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