11556Srgrimes/* ===-- divdi3.c - Implement __divdi3 -------------------------------------=== 21556Srgrimes * 31556Srgrimes * The LLVM Compiler Infrastructure 41556Srgrimes * 51556Srgrimes * This file is dual licensed under the MIT and the University of Illinois Open 61556Srgrimes * Source Licenses. See LICENSE.TXT for details. 71556Srgrimes * 81556Srgrimes * ===----------------------------------------------------------------------=== 91556Srgrimes * 101556Srgrimes * This file implements __divdi3 for the compiler_rt library. 111556Srgrimes * 121556Srgrimes * ===----------------------------------------------------------------------=== 131556Srgrimes */ 141556Srgrimes 151556Srgrimes#include "int_lib.h" 161556Srgrimes 171556Srgrimesdu_int COMPILER_RT_ABI __udivmoddi4(du_int a, du_int b, du_int* rem); 181556Srgrimes 191556Srgrimes/* Returns: a / b */ 201556Srgrimes 211556SrgrimesCOMPILER_RT_ABI di_int 221556Srgrimes__divdi3(di_int a, di_int b) 231556Srgrimes{ 241556Srgrimes const int bits_in_dword_m1 = (int)(sizeof(di_int) * CHAR_BIT) - 1; 251556Srgrimes di_int s_a = a >> bits_in_dword_m1; /* s_a = a < 0 ? -1 : 0 */ 261556Srgrimes di_int s_b = b >> bits_in_dword_m1; /* s_b = b < 0 ? -1 : 0 */ 271556Srgrimes a = (a ^ s_a) - s_a; /* negate if s_a == -1 */ 281556Srgrimes b = (b ^ s_b) - s_b; /* negate if s_b == -1 */ 291556Srgrimes s_a ^= s_b; /*sign of quotient */ 301556Srgrimes return (__udivmoddi4(a, b, (du_int*)0) ^ s_a) - s_a; /* negate if s_a == -1 */ 311556Srgrimes} 321556Srgrimes