addvsi3.c revision 37a6a455466e5b197311771a777ab241e471ed8a
137a6a455466e5b197311771a777ab241e471ed8aEdward O'Callaghan/* ===-- addvsi3.c - Implement __addvsi3 -----------------------------------=== 237a6a455466e5b197311771a777ab241e471ed8aEdward O'Callaghan * 337a6a455466e5b197311771a777ab241e471ed8aEdward O'Callaghan * The LLVM Compiler Infrastructure 437a6a455466e5b197311771a777ab241e471ed8aEdward O'Callaghan * 537a6a455466e5b197311771a777ab241e471ed8aEdward O'Callaghan * This file is distributed under the University of Illinois Open Source 637a6a455466e5b197311771a777ab241e471ed8aEdward O'Callaghan * License. See LICENSE.TXT for details. 737a6a455466e5b197311771a777ab241e471ed8aEdward O'Callaghan * 837a6a455466e5b197311771a777ab241e471ed8aEdward O'Callaghan * ===----------------------------------------------------------------------=== 937a6a455466e5b197311771a777ab241e471ed8aEdward O'Callaghan * 1037a6a455466e5b197311771a777ab241e471ed8aEdward O'Callaghan * This file implements __addvsi3 for the compiler_rt library. 1137a6a455466e5b197311771a777ab241e471ed8aEdward O'Callaghan * 1237a6a455466e5b197311771a777ab241e471ed8aEdward O'Callaghan * ===----------------------------------------------------------------------=== 1337a6a455466e5b197311771a777ab241e471ed8aEdward O'Callaghan */ 14b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar 15b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar#include "int_lib.h" 16b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar#include <stdlib.h> 17b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar 1837a6a455466e5b197311771a777ab241e471ed8aEdward O'Callaghan/* Returns: a + b */ 19b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar 2037a6a455466e5b197311771a777ab241e471ed8aEdward O'Callaghan/* Effects: aborts if a + b overflows */ 21b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar 22b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbarsi_int 23b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar__addvsi3(si_int a, si_int b) 24b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar{ 25b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar si_int s = a + b; 26b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar if (b >= 0) 27b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar { 28b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar if (s < a) 29b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar abort(); 30b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar } 31b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar else 32b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar { 33b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar if (s >= a) 34b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar abort(); 35b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar } 36b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar return s; 37b3a6901e66f55b35aa9e01bcb24134e6a65ea004Daniel Dunbar} 38