xref: /aosp_15_r20/external/llvm-libc/src/string/memory_utils/inline_memmove.h (revision 71db0c75aadcf003ffe3238005f61d7618a3fead)
1 //===-- Memmove implementation ----------------------------------*- 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 
9 #ifndef LLVM_LIBC_SRC_STRING_MEMORY_UTILS_INLINE_MEMMOVE_H
10 #define LLVM_LIBC_SRC_STRING_MEMORY_UTILS_INLINE_MEMMOVE_H
11 
12 #include "src/__support/macros/config.h"
13 #include <stddef.h> // size_t, ptrdiff_t
14 
15 #if defined(LIBC_TARGET_ARCH_IS_X86)
16 #include "src/string/memory_utils/x86_64/inline_memmove.h"
17 #define LIBC_SRC_STRING_MEMORY_UTILS_MEMMOVE_SMALL_SIZE                        \
18   inline_memmove_small_size_x86
19 #define LIBC_SRC_STRING_MEMORY_UTILS_MEMMOVE_FOLLOW_UP                         \
20   inline_memmove_follow_up_x86
21 #elif defined(LIBC_TARGET_ARCH_IS_AARCH64)
22 #include "src/string/memory_utils/aarch64/inline_memmove.h"
23 #define LIBC_SRC_STRING_MEMORY_UTILS_MEMMOVE_SMALL_SIZE                        \
24   inline_memmove_no_small_size
25 #define LIBC_SRC_STRING_MEMORY_UTILS_MEMMOVE_FOLLOW_UP inline_memmove_aarch64
26 #elif defined(LIBC_TARGET_ARCH_IS_ANY_RISCV)
27 #include "src/string/memory_utils/riscv/inline_memmove.h"
28 #define LIBC_SRC_STRING_MEMORY_UTILS_MEMMOVE_SMALL_SIZE                        \
29   inline_memmove_no_small_size
30 #define LIBC_SRC_STRING_MEMORY_UTILS_MEMMOVE_FOLLOW_UP inline_memmove_riscv
31 #elif defined(LIBC_TARGET_ARCH_IS_ARM)
32 #include "src/string/memory_utils/generic/byte_per_byte.h"
33 #define LIBC_SRC_STRING_MEMORY_UTILS_MEMMOVE_SMALL_SIZE                        \
34   inline_memmove_no_small_size
35 #define LIBC_SRC_STRING_MEMORY_UTILS_MEMMOVE_FOLLOW_UP                         \
36   inline_memmove_byte_per_byte
37 #elif defined(LIBC_TARGET_ARCH_IS_GPU)
38 #include "src/string/memory_utils/generic/builtin.h"
39 #define LIBC_SRC_STRING_MEMORY_UTILS_MEMMOVE_SMALL_SIZE                        \
40   inline_memmove_no_small_size
41 #define LIBC_SRC_STRING_MEMORY_UTILS_MEMMOVE_FOLLOW_UP inline_memmove_builtin
42 #else
43 #error "Unsupported architecture"
44 #endif
45 
46 namespace LIBC_NAMESPACE_DECL {
47 
inline_memmove_no_small_size(void *,const void *,size_t)48 LIBC_INLINE constexpr bool inline_memmove_no_small_size(void *, const void *,
49                                                         size_t) {
50   return false;
51 }
52 
53 [[gnu::flatten]] LIBC_INLINE bool
inline_memmove_small_size(void * dst,const void * src,size_t count)54 inline_memmove_small_size(void *dst, const void *src, size_t count) {
55   return LIBC_SRC_STRING_MEMORY_UTILS_MEMMOVE_SMALL_SIZE(
56       reinterpret_cast<Ptr>(dst), reinterpret_cast<CPtr>(src), count);
57 }
58 
59 [[gnu::flatten]] LIBC_INLINE void
inline_memmove_follow_up(void * dst,const void * src,size_t count)60 inline_memmove_follow_up(void *dst, const void *src, size_t count) {
61   LIBC_SRC_STRING_MEMORY_UTILS_MEMMOVE_FOLLOW_UP(
62       reinterpret_cast<Ptr>(dst), reinterpret_cast<CPtr>(src), count);
63 }
64 
inline_memmove(void * dst,const void * src,size_t count)65 LIBC_INLINE void inline_memmove(void *dst, const void *src, size_t count) {
66   if (inline_memmove_small_size(dst, src, count))
67     return;
68   inline_memmove_follow_up(dst, src, count);
69 }
70 
71 } // namespace LIBC_NAMESPACE_DECL
72 
73 #endif /* LLVM_LIBC_SRC_STRING_MEMORY_UTILS_INLINE_MEMMOVE_H */
74