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//===-- Memcpy implementation -----------------------------------*- 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_MEMCPY_IMPLEMENTATIONS_H
#define LLVM_LIBC_SRC_STRING_MEMORY_UTILS_MEMCPY_IMPLEMENTATIONS_H
#include "src/__support/macros/config.h" // LIBC_INLINE
#include "src/__support/macros/optimization.h" // LIBC_LOOP_NOUNROLL
#include "src/__support/macros/properties/architectures.h"
#include "src/string/memory_utils/op_builtin.h"
#include "src/string/memory_utils/utils.h"
#include <stddef.h> // size_t
#if defined(LIBC_TARGET_ARCH_IS_X86)
#include "src/string/memory_utils/x86_64/memcpy_implementations.h"
#elif defined(LIBC_TARGET_ARCH_IS_AARCH64)
#include "src/string/memory_utils/aarch64/memcpy_implementations.h"
#endif
namespace __llvm_libc {
[[maybe_unused]] LIBC_INLINE void
inline_memcpy_byte_per_byte(Ptr dst, CPtr src, size_t offset, size_t count) {
LIBC_LOOP_NOUNROLL
for (; offset < count; ++offset)
dst[offset] = src[offset];
}
[[maybe_unused]] LIBC_INLINE void
inline_memcpy_aligned_access_32bit(Ptr __restrict dst, CPtr __restrict src,
size_t count) {
constexpr size_t kAlign = sizeof(uint32_t);
if (count <= 2 * kAlign)
return inline_memcpy_byte_per_byte(dst, src, 0, count);
size_t bytes_to_dst_align = distance_to_align_up<kAlign>(dst);
inline_memcpy_byte_per_byte(dst, src, 0, bytes_to_dst_align);
size_t offset = bytes_to_dst_align;
size_t src_alignment = distance_to_align_down<kAlign>(src + offset);
for (; offset < count - kAlign; offset += kAlign) {
uint32_t value;
if (src_alignment == 0)
value = load32_aligned<uint32_t>(src, offset);
else if (src_alignment == 2)
value = load32_aligned<uint16_t, uint16_t>(src, offset);
else
value = load32_aligned<uint8_t, uint16_t, uint8_t>(src, offset);
store32_aligned<uint32_t>(value, dst, offset);
}
// remainder
inline_memcpy_byte_per_byte(dst, src, offset, count);
}
[[maybe_unused]] LIBC_INLINE void
inline_memcpy_aligned_access_64bit(Ptr __restrict dst, CPtr __restrict src,
size_t count) {
constexpr size_t kAlign = sizeof(uint64_t);
if (count <= 2 * kAlign)
return inline_memcpy_byte_per_byte(dst, src, 0, count);
size_t bytes_to_dst_align = distance_to_align_up<kAlign>(dst);
inline_memcpy_byte_per_byte(dst, src, 0, bytes_to_dst_align);
size_t offset = bytes_to_dst_align;
size_t src_alignment = distance_to_align_down<kAlign>(src + offset);
for (; offset < count - kAlign; offset += kAlign) {
uint64_t value;
if (src_alignment == 0)
value = load64_aligned<uint64_t>(src, offset);
else if (src_alignment == 4)
value = load64_aligned<uint32_t, uint32_t>(src, offset);
else if (src_alignment == 2)
value =
load64_aligned<uint16_t, uint16_t, uint16_t, uint16_t>(src, offset);
else
value = load64_aligned<uint8_t, uint16_t, uint16_t, uint16_t, uint8_t>(
src, offset);
store64_aligned<uint64_t>(value, dst, offset);
}
// remainder
inline_memcpy_byte_per_byte(dst, src, offset, count);
}
LIBC_INLINE void inline_memcpy(Ptr __restrict dst, CPtr __restrict src,
size_t count) {
using namespace __llvm_libc::builtin;
#if defined(LIBC_COPT_MEMCPY_USE_EMBEDDED_TINY)
return inline_memcpy_byte_per_byte(dst, src, 0, count);
#elif defined(LIBC_TARGET_ARCH_IS_X86)
return inline_memcpy_x86_maybe_interpose_repmovsb(dst, src, count);
#elif defined(LIBC_TARGET_ARCH_IS_AARCH64)
return inline_memcpy_aarch64(dst, src, count);
#elif defined(LIBC_TARGET_ARCH_IS_RISCV64)
return inline_memcpy_aligned_access_64bit(dst, src, count);
#elif defined(LIBC_TARGET_ARCH_IS_RISCV32)
return inline_memcpy_aligned_access_32bit(dst, src, count);
#else
return inline_memcpy_byte_per_byte(dst, src, 0, count);
#endif
}
LIBC_INLINE void inline_memcpy(void *__restrict dst, const void *__restrict src,
size_t count) {
inline_memcpy(reinterpret_cast<Ptr>(dst), reinterpret_cast<CPtr>(src), count);
}
} // namespace __llvm_libc
#endif // LLVM_LIBC_SRC_STRING_MEMORY_UTILS_MEMCPY_IMPLEMENTATIONS_H
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