99 lines
3.5 KiB
C++
99 lines
3.5 KiB
C++
//===-- Memmove implementation ----------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIBC_SRC_STRING_MEMORY_UTILS_MEMMOVE_IMPLEMENTATIONS_H
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#define LLVM_LIBC_SRC_STRING_MEMORY_UTILS_MEMMOVE_IMPLEMENTATIONS_H
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#include "src/__support/common.h"
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#include "src/__support/macros/optimization.h"
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#include "src/string/memory_utils/op_aarch64.h"
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#include "src/string/memory_utils/op_builtin.h"
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#include "src/string/memory_utils/op_generic.h"
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#include "src/string/memory_utils/op_x86.h"
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#include <stddef.h> // size_t, ptrdiff_t
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namespace __llvm_libc {
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[[maybe_unused]] LIBC_INLINE void
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inline_memmove_embedded_tiny(Ptr dst, CPtr src, size_t count) {
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if ((count == 0) || (dst == src))
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return;
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if (dst < src) {
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LIBC_LOOP_NOUNROLL
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for (size_t offset = 0; offset < count; ++offset)
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builtin::Memcpy<1>::block(dst + offset, src + offset);
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} else {
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LIBC_LOOP_NOUNROLL
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for (ptrdiff_t offset = count - 1; offset >= 0; --offset)
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builtin::Memcpy<1>::block(dst + offset, src + offset);
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}
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}
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LIBC_INLINE void inline_memmove(Ptr dst, CPtr src, size_t count) {
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#if defined(LIBC_TARGET_ARCH_IS_X86) || defined(LIBC_TARGET_ARCH_IS_AARCH64)
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#if defined(LIBC_TARGET_ARCH_IS_X86)
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#if defined(__AVX512F__)
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using uint128_t = uint8x16_t;
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using uint256_t = uint8x32_t;
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using uint512_t = uint8x64_t;
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#elif defined(__AVX__)
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using uint128_t = uint8x16_t;
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using uint256_t = uint8x32_t;
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using uint512_t = cpp::array<uint8x32_t, 2>;
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#elif defined(__SSE2__)
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using uint128_t = uint8x16_t;
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using uint256_t = cpp::array<uint8x16_t, 2>;
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using uint512_t = cpp::array<uint8x16_t, 4>;
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#else
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using uint128_t = cpp::array<uint64_t, 2>;
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using uint256_t = cpp::array<uint64_t, 4>;
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using uint512_t = cpp::array<uint64_t, 8>;
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#endif
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#elif defined(LIBC_TARGET_ARCH_IS_AARCH64)
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static_assert(aarch64::kNeon, "aarch64 supports vector types");
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using uint128_t = uint8x16_t;
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using uint256_t = uint8x32_t;
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using uint512_t = uint8x64_t;
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#endif
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if (count == 0)
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return;
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if (count == 1)
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return generic::Memmove<uint8_t>::block(dst, src);
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if (count <= 4)
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return generic::Memmove<uint16_t>::head_tail(dst, src, count);
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if (count <= 8)
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return generic::Memmove<uint32_t>::head_tail(dst, src, count);
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if (count <= 16)
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return generic::Memmove<uint64_t>::head_tail(dst, src, count);
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if (count <= 32)
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return generic::Memmove<uint128_t>::head_tail(dst, src, count);
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if (count <= 64)
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return generic::Memmove<uint256_t>::head_tail(dst, src, count);
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if (count <= 128)
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return generic::Memmove<uint512_t>::head_tail(dst, src, count);
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if (dst < src) {
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generic::Memmove<uint256_t>::align_forward<Arg::Src>(dst, src, count);
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return generic::Memmove<uint512_t>::loop_and_tail_forward(dst, src, count);
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} else {
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generic::Memmove<uint256_t>::align_backward<Arg::Src>(dst, src, count);
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return generic::Memmove<uint512_t>::loop_and_tail_backward(dst, src, count);
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}
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#else
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return inline_memmove_embedded_tiny(dst, src, count);
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#endif
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}
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LIBC_INLINE void inline_memmove(void *dst, const void *src, size_t count) {
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inline_memmove(reinterpret_cast<Ptr>(dst), reinterpret_cast<CPtr>(src),
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count);
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}
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} // namespace __llvm_libc
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#endif /* LLVM_LIBC_SRC_STRING_MEMORY_UTILS_MEMMOVE_IMPLEMENTATIONS_H */
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