llvm/libc/src/string/memory_utils/x86_64/inline_memset.h

//===-- Memset implementation for x86_64 ------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIBC_SRC_STRING_MEMORY_UTILS_X86_64_INLINE_MEMSET_H
#define LLVM_LIBC_SRC_STRING_MEMORY_UTILS_X86_64_INLINE_MEMSET_H

#include "src/__support/macros/attributes.h" // LIBC_INLINE
#include "src/__support/macros/config.h"
#include "src/string/memory_utils/op_generic.h"
#include "src/string/memory_utils/op_x86.h"
#include "src/string/memory_utils/utils.h" // Ptr, CPtr

#include <stddef.h> // size_t

namespace LIBC_NAMESPACE_DECL {
namespace x86 {
// Size of one cache line for software prefetching
LIBC_INLINE_VAR constexpr size_t K_ONE_CACHELINE_SIZE = …;
LIBC_INLINE_VAR constexpr size_t K_TWO_CACHELINES_SIZE = …;
LIBC_INLINE_VAR constexpr size_t K_FIVE_CACHELINES_SIZE = …;

LIBC_INLINE_VAR constexpr bool K_USE_SOFTWARE_PREFETCHING_MEMSET = …;

} // namespace x86

#if defined(__AVX512F__)
using uint128_t = generic_v128;
using uint256_t = generic_v256;
using uint512_t = generic_v512;
#elif defined(__AVX__)
using uint128_t = generic_v128;
using uint256_t = generic_v256;
using uint512_t = cpp::array<generic_v256, 2>;
#elif defined(__SSE2__)
uint128_t;
uint256_t;
uint512_t;
#else
using uint128_t = cpp::array<uint64_t, 2>;
using uint256_t = cpp::array<uint64_t, 4>;
using uint512_t = cpp::array<uint64_t, 8>;
#endif

[[maybe_unused]] LIBC_INLINE static void
inline_memset_x86_gt64_sw_prefetching(Ptr dst, uint8_t value, size_t count) { … }

[[maybe_unused]] LIBC_INLINE static void
inline_memset_x86(Ptr dst, uint8_t value, size_t count) { … }
} // namespace LIBC_NAMESPACE_DECL

#endif // LLVM_LIBC_SRC_STRING_MEMORY_UTILS_X86_64_INLINE_MEMSET_H