libc/include/llvm-libc-macros/stdckdint-macros.h

   1 //===-- Definition of macros for stdckdint.h ------------------------------===//
   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 #ifndef LLVM_LIBC_MACROS_STDCKDINT_MACROS_H
  10 #define LLVM_LIBC_MACROS_STDCKDINT_MACROS_H
  11
  12 // We need to use __builtin_*_overflow from GCC/Clang to implement the overflow
  13 // macros. Check __GNUC__ or __clang__ for availability of such builtins.
  14 // Note that clang-cl defines __clang__ only and does not define __GNUC__ so we
  15 // have to check for both.
  16 #if defined(__GNUC__) || defined(__clang__)
  17 // clang/gcc overlay may provides similar macros, we need to avoid redefining
  18 // them.
  19 #ifndef __STDC_VERSION_STDCKDINT_H__
  20 #define __STDC_VERSION_STDCKDINT_H__ 202311L
  21
  22 #define ckd_add(R, A, B) __builtin_add_overflow((A), (B), (R))
  23 #define ckd_sub(R, A, B) __builtin_sub_overflow((A), (B), (R))
  24 #define ckd_mul(R, A, B) __builtin_mul_overflow((A), (B), (R))
  25 #endif // __STDC_VERSION_STDCKDINT_H__
  26 #endif // __GNUC__
  27 #endif // LLVM_LIBC_MACROS_STDCKDINT_MACROS_H