1 //===-- Implementation of memset_explicit ---------------------------------===// 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 #include "src/string/memset_explicit.h" 10 #include "src/__support/common.h" 11 #include "src/__support/macros/config.h" 12 #include "src/string/memory_utils/inline_memset.h" 13 14 namespace LIBC_NAMESPACE_DECL { 15 16 [[gnu::noinline]] LLVM_LIBC_FUNCTION(void *, memset_explicit, 17 (void *dst, int value, size_t count)) { 18 // Use the inline memset function to set the memory. 19 inline_memset(dst, static_cast<uint8_t>(value), count); 20 // avoid dead store elimination 21 // The asm itself should also be sufficient to behave as a compiler barrier. 22 asm("" : : "r"(dst) : "memory"); 23 return dst; 24 } 25 26 } // namespace LIBC_NAMESPACE_DECL 27