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| 1 | //===-- Memmove implementation for aarch64 ----------------------*- C++ -*-===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | #ifndef LIBC_SRC_STRING_MEMORY_UTILS_AARCH64_INLINE_MEMMOVE_H |
| 9 | #define LIBC_SRC_STRING_MEMORY_UTILS_AARCH64_INLINE_MEMMOVE_H |
| 10 | |
| 11 | #include "src/__support/macros/attributes.h" // LIBC_INLINE |
| 12 | #include "src/string/memory_utils/op_builtin.h" |
| 13 | #include "src/string/memory_utils/op_generic.h" |
| 14 | #include "src/string/memory_utils/utils.h" |
| 15 | |
| 16 | #include <stddef.h> // size_t |
| 17 | |
| 18 | namespace LIBC_NAMESPACE_DECL { |
| 19 | |
| 20 | LIBC_INLINE void inline_memmove_aarch64(Ptr dst, CPtr src, size_t count) { |
| 21 | using uint128_t = generic_v128; |
| 22 | using uint256_t = generic_v256; |
| 23 | using uint512_t = generic_v512; |
| 24 | if (count == 0) |
| 25 | return; |
| 26 | if (count == 1) |
| 27 | return generic::Memmove<uint8_t>::block(dst, src); |
| 28 | if (count <= 4) |
| 29 | return generic::Memmove<uint16_t>::head_tail(dst, src, count); |
| 30 | if (count <= 8) |
| 31 | return generic::Memmove<uint32_t>::head_tail(dst, src, count); |
| 32 | if (count <= 16) |
| 33 | return generic::Memmove<uint64_t>::head_tail(dst, src, count); |
| 34 | if (count <= 32) |
| 35 | return generic::Memmove<uint128_t>::head_tail(dst, src, count); |
| 36 | if (count <= 64) |
| 37 | return generic::Memmove<uint256_t>::head_tail(dst, src, count); |
| 38 | if (count <= 128) |
| 39 | return generic::Memmove<uint512_t>::head_tail(dst, src, count); |
| 40 | if (dst < src) { |
| 41 | generic::Memmove<uint256_t>::align_forward<Arg::Src>(dst, src, count); |
| 42 | return generic::Memmove<uint512_t>::loop_and_tail_forward(dst, src, count); |
| 43 | } else { |
| 44 | generic::Memmove<uint256_t>::align_backward<Arg::Src>(dst, src, count); |
| 45 | return generic::Memmove<uint512_t>::loop_and_tail_backward(dst, src, count); |
| 46 | } |
| 47 | } |
| 48 | |
| 49 | } // namespace LIBC_NAMESPACE_DECL |
| 50 | |
| 51 | #endif // LIBC_SRC_STRING_MEMORY_UTILS_AARCH64_INLINE_MEMMOVE_H |
| 52 |
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