| 1 | //===-- Implementation of memmove -----------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "src/string/memmove.h" |
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| 10 | #include "src/__support/macros/config.h" |
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| 11 | #include "src/__support/macros/null_check.h" |
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| 12 | #include "src/string/memory_utils/inline_memcpy.h" |
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| 13 | #include "src/string/memory_utils/inline_memmove.h" |
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| 14 | #include <stddef.h> // size_t |
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| 15 | |
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| 16 | namespace LIBC_NAMESPACE_DECL { |
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| 17 | |
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| 18 | LLVM_LIBC_FUNCTION(void *, memmove, |
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| 19 | (void *dst, const void *src, size_t count)) { |
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| 20 | if (count) { |
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| 21 | LIBC_CRASH_ON_NULLPTR(dst); |
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| 22 | LIBC_CRASH_ON_NULLPTR(src); |
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| 23 | } |
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| 24 | // Memmove may handle some small sizes as efficiently as inline_memcpy. |
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| 25 | // For these sizes we may not do is_disjoint check. |
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| 26 | // This both avoids additional code for the most frequent smaller sizes |
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| 27 | // and removes code bloat (we don't need the memcpy logic for small sizes). |
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| 28 | if (inline_memmove_small_size(dst, src, count)) |
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| 29 | return dst; |
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| 30 | if (is_disjoint(dst, src, count)) |
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| 31 | inline_memcpy(dst, src, count); |
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| 32 | else |
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| 33 | inline_memmove_follow_up(dst, src, count); |
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| 34 | return dst; |
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| 35 | } |
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| 36 | |
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| 37 | } // namespace LIBC_NAMESPACE_DECL |
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| 38 | |
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