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//===-- Implementation of memmove -----------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "src/string/memmove.h"
#include "src/__support/macros/config.h"
#include "src/__support/macros/null_check.h"
#include "src/string/memory_utils/inline_memcpy.h"
#include "src/string/memory_utils/inline_memmove.h"
#include <stddef.h> // size_t
namespace LIBC_NAMESPACE_DECL {
LLVM_LIBC_FUNCTION(void *, memmove,
(void *dst, const void *src, size_t count)) {
if (count) {
LIBC_CRASH_ON_NULLPTR(dst);
LIBC_CRASH_ON_NULLPTR(src);
}
// Memmove may handle some small sizes as efficiently as inline_memcpy.
// For these sizes we may not do is_disjoint check.
// This both avoids additional code for the most frequent smaller sizes
// and removes code bloat (we don't need the memcpy logic for small sizes).
if (inline_memmove_small_size(dst, src, count))
return dst;
if (is_disjoint(dst, src, count))
inline_memcpy(dst, src, count);
else
inline_memmove_follow_up(dst, src, count);
return dst;
}
} // namespace LIBC_NAMESPACE_DECL
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