1e8d8bef9SDimitry Andric //===-- divmodti4.c - Implement __divmodti4 -------------------------------===// 2e8d8bef9SDimitry Andric // 3e8d8bef9SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4e8d8bef9SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 5e8d8bef9SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6e8d8bef9SDimitry Andric // 7e8d8bef9SDimitry Andric //===----------------------------------------------------------------------===// 8e8d8bef9SDimitry Andric // 9e8d8bef9SDimitry Andric // This file implements __divmodti4 for the compiler_rt library. 10e8d8bef9SDimitry Andric // 11e8d8bef9SDimitry Andric //===----------------------------------------------------------------------===// 12e8d8bef9SDimitry Andric 13e8d8bef9SDimitry Andric #include "int_lib.h" 14e8d8bef9SDimitry Andric 15e8d8bef9SDimitry Andric #ifdef CRT_HAS_128BIT 16e8d8bef9SDimitry Andric 17e8d8bef9SDimitry Andric // Returns: a / b, *rem = a % b 18e8d8bef9SDimitry Andric __divmodti4(ti_int a,ti_int b,ti_int * rem)19e8d8bef9SDimitry AndricCOMPILER_RT_ABI ti_int __divmodti4(ti_int a, ti_int b, ti_int *rem) { 20e8d8bef9SDimitry Andric const int bits_in_tword_m1 = (int)(sizeof(ti_int) * CHAR_BIT) - 1; 21e8d8bef9SDimitry Andric ti_int s_a = a >> bits_in_tword_m1; // s_a = a < 0 ? -1 : 0 22e8d8bef9SDimitry Andric ti_int s_b = b >> bits_in_tword_m1; // s_b = b < 0 ? -1 : 0 23*5f757f3fSDimitry Andric a = (tu_int)(a ^ s_a) - s_a; // negate if s_a == -1 24*5f757f3fSDimitry Andric b = (tu_int)(b ^ s_b) - s_b; // negate if s_b == -1 25e8d8bef9SDimitry Andric s_b ^= s_a; // sign of quotient 26e8d8bef9SDimitry Andric tu_int r; 27e8d8bef9SDimitry Andric ti_int q = (__udivmodti4(a, b, &r) ^ s_b) - s_b; // negate if s_b == -1 28e8d8bef9SDimitry Andric *rem = (r ^ s_a) - s_a; // negate if s_a == -1 29e8d8bef9SDimitry Andric return q; 30e8d8bef9SDimitry Andric } 31e8d8bef9SDimitry Andric 32e8d8bef9SDimitry Andric #endif // CRT_HAS_128BIT 33