addvsi3.c revision b3a6901e66f55b35aa9e01bcb24134e6a65ea004
1b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar//===-- addvsi3.c - Implement __addvsi3 -----------------------------------===// 2b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar// 3b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar// The LLVM Compiler Infrastructure 4b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar// 5b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar// This file is distributed under the University of Illinois Open Source 6b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar// License. See LICENSE.TXT for details. 7b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar// 8b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar//===----------------------------------------------------------------------===// 9b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar// 10b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar// This file implements __addvsi3 for the compiler_rt library. 11b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar// 12b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar//===----------------------------------------------------------------------===// 13b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar 14b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar#include "int_lib.h" 15b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar#include <stdlib.h> 16b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar 17b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar// Returns: a + b 18b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar 19b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar// Effects: aborts if a + b overflows 20b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar 21b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbarsi_int 22b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar__addvsi3(si_int a, si_int b) 23b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar{ 24b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar si_int s = a + b; 25b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar if (b >= 0) 26b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar { 27b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar if (s < a) 28b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar abort(); 29b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar } 30b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar else 31b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar { 32b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar if (s >= a) 33b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar abort(); 34b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar } 35b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar return s; 36b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar} 37