1//===------- LibC.cpp - Simple implementation of libc functions --- 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#include "LibC.h"
10
11#if defined(__AMDGPU__) && !defined(OMPTARGET_HAS_LIBC)
12extern "C" int vprintf(const char *format, __builtin_va_list) { return -1; }
13#else
14extern "C" int vprintf(const char *format, __builtin_va_list);
15#endif
16
17extern "C" {
18[[gnu::weak]] int memcmp(const void *lhs, const void *rhs, size_t count) {
19 auto *L = reinterpret_cast<const unsigned char *>(lhs);
20 auto *R = reinterpret_cast<const unsigned char *>(rhs);
21
22 for (size_t I = 0; I < count; ++I)
23 if (L[I] != R[I])
24 return (int)L[I] - (int)R[I];
25
26 return 0;
27}
28
29[[gnu::weak]] void memset(void *dst, int C, size_t count) {
30 auto *dstc = reinterpret_cast<char *>(dst);
31 for (size_t I = 0; I < count; ++I)
32 dstc[I] = C;
33}
34
35[[gnu::weak]] int printf(const char *Format, ...) {
36 __builtin_va_list vlist;
37 __builtin_va_start(vlist, Format);
38 return ::vprintf(format: Format, vlist);
39}
40}
41
42namespace ompx {
43[[clang::no_builtin("printf")]] int printf(const char *Format, ...) {
44 __builtin_va_list vlist;
45 __builtin_va_start(vlist, Format);
46 return ::vprintf(format: Format, vlist);
47}
48} // namespace ompx
49

source code of offload/DeviceRTL/src/LibC.cpp