10b57cec5SDimitry Andric //===-- divmoddi4.c - Implement __divmoddi4 -------------------------------===// 20b57cec5SDimitry Andric // 30b57cec5SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 40b57cec5SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 50b57cec5SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 60b57cec5SDimitry Andric // 70b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 80b57cec5SDimitry Andric // 90b57cec5SDimitry Andric // This file implements __divmoddi4 for the compiler_rt library. 100b57cec5SDimitry Andric // 110b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 120b57cec5SDimitry Andric 130b57cec5SDimitry Andric #include "int_lib.h" 140b57cec5SDimitry Andric 150b57cec5SDimitry Andric // Returns: a / b, *rem = a % b 160b57cec5SDimitry Andric 170b57cec5SDimitry Andric COMPILER_RT_ABI di_int __divmoddi4(di_int a, di_int b, di_int *rem) { 18e8d8bef9SDimitry Andric const int bits_in_dword_m1 = (int)(sizeof(di_int) * CHAR_BIT) - 1; 19e8d8bef9SDimitry Andric di_int s_a = a >> bits_in_dword_m1; // s_a = a < 0 ? -1 : 0 20e8d8bef9SDimitry Andric di_int s_b = b >> bits_in_dword_m1; // s_b = b < 0 ? -1 : 0 21*5f757f3fSDimitry Andric a = (du_int)(a ^ s_a) - s_a; // negate if s_a == -1 22*5f757f3fSDimitry Andric b = (du_int)(b ^ s_b) - s_b; // negate if s_b == -1 23e8d8bef9SDimitry Andric s_b ^= s_a; // sign of quotient 24e8d8bef9SDimitry Andric du_int r; 25e8d8bef9SDimitry Andric di_int q = (__udivmoddi4(a, b, &r) ^ s_b) - s_b; // negate if s_b == -1 26e8d8bef9SDimitry Andric *rem = (r ^ s_a) - s_a; // negate if s_a == -1 27e8d8bef9SDimitry Andric return q; 280b57cec5SDimitry Andric } 29