(detail::isPowerOf2(Sz / detail::OperandSize::OWORD),
                "block must be 1, 2, 4 or 8 owords long");
  static_assert(Sz <= 8 * detail::OperandSize::OWORD,
                "block size must be at most 8 owords");
 
  uintptr_t Addr = reinterpret_cast<uintptr_t>(addr);
  if constexpr (Flags::template alignment<simd<T, N>> >=
                detail::OperandSize::OWORD) {
    return __esimd_svm_block_ld<T, N>(Addr);
  } else {
    return __esimd_svm_block_ld_unaligned<T, N>(Addr);
  }
}
 
template <typename Tx, int N, typename AccessorTy,
          typename Flags = vector_aligned_tag,
          typename = std::enable_if_t<is_simd_flag_type_v<Flags>>,
          class T = detail::__raw_t<Tx>>
__ESIMD_API simd<Tx, N> block_load(AccessorTy acc, uint32_t offset,
                                   Flags = {}) {
#ifdef __ESIMD_FORCE_STATELESS_MEM
  return block_load<Tx, N>(__ESIMD_DNS::accessorToPointer<Tx>(acc, offset));
#else
  constexpr unsigned Sz = sizeof(T) * N;
  static_assert(Sz >= detail::OperandSize::OWORD,
                "block size must be at least 1 oword");
  static_assert(Sz % detail::OperandSize::OWORD == 0,
                "block size must be whole number of owords");
  static_assert(detail::isPowerOf2(Sz / detail::OperandSize::OWORD),
                "block must be 1, 2, 4 or 8 owords long");
  static_assert(Sz <= 8 * detail::OperandSize::OWORD,
                "block size must be at most 8 owords");
 
  auto surf_ind = __esimd_get_surface_index(
      detail::AccessorPrivateProxy::getNativeImageObj(acc));
 
  if constexpr (Flags::template alignment<simd<T, N>> >=
                detail::OperandSize::OWORD) {
    return __esimd_oword_ld<T, N>(surf_ind, offset >> 4);
  } else {
    return __esimd_oword_ld_unaligned<T, N>(surf_ind, offset);
  }
#endif
}
 
template <typename Tx, int N, class T = detail::__raw_t<Tx>>
__ESIMD_API void block_store(Tx *p, simd<Tx, N> vals) {
  constexpr unsigned Sz = sizeof(T) * N;
  static_assert(Sz >= detail::OperandSize::OWORD,
                "block size must be at least 1 oword");
  static_assert(Sz % detail::OperandSize::OWORD == 0,
                "block size must be whole number of owords");
  static_assert(detail::isPowerOf2(Sz / detail::OperandSize::OWORD),
                "block must be 1, 2, 4 or 8 owords long");
  static_assert(Sz <= 8 * detail::OperandSize::OWORD,
                "block size must be at most 8 owords");
 
  uintptr_t Addr = reinterpret_cast<uintptr_t>(p);
  __esimd_svm_block_st<T, N>(Addr, vals.data());
}
 
template <typename Tx, int N, typename AccessorTy,
          class T = detail::__raw_t<Tx>>
__ESIMD_API void block_store(AccessorTy acc, uint32_t offset,
                             simd<Tx, N> vals) {
#ifdef __ESIMD_FORCE_STATELESS_MEM
  block_store<Tx, N>(__ESIMD_DNS::accessorToPointer<Tx>(acc, offset), vals);
#else
  constexpr unsigned Sz = sizeof(T) * N;
  static_assert(Sz >= detail::OperandSize::OWORD,
                "block size must be at least 1 oword");
  static_assert(Sz % detail::OperandSize::OWORD == 0,
                "block size must be whole number of owords");
  static_assert(detail::isPowerOf2(Sz / detail::OperandSize::OWORD),
                "block must be 1, 2, 4 or 8 owords long");
  static_assert(Sz <= 8 * detail::OperandSize::OWORD,
                "block size must be at most 8 owords");
 
  auto surf_ind = __esimd_get_surface_index(
      detail::AccessorPrivateProxy::getNativeImageObj(acc));
  __esimd_oword_st<T, N>(surf_ind, offset >> 4, vals.data());
#endif
}
 
 
 
// Implementations of accessor-based gather and scatter functions
namespace detail {
template <typename T, int N, typename AccessorTy>
ESIMD_INLINE
    ESIMD_NODEBUG std::enable_if_t<(sizeof(T) <= 4) &&
                                   (N == 1 || N == 8 || N == 16 || N == 32) &&
                                   !std::is_pointer<AccessorTy>::value>
    scatter_impl(AccessorTy acc, simd<T, N> vals, simd<uint32_t, N> offsets,
                 uint32_t glob_offset, simd_mask<N> mask) {
 
  constexpr int TypeSizeLog2 = detail::ElemsPerAddrEncoding<sizeof(T)>();
  // TODO (performance) use hardware-supported scale once BE supports it
  constexpr int16_t scale = 0;
  const auto si = __ESIMD_GET_SURF_HANDLE(acc);
 
  if constexpr (sizeof(T) < 4) {
    using Tint = std::conditional_t<std::is_integral_v<T>, T,
                                    detail::uint_type_t<sizeof(T)>>;
    using Treal = __raw_t<T>;
    simd<Tint, N> vals_int = bitcast<Tint, Treal, N>(std::move(vals).data());
    using PromoT =
        typename sycl::detail::conditional_t<std::is_signed<Tint>::value,
                                             int32_t, uint32_t>;
    const simd<PromoT, N> promo_vals = convert<PromoT>(std::move(vals_int));
    __esimd_scatter_scaled<PromoT, N, decltype(si), TypeSizeLog2, scale>(
        mask.data(), si, glob_offset, offsets.data(), promo_vals.data());
  } else {
    __esimd_scatter_scaled<T, N, decltype(si), TypeSizeLog2, scale>(
        mask.data(), si, glob_offset, offsets.data(), vals.data());
  }
}
 
template <typename T, int N, typename AccessorTy>
ESIMD_INLINE ESIMD_NODEBUG std::enable_if_t<
    (sizeof(T) <= 4) && (N == 1 || N == 8 || N == 16 || N == 32) &&
        !std::is_pointer<AccessorTy>::value,
    simd<T, N>>
gather_impl(AccessorTy acc, simd<uint32_t, N> offsets, uint32_t glob_offset,
            simd_mask<N> mask) {
 
  constexpr int TypeSizeLog2 = detail::ElemsPerAddrEncoding<sizeof(T)>();
  // TODO (performance) use hardware-supported scale once BE supports it
  constexpr uint32_t scale = 0;
  const auto si = get_surface_index(acc);
 
  if constexpr (sizeof(T) < 4) {
    using Tint = std::conditional_t<std::is_integral_v<T>, T,
                                    detail::uint_type_t<sizeof(T)>>;
    using Treal = __raw_t<T>;
    static_assert(std::is_integral<Tint>::value,
                  "only integral 1- & 2-byte types are supported");
    using PromoT =
        typename sycl::detail::conditional_t<std::is_signed<Tint>::value,
                                             int32_t, uint32_t>;
    const simd<PromoT, N> promo_vals =
        __esimd_gather_masked_scaled2<PromoT, N, decltype(si), TypeSizeLog2,
                                      scale>(si, glob_offset, offsets.data(),
                                             mask.data());
    auto Res = convert<Tint>(promo_vals);
 
    if constexpr (!std::is_same_v<Tint, T>) {
      return detail::bitcast<Treal, Tint, N>(Res.data());
    } else {
      return Res;
    }
  } else {
    return __esimd_gather_masked_scaled2<T, N, decltype(si), TypeSizeLog2,
                                         scale>(si, glob_offset, offsets.data(),
                                                mask.data());
  }
}
 
} // namespace detail
 
 
 
template <typename T, int N, typename AccessorTy>
__ESIMD_API std::enable_if_t<(sizeof(T) <= 4) &&
                                 (N == 1 || N == 8 || N == 16 || N == 32) &&
                                 !std::is_pointer<AccessorTy>::value,
                             simd<T, N>>
gather(AccessorTy acc, simd<uint32_t, N> offsets, uint32_t glob_offset = 0,
       simd_mask<N> mask = 1) {
#ifdef __ESIMD_FORCE_STATELESS_MEM
  return gather<T, N>(__ESIMD_DNS::accessorToPointer<T>(acc, glob_offset),
                      offsets, mask);
#else
  return detail::gather_impl<T, N, AccessorTy>(acc, offsets, glob_offset, mask);
#endif
}
 
template <typename T, int N, typename AccessorTy>
__ESIMD_API std::enable_if_t<(sizeof(T) <= 4) &&
                             (N == 1 || N == 8 || N == 16 || N == 32) &&
                             !std::is_pointer<AccessorTy>::value>
scatter(AccessorTy acc, simd<uint32_t, N> offsets, simd<T, N> vals,
        uint32_t glob_offset = 0, simd_mask<N> mask = 1) {
#ifdef __ESIMD_FORCE_STATELESS_MEM
  scatter<T, N>(__ESIMD_DNS::accessorToPointer<T>(acc, glob_offset), offsets,
                vals, mask);
#else
  detail::scatter_impl<T, N, AccessorTy>(acc, vals, offsets, glob_offset, mask);
#endif
}
 
template <typename T, typename AccessorTy>
__ESIMD_API T scalar_load(AccessorTy acc, uint32_t offset) {
  const simd<T, 1> Res =
      gather<T, 1, AccessorTy>(acc, simd<uint32_t, 1>(offset));
  return Res[0];
}
 
template <typename T, typename AccessorTy>
__ESIMD_API void scalar_store(AccessorTy acc, uint32_t offset, T val) {
  scatter<T, 1, AccessorTy>(acc, simd<uint32_t, 1>(offset), simd<T, 1>(val));
}
 
template <rgba_channel_mask RGBAMask = rgba_channel_mask::ABGR, typename T,
          int N>
__ESIMD_API std::enable_if_t<(N == 8 || N == 16 || N == 32) && sizeof(T) == 4,
                             simd<T, N * get_num_channels_enabled(RGBAMask)>>
gather_rgba(const T *p, simd<uint32_t, N> offsets, simd_mask<N> mask = 1) {
  simd<uint64_t, N> offsets_i = convert<uint64_t>(offsets);
  simd<uint64_t, N> addrs(reinterpret_cast<uint64_t>(p));
  addrs = addrs + offsets_i;
  return __esimd_svm_gather4_scaled<detail::__raw_t<T>, N, RGBAMask>(
      addrs.data(), mask.data());
}
 
template <typename T, int N, rgba_channel_mask RGBAMask>
__SYCL_DEPRECATED("use gather_rgba<rgba_channel_mask>()")
__ESIMD_API std::enable_if_t<
    (N == 8 || N == 16 || N == 32) && sizeof(T) == 4,
    simd<T, N * get_num_channels_enabled(
                    RGBAMask)>> gather_rgba(const T *p,
                                            simd<uint32_t, N> offsets,
                                            simd_mask<N> mask = 1) {
  return gather_rgba<RGBAMask>(p, offsets, mask);
}
 
namespace detail {
template <rgba_channel_mask M> static void validate_rgba_write_channel_mask() {
  using CM = rgba_channel_mask;
  static_assert(
      (M == CM::ABGR || M == CM::BGR || M == CM::GR || M == CM::R) &&
      "Only ABGR, BGR, GR, R channel masks are valid in write operations");
}
} // namespace detail
 
template <rgba_channel_mask RGBAMask = rgba_channel_mask::ABGR, typename T,
          int N>
__ESIMD_API std::enable_if_t<(N == 8 || N == 16 || N == 32) && sizeof(T) == 4>
scatter_rgba(T *p, simd<uint32_t, N> offsets,
             simd<T, N * get_num_channels_enabled(RGBAMask)> vals,
             simd_mask<N> mask = 1) {
  detail::validate_rgba_write_channel_mask<RGBAMask>();
  simd<uint64_t, N> offsets_i = convert<uint64_t>(offsets);
  simd<uint64_t, N> addrs(reinterpret_cast<uint64_t>(p));
  addrs = addrs + offsets_i;
  __esimd_svm_scatter4_scaled<detail::__raw_t<T>, N, RGBAMask>(
      addrs.data(), vals.data(), mask.data());
}
 
template <typename T, int N, rgba_channel_mask RGBAMask>
__SYCL_DEPRECATED("use scatter_rgba<rgba_channel_mask>()")
__ESIMD_API std::
    enable_if_t<(N == 8 || N == 16 || N == 32) && sizeof(T) == 4> scatter_rgba(
        T *p, simd<uint32_t, N> offsets,
        simd<T, N * get_num_channels_enabled(RGBAMask)> vals,
        simd_mask<N> mask = 1) {
  scatter_rgba<RGBAMask>(p, offsets, vals, mask);
}
 
template <rgba_channel_mask RGBAMask = rgba_channel_mask::ABGR,
          typename AccessorT, int N,
          typename T = typename AccessorT::value_type>
__ESIMD_API std::enable_if_t<((N == 8 || N == 16 || N == 32) &&
                              sizeof(T) == 4 && !std::is_pointer_v<AccessorT>),
                             simd<T, N * get_num_channels_enabled(RGBAMask)>>
gather_rgba(AccessorT acc, simd<uint32_t, N> offsets,
            uint32_t global_offset = 0, simd_mask<N> mask = 1) {
#ifdef __ESIMD_FORCE_STATELESS_MEM
  return gather_rgba<RGBAMask>(
      __ESIMD_DNS::accessorToPointer<T>(acc, global_offset), offsets, mask);
#else
  // TODO (performance) use hardware-supported scale once BE supports it
  constexpr uint32_t Scale = 0;
  const auto SI = get_surface_index(acc);
  return __esimd_gather4_masked_scaled2<detail::__raw_t<T>, N, RGBAMask,
                                        decltype(SI), Scale>(
      SI, global_offset, offsets.data(), mask.data());
#endif
}
 
template <rgba_channel_mask RGBAMask = rgba_channel_mask::ABGR,
          typename AccessorT, int N,
          typename T = typename AccessorT::value_type>
__ESIMD_API std::enable_if_t<(N == 8 || N == 16 || N == 32) && sizeof(T) == 4 &&
                             !std::is_pointer_v<AccessorT>>
scatter_rgba(AccessorT acc, simd<uint32_t, N> offsets,
             simd<T, N * get_num_channels_enabled(RGBAMask)> vals,
             uint32_t global_offset = 0, simd_mask<N> mask = 1) {
  detail::validate_rgba_write_channel_mask<RGBAMask>();
#ifdef __ESIMD_FORCE_STATELESS_MEM
  scatter_rgba<RGBAMask>(__ESIMD_DNS::accessorToPointer<T>(acc, global_offset),
                         offsets, vals, mask);
#else
  // TODO (performance) use hardware-supported scale once BE supports it
  constexpr uint32_t Scale = 0;
  const auto SI = get_surface_index(acc);
  __esimd_scatter4_scaled<T, N, decltype(SI), RGBAMask, Scale>(
      mask.data(), SI, global_offset, offsets.data(), vals.data());
#endif
}
 
 
 
namespace detail {
template <atomic_op Op, typename T, int N, unsigned NumSrc>
constexpr bool check_atomic() {
  if constexpr (!detail::isPowerOf2(N, 32)) {
    static_assert((detail::isPowerOf2(N, 32)),
                  "Execution size 1, 2, 4, 8, 16, 32 are supported");
    return false;
  }
 
  // No source operands.
  if constexpr (Op == atomic_op::inc || Op == atomic_op::dec) {
    if constexpr (NumSrc != 0) {
      static_assert(NumSrc == 0, "No source operands are expected");
      return false;
    }
    if constexpr (!is_type<T, uint16_t, uint32_t, uint64_t>()) {
      static_assert((is_type<T, uint16_t, uint32_t, uint64_t>()),
                    "Type UW, UD or UQ is expected");
      return false;
    }
    return true;
  }
 
  // One source integer operand.
  if constexpr (Op == atomic_op::add || Op == atomic_op::sub ||
                Op == atomic_op::min || Op == atomic_op::max ||
                Op == atomic_op::xchg || Op == atomic_op::bit_and ||
                Op == atomic_op::bit_or || Op == atomic_op::bit_xor ||
                Op == atomic_op::minsint || Op == atomic_op::maxsint) {
    if constexpr (NumSrc != 1) {
      static_assert(NumSrc == 1, "One source operand is expected");
      return false;
    }
    if constexpr ((Op != atomic_op::minsint && Op != atomic_op::maxsint) &&
                  !is_type<T, uint16_t, uint32_t, uint64_t>()) {
      static_assert((is_type<T, uint16_t, uint32_t, uint64_t>()),
                    "Type UW, UD or UQ is expected");
      return false;
    }
    if constexpr ((Op == atomic_op::minsint || Op == atomic_op::maxsint) &&
                  !is_type<T, int16_t, int32_t, int64_t>()) {
      static_assert((is_type<T, int16_t, int32_t, int64_t>()),
                    "Type W, D or Q is expected");
      return false;
    }
    return true;
  }
 
  // One source float operand.
  if constexpr (Op == atomic_op::fmax || Op == atomic_op::fmin ||
                Op == atomic_op::fadd || Op == atomic_op::fsub) {
    if constexpr (NumSrc != 1) {
      static_assert(NumSrc == 1, "One source operand is expected");
      return false;
    }
    if constexpr (!is_type<T, float, sycl::half>()) {
      static_assert((is_type<T, float, sycl::half>()),
                    "Type F or HF is expected");
      return false;
    }
    return true;
  }
 
  // Two source operands.
  if constexpr (Op == atomic_op::cmpxchg || Op == atomic_op::fcmpwr) {
    if constexpr (NumSrc != 2) {
      static_assert(NumSrc == 2, "Two source operands are expected");
      return false;
    }
    if constexpr (Op == atomic_op::cmpxchg &&
                  !is_type<T, uint16_t, uint32_t, uint64_t>()) {
      static_assert((is_type<T, uint16_t, uint32_t, uint64_t>()),
                    "Type UW, UD or UQ is expected");
      return false;
    }
    if constexpr (Op == atomic_op::fcmpwr && !is_type<T, float, sycl::half>()) {
      static_assert((is_type<T, float, sycl::half>()),
                    "Type F or HF is expected");
      return false;
    }
    return true;
  }
  // Unsupported svm atomic Op.
  return false;
}
} // namespace detail
 
 
 
template <atomic_op Op, typename Tx, int N, class T = detail::__raw_t<Tx>>
__ESIMD_API std::enable_if_t<detail::check_atomic<Op, Tx, N, 0>(), simd<Tx, N>>
atomic_update(Tx *p, simd<unsigned, N> offset, simd_mask<N> mask) {
  simd<uintptr_t, N> vAddr(reinterpret_cast<uintptr_t>(p));
  simd<uintptr_t, N> offset_i1 = convert<uintptr_t>(offset);
  vAddr += offset_i1;
  return __esimd_svm_atomic0<Op, T, N>(vAddr.data(), mask.data());
}
 
template <atomic_op Op, typename Tx, int N, class T = detail::__raw_t<Tx>>
__ESIMD_API std::enable_if_t<detail::check_atomic<Op, Tx, N, 1>(), simd<Tx, N>>
atomic_update(Tx *p, simd<unsigned, N> offset, simd<Tx, N> src0,
              simd_mask<N> mask) {
  simd<uintptr_t, N> vAddr(reinterpret_cast<uintptr_t>(p));
  simd<uintptr_t, N> offset_i1 = convert<uintptr_t>(offset);
  vAddr += offset_i1;
  return __esimd_svm_atomic1<Op, T, N>(vAddr.data(), src0.data(), mask.data());
}
 
template <atomic_op Op, typename Tx, int N, class T = detail::__raw_t<Tx>>
__ESIMD_API std::enable_if_t<detail::check_atomic<Op, Tx, N, 2>(), simd<Tx, N>>
atomic_update(Tx *p, simd<unsigned, N> offset, simd<Tx, N> src0,
              simd<Tx, N> src1, simd_mask<N> mask) {
  simd<uintptr_t, N> vAddr(reinterpret_cast<uintptr_t>(p));
  simd<uintptr_t, N> offset_i1 = convert<uintptr_t>(offset);
  vAddr += offset_i1;
  return __esimd_svm_atomic2<Op, T, N>(vAddr.data(), src0.data(), src1.data(),
                                       mask.data());
}
 
 
 
enum fence_mask : uint8_t {
  global_coherent_fence = 0x1,
  l3_flush_instructions = 0x2,
  l3_flush_texture_data = 0x4,
  l3_flush_constant_data = 0x8,
  l3_flush_rw_data = 0x10,
  local_barrier = 0x20,
  l1_flush_ro_data = 0x40,
  sw_barrier = 0x80
};
 
template <uint8_t cntl> __ESIMD_API void fence() { __esimd_fence(cntl); }
 
__SYCL_DEPRECATED("use fence<fence_mask>()")
__ESIMD_API void fence(fence_mask cntl) { __esimd_fence(cntl); }
 
__ESIMD_API void barrier() {
  __esimd_fence(fence_mask::global_coherent_fence | fence_mask::local_barrier);
  __esimd_barrier();
}
 
 
 
template <uint32_t SLMSize> __ESIMD_API void slm_init() {
  __esimd_slm_init(SLMSize);
}
 
__ESIMD_API void slm_init(uint32_t size) { __esimd_slm_init(size); }
 
template <typename T, int N>
__ESIMD_API
    std::enable_if_t<(N == 1 || N == 8 || N == 16 || N == 32), simd<T, N>>
    slm_gather(simd<uint32_t, N> offsets, simd_mask<N> mask = 1) {
  detail::LocalAccessorMarker acc;
  return detail::gather_impl<T, N>(acc, offsets, 0, mask);
}
 
template <typename T> __ESIMD_API T slm_scalar_load(uint32_t offset) {
  const simd<T, 1> Res = slm_gather<T, 1>(simd<uint32_t, 1>(offset));
  return Res[0];
}
 
template <typename T, int N>
__ESIMD_API std::enable_if_t<(N == 1 || N == 8 || N == 16 || N == 32) &&
                             (sizeof(T) <= 4)>
slm_scatter(simd<uint32_t, N> offsets, simd<T, N> vals, simd_mask<N> mask = 1) {
  detail::LocalAccessorMarker acc;
  detail::scatter_impl<T, N>(acc, vals, offsets, 0, mask);
}
 
template <typename T>
__ESIMD_API void slm_scalar_store(uint32_t offset, T val) {
  slm_scatter<T, 1>(simd<uint32_t, 1>(offset), simd<T, 1>(val), 1);
}
 
template <typename T, int N, rgba_channel_mask RGBAMask>
__ESIMD_API std::enable_if_t<(N == 8 || N == 16 || N == 32) && (sizeof(T) == 4),
                             simd<T, N * get_num_channels_enabled(RGBAMask)>>
slm_gather_rgba(simd<uint32_t, N> offsets, simd_mask<N> mask = 1) {
 
  const auto SI = __ESIMD_GET_SURF_HANDLE(detail::LocalAccessorMarker());
  return __esimd_gather4_masked_scaled2<T, N, RGBAMask>(
      SI, 0 /*global_offset*/, offsets.data(), mask.data());
}
 
template <typename T, int N, rgba_channel_mask Mask>
__ESIMD_API std::enable_if_t<(N == 8 || N == 16 || N == 32) && (sizeof(T) == 4)>
slm_scatter_rgba(simd<uint32_t, N> offsets,
                 simd<T, N * get_num_channels_enabled(Mask)> vals,
                 simd_mask<N> mask = 1) {
  detail::validate_rgba_write_channel_mask<Mask>();
  const auto si = __ESIMD_GET_SURF_HANDLE(detail::LocalAccessorMarker());
  constexpr int16_t Scale = 0;
  constexpr int global_offset = 0;
  __esimd_scatter4_scaled<T, N, decltype(si), Mask, Scale>(
      mask.data(), si, global_offset, offsets.data(), vals.data());
}
 
template <typename T, int N>
__ESIMD_API simd<T, N> slm_block_load(uint32_t offset) {
  constexpr unsigned Sz = sizeof(T) * N;
  static_assert(Sz >= detail::OperandSize::OWORD,
                "block size must be at least 1 oword");
  static_assert(Sz % detail::OperandSize::OWORD == 0,
                "block size must be whole number of owords");
  static_assert(detail::isPowerOf2(Sz / detail::OperandSize::OWORD),
                "block must be 1, 2, 4 or 8 owords long");
  static_assert(Sz <= 16 * detail::OperandSize::OWORD,
                "block size must be at most 16 owords");
 
  const auto si = __ESIMD_GET_SURF_HANDLE(detail::LocalAccessorMarker());
  return __esimd_oword_ld<detail::__raw_t<T>, N>(si, offset >> 4);
}
 
template <typename T, int N>
__ESIMD_API void slm_block_store(uint32_t offset, simd<T, N> vals) {
  constexpr unsigned Sz = sizeof(T) * N;
  static_assert(Sz >= detail::OperandSize::OWORD,
                "block size must be at least 1 oword");
  static_assert(Sz % detail::OperandSize::OWORD == 0,
                "block size must be whole number of owords");
  static_assert(detail::isPowerOf2(Sz / detail::OperandSize::OWORD),
                "block must be 1, 2, 4 or 8 owords long");
  static_assert(Sz <= 8 * detail::OperandSize::OWORD,
                "block size must be at most 8 owords");
  const auto si = __ESIMD_GET_SURF_HANDLE(detail::LocalAccessorMarker());
  // offset in genx.oword.st is in owords
  __esimd_oword_st<detail::__raw_t<T>, N>(si, offset >> 4, vals.data());
}
 
template <atomic_op Op, typename Tx, int N, class T = detail::__raw_t<Tx>>
__ESIMD_API std::enable_if_t<detail::check_atomic<Op, T, N, 0>(), simd<Tx, N>>
slm_atomic_update(simd<uint32_t, N> offsets, simd_mask<N> mask) {
  const auto si = __ESIMD_GET_SURF_HANDLE(detail::LocalAccessorMarker());
  return __esimd_dword_atomic0<Op, T, N>(mask.data(), si, offsets.data());
}
 
template <atomic_op Op, typename Tx, int N, class T = detail::__raw_t<Tx>>
__ESIMD_API std::enable_if_t<detail::check_atomic<Op, T, N, 1>(), simd<Tx, N>>
slm_atomic_update(simd<uint32_t, N> offsets, simd<Tx, N> src0,
                  simd_mask<N> mask) {
  const auto si = __ESIMD_GET_SURF_HANDLE(detail::LocalAccessorMarker());
  return __esimd_dword_atomic1<Op, T, N>(mask.data(), si, offsets.data(),
                                         src0.data());
}
 
template <atomic_op Op, typename Tx, int N, class T = detail::__raw_t<Tx>>
__ESIMD_API std::enable_if_t<detail::check_atomic<Op, T, N, 2>(), simd<Tx, N>>
slm_atomic_update(simd<uint32_t, N> offsets, simd<Tx, N> src0, simd<Tx, N> src1,
                  simd_mask<N> mask) {
  const auto si = __ESIMD_GET_SURF_HANDLE(detail::LocalAccessorMarker());
  return __esimd_dword_atomic2<Op, T, N>(mask.data(), si, offsets.data(),
                                         src0.data(), src1.data());
}
 
 
#ifndef __ESIMD_FORCE_STATELESS_MEM
 
template <typename T, int m, int N, typename AccessorTy, unsigned plane = 0>
__ESIMD_API simd<T, m * N> media_block_load(AccessorTy acc, unsigned x,
                                            unsigned y) {
  constexpr unsigned Width = N * sizeof(T);
  static_assert(Width * m <= 256u,
                "data does not fit into a single dataport transaction");
  static_assert(Width <= 64u, "valid block width is in range [1, 64]");
  static_assert(m <= 64u, "valid block height is in range [1, 64]");
  static_assert(plane <= 3u, "valid plane index is in range [0, 3]");
 
  const auto si = __ESIMD_GET_SURF_HANDLE(acc);
  using SurfIndTy = decltype(si);
  constexpr unsigned int RoundedWidth =
      Width < 4 ? 4 : detail::getNextPowerOf2<Width>();
  constexpr int BlockWidth = sizeof(T) * N;
  constexpr int Mod = 0;
 
  if constexpr (Width < RoundedWidth) {
    constexpr unsigned int n1 = RoundedWidth / sizeof(T);
    simd<T, m *n1> temp =
        __esimd_media_ld<T, m, n1, Mod, SurfIndTy, (int)plane, BlockWidth>(
            si, x, y);
    return temp.template select<m, 1, N, 1>(0, 0);
  } else {
    return __esimd_media_ld<T, m, N, Mod, SurfIndTy, (int)plane, BlockWidth>(
        si, x, y);
  }
}
 
template <typename T, int m, int N, typename AccessorTy, unsigned plane = 0>
__ESIMD_API void media_block_store(AccessorTy acc, unsigned x, unsigned y,
                                   simd<T, m * N> vals) {
  constexpr unsigned Width = N * sizeof(T);
  static_assert(Width * m <= 256u,
                "data does not fit into a single dataport transaction");
  static_assert(Width <= 64u, "valid block width is in range [1, 64]");
  static_assert(m <= 64u, "valid block height is in range [1, 64]");
  static_assert(plane <= 3u, "valid plane index is in range [0, 3]");
  const auto si = __ESIMD_GET_SURF_HANDLE(acc);
  using SurfIndTy = decltype(si);
  constexpr unsigned int RoundedWidth =
      Width < 4 ? 4 : detail::getNextPowerOf2<Width>();
  constexpr unsigned int n1 = RoundedWidth / sizeof(T);
  constexpr int BlockWidth = sizeof(T) * N;
  constexpr int Mod = 0;
 
  if constexpr (Width < RoundedWidth) {
    simd<T, m * n1> temp;
    auto temp_ref = temp.template bit_cast_view<T, m, n1>();
    auto vals_ref = vals.template bit_cast_view<T, m, N>();
    temp_ref.template select<m, 1, N, 1>() = vals_ref;
    __esimd_media_st<T, m, n1, Mod, SurfIndTy, plane, BlockWidth>(si, x, y,
                                                                  temp.data());
  } else {
    __esimd_media_st<T, m, N, Mod, SurfIndTy, plane, BlockWidth>(si, x, y,
                                                                 vals.data());
  }
}
#endif // !__ESIMD_FORCE_STATELESS_MEM
 
 
#undef __ESIMD_GET_SURF_HANDLE
 
 
namespace detail {
 
// ----- Outlined implementations of simd_obj_impl class memory access APIs.
 
template <typename T, int N, class T1, class SFINAE>
template <typename Flags, int ChunkSize, typename>
void simd_obj_impl<T, N, T1, SFINAE>::copy_from(
    const simd_obj_impl<T, N, T1, SFINAE>::element_type *Addr,
    Flags) SYCL_ESIMD_FUNCTION {
  using UT = simd_obj_impl<T, N, T1, SFINAE>::element_type;
  constexpr unsigned Size = sizeof(T) * N;
  constexpr unsigned Align = Flags::template alignment<T1>;
 
  constexpr unsigned BlockSize = OperandSize::OWORD * 8;
  constexpr unsigned NumBlocks = Size / BlockSize;
  constexpr unsigned RemSize = Size % BlockSize;
 
  if constexpr (Align >= OperandSize::DWORD && Size % OperandSize::OWORD == 0 &&
                detail::isPowerOf2(RemSize / OperandSize::OWORD)) {
    if constexpr (NumBlocks > 0) {
      constexpr unsigned BlockN = BlockSize / sizeof(T);
      ForHelper<NumBlocks>::unroll([BlockN, Addr, this](unsigned Block) {
        select<BlockN, 1>(Block * BlockN) =
            block_load<UT, BlockN, Flags>(Addr + (Block * BlockN), Flags{});
      });
    }
    if constexpr (RemSize > 0) {
      constexpr unsigned RemN = RemSize / sizeof(T);
      constexpr unsigned BlockN = BlockSize / sizeof(T);
      select<RemN, 1>(NumBlocks * BlockN) =
          block_load<UT, RemN, Flags>(Addr + (NumBlocks * BlockN), Flags{});
    }
  } else if constexpr (sizeof(T) == 8) {
    simd<int32_t, N * 2> BC(reinterpret_cast<const int32_t *>(Addr), Flags{});
    bit_cast_view<int32_t>() = BC;
  } else {
    constexpr unsigned NumChunks = N / ChunkSize;
    if constexpr (NumChunks > 0) {
      simd<uint32_t, ChunkSize> Offsets(0u, sizeof(T));
      ForHelper<NumChunks>::unroll([Addr, &Offsets, this](unsigned Block) {
        select<ChunkSize, 1>(Block * ChunkSize) =
            gather<UT, ChunkSize>(Addr + (Block * ChunkSize), Offsets);
      });
    }
    constexpr unsigned RemN = N % ChunkSize;
    if constexpr (RemN > 0) {
      if constexpr (RemN == 1) {
        select<1, 1>(NumChunks * ChunkSize) = Addr[NumChunks * ChunkSize];
      } else if constexpr (RemN == 8 || RemN == 16) {
        simd<uint32_t, RemN> Offsets(0u, sizeof(T));
        select<RemN, 1>(NumChunks * ChunkSize) =
            gather<UT, RemN>(Addr + (NumChunks * ChunkSize), Offsets);
      } else {
        constexpr int N1 = RemN < 8 ? 8 : RemN < 16 ? 16 : 32;
        simd_mask_type<N1> Pred(0);
        Pred.template select<RemN, 1>() = 1;
        simd<uint32_t, N1> Offsets(0u, sizeof(T));
        simd<UT, N1> Vals =
            gather<UT, N1>(Addr + (NumChunks * ChunkSize), Offsets, Pred);
        select<RemN, 1>(NumChunks * ChunkSize) =
            Vals.template select<RemN, 1>();
      }
    }
  }
}
 
template <typename T, int N, class T1, class SFINAE>
template <typename AccessorT, typename Flags, int ChunkSize, typename>
ESIMD_INLINE EnableIfAccessor<AccessorT, accessor_mode_cap::can_read,
                              sycl::access::target::device, void>
simd_obj_impl<T, N, T1, SFINAE>::copy_from(AccessorT acc, uint32_t offset,
                                           Flags) SYCL_ESIMD_FUNCTION {
  using UT = simd_obj_impl<T, N, T1, SFINAE>::element_type;
  static_assert(sizeof(UT) == sizeof(T));
  constexpr unsigned Size = sizeof(T) * N;
  constexpr unsigned Align = Flags::template alignment<T1>;
 
  constexpr unsigned BlockSize = OperandSize::OWORD * 8;
  constexpr unsigned NumBlocks = Size / BlockSize;
  constexpr unsigned RemSize = Size % BlockSize;
 
  if constexpr (Align >= OperandSize::DWORD && Size % OperandSize::OWORD == 0 &&
                detail::isPowerOf2(RemSize / OperandSize::OWORD)) {
    if constexpr (NumBlocks > 0) {
      constexpr unsigned BlockN = BlockSize / sizeof(T);
      ForHelper<NumBlocks>::unroll([BlockN, acc, offset, this](unsigned Block) {
        select<BlockN, 1>(Block * BlockN) =
            block_load<UT, BlockN, AccessorT, Flags>(
                acc, offset + (Block * BlockSize), Flags{});
      });
    }
    if constexpr (RemSize > 0) {
      constexpr unsigned RemN = RemSize / sizeof(T);
      constexpr unsigned BlockN = BlockSize / sizeof(T);
      select<RemN, 1>(NumBlocks * BlockN) =
          block_load<UT, RemN, AccessorT, Flags>(
              acc, offset + (NumBlocks * BlockSize), Flags{});
    }
  } else if constexpr (sizeof(T) == 8) {
    simd<int32_t, N * 2> BC(acc, offset, Flags{});
    bit_cast_view<int32_t>() = BC;
  } else {
    constexpr unsigned NumChunks = N / ChunkSize;
    if constexpr (NumChunks > 0) {
      simd<uint32_t, ChunkSize> Offsets(0u, sizeof(T));
      ForHelper<NumChunks>::unroll(
          [acc, offset, &Offsets, this](unsigned Block) {
            select<ChunkSize, 1>(Block * ChunkSize) =
                gather<UT, ChunkSize, AccessorT>(
                    acc, Offsets, offset + (Block * ChunkSize * sizeof(T)));
          });
    }
    constexpr unsigned RemN = N % ChunkSize;
    if constexpr (RemN > 0) {
      if constexpr (RemN == 1 || RemN == 8 || RemN == 16) {
        simd<uint32_t, RemN> Offsets(0u, sizeof(T));
        select<RemN, 1>(NumChunks * ChunkSize) = gather<UT, RemN, AccessorT>(
            acc, Offsets, offset + (NumChunks * ChunkSize * sizeof(T)));
      } else {
        constexpr int N1 = RemN < 8 ? 8 : RemN < 16 ? 16 : 32;
        simd_mask_type<N1> Pred(0);
        Pred.template select<RemN, 1>() = 1;
        simd<uint32_t, N1> Offsets(0u, sizeof(T));
        simd<UT, N1> Vals = gather<UT, N1>(
            acc, Offsets, offset + (NumChunks * ChunkSize * sizeof(T)), Pred);
        select<RemN, 1>(NumChunks * ChunkSize) =
            Vals.template select<RemN, 1>();
      }
    }
  }
}
 
template <typename T, int N, class T1, class SFINAE>
template <typename Flags, int ChunkSize, typename>
void simd_obj_impl<T, N, T1, SFINAE>::copy_to(
    simd_obj_impl<T, N, T1, SFINAE>::element_type *Addr,
    Flags) const SYCL_ESIMD_FUNCTION {
  using UT = simd_obj_impl<T, N, T1, SFINAE>::element_type;
  constexpr unsigned Size = sizeof(T) * N;
  constexpr unsigned Align = Flags::template alignment<T1>;
 
  constexpr unsigned BlockSize = OperandSize::OWORD * 8;
  constexpr unsigned NumBlocks = Size / BlockSize;
  constexpr unsigned RemSize = Size % BlockSize;
 
  simd<UT, N> Tmp{data()};
  if constexpr (Align >= OperandSize::OWORD && Size % OperandSize::OWORD == 0 &&
                detail::isPowerOf2(RemSize / OperandSize::OWORD)) {
    if constexpr (NumBlocks > 0) {
      constexpr unsigned BlockN = BlockSize / sizeof(T);
      ForHelper<NumBlocks>::unroll([BlockN, Addr, &Tmp](unsigned Block) {
        block_store<UT, BlockN>(Addr + (Block * BlockN),
                                Tmp.template select<BlockN, 1>(Block * BlockN));
      });
    }
    if constexpr (RemSize > 0) {
      constexpr unsigned RemN = RemSize / sizeof(T);
      constexpr unsigned BlockN = BlockSize / sizeof(T);
      block_store<UT, RemN>(Addr + (NumBlocks * BlockN),
                            Tmp.template select<RemN, 1>(NumBlocks * BlockN));
    }
  } else if constexpr (sizeof(T) == 8) {
    simd<int32_t, N * 2> BC = Tmp.template bit_cast_view<int32_t>();
    BC.copy_to(reinterpret_cast<int32_t *>(Addr), Flags{});
  } else {
    constexpr unsigned NumChunks = N / ChunkSize;
    if constexpr (NumChunks > 0) {
      simd<uint32_t, ChunkSize> Offsets(0u, sizeof(T));
      ForHelper<NumChunks>::unroll([Addr, &Offsets, &Tmp](unsigned Block) {
        scatter<UT, ChunkSize>(
            Addr + (Block * ChunkSize), Offsets,
            Tmp.template select<ChunkSize, 1>(Block * ChunkSize));
      });
    }
    constexpr unsigned RemN = N % ChunkSize;
    if constexpr (RemN > 0) {
      if constexpr (RemN == 1) {
        Addr[NumChunks * ChunkSize] = Tmp[NumChunks * ChunkSize];
      } else if constexpr (RemN == 8 || RemN == 16) {
        simd<uint32_t, RemN> Offsets(0u, sizeof(T));
        scatter<UT, RemN>(Addr + (NumChunks * ChunkSize), Offsets,
                          Tmp.template select<RemN, 1>(NumChunks * ChunkSize));
      } else {
        constexpr int N1 = RemN < 8 ? 8 : RemN < 16 ? 16 : 32;
        simd_mask_type<N1> Pred(0);
        Pred.template select<RemN, 1>() = 1;
        simd<UT, N1> Vals;
        Vals.template select<RemN, 1>() =
            Tmp.template select<RemN, 1>(NumChunks * ChunkSize);
        simd<uint32_t, N1> Offsets(0u, sizeof(T));
        scatter<UT, N1>(Addr + (NumChunks * ChunkSize), Offsets, Vals, Pred);
      }
    }
  }
}
 
template <typename T, int N, class T1, class SFINAE>
template <typename AccessorT, typename Flags, int ChunkSize, typename>
ESIMD_INLINE EnableIfAccessor<AccessorT, accessor_mode_cap::can_write,
                              sycl::access::target::device, void>
simd_obj_impl<T, N, T1, SFINAE>::copy_to(AccessorT acc, uint32_t offset,
                                         Flags) const SYCL_ESIMD_FUNCTION {
  using UT = simd_obj_impl<T, N, T1, SFINAE>::element_type;
  constexpr unsigned Size = sizeof(T) * N;
  constexpr unsigned Align = Flags::template alignment<T1>;
 
  constexpr unsigned BlockSize = OperandSize::OWORD * 8;
  constexpr unsigned NumBlocks = Size / BlockSize;
  constexpr unsigned RemSize = Size % BlockSize;
 
  simd<UT, N> Tmp{data()};
 
  if constexpr (Align >= OperandSize::OWORD && Size % OperandSize::OWORD == 0 &&
                detail::isPowerOf2(RemSize / OperandSize::OWORD)) {
    if constexpr (NumBlocks > 0) {
      constexpr unsigned BlockN = BlockSize / sizeof(T);
      ForHelper<NumBlocks>::unroll([BlockN, acc, offset, &Tmp](unsigned Block) {
        block_store<UT, BlockN, AccessorT>(
            acc, offset + (Block * BlockSize),
            Tmp.template select<BlockN, 1>(Block * BlockN));
      });
    }
    if constexpr (RemSize > 0) {
      constexpr unsigned RemN = RemSize / sizeof(T);
      constexpr unsigned BlockN = BlockSize / sizeof(T);
      block_store<UT, RemN, AccessorT>(
          acc, offset + (NumBlocks * BlockSize),
          Tmp.template select<RemN, 1>(NumBlocks * BlockN));
    }
  } else if constexpr (sizeof(T) == 8) {
    simd<int32_t, N * 2> BC = Tmp.template bit_cast_view<int32_t>();
    BC.copy_to(acc, offset, Flags{});
  } else {
    constexpr unsigned NumChunks = N / ChunkSize;
    if constexpr (NumChunks > 0) {
      simd<uint32_t, ChunkSize> Offsets(0u, sizeof(T));
      ForHelper<NumChunks>::unroll([acc, offset, &Offsets,
                                    &Tmp](unsigned Block) {
        scatter<UT, ChunkSize, AccessorT>(
            acc, Offsets, Tmp.template select<ChunkSize, 1>(Block * ChunkSize),
            offset + (Block * ChunkSize * sizeof(T)));
      });
    }
    constexpr unsigned RemN = N % ChunkSize;
    if constexpr (RemN > 0) {
      if constexpr (RemN == 1 || RemN == 8 || RemN == 16) {
        simd<uint32_t, RemN> Offsets(0u, sizeof(T));
        scatter<UT, RemN, AccessorT>(
            acc, Offsets, Tmp.template select<RemN, 1>(NumChunks * ChunkSize),
            offset + (NumChunks * ChunkSize * sizeof(T)));
      } else {
        constexpr int N1 = RemN < 8 ? 8 : RemN < 16 ? 16 : 32;
        simd_mask_type<N1> Pred(0);
        Pred.template select<RemN, 1>() = 1;
        simd<UT, N1> Vals;
        Vals.template select<RemN, 1>() =
            Tmp.template select<RemN, 1>(NumChunks * ChunkSize);
        simd<uint32_t, N1> Offsets(0u, sizeof(T));
        scatter<UT, N1, AccessorT>(acc, Offsets, Vals,
                                   offset + (NumChunks * ChunkSize * sizeof(T)),
                                   Pred);
      }
    }
  }
}
 
} // namespace detail
 
} // namespace __ESIMD_NS
} // __SYCL_INLINE_NAMESPACE(cl)