libc/src/string/memset_explicit.cpp

   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