1*d89ec533Spatrick //===-- divmodti4.c - Implement __divmodti4 -------------------------------===// 2*d89ec533Spatrick // 3*d89ec533Spatrick // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4*d89ec533Spatrick // See https://llvm.org/LICENSE.txt for license information. 5*d89ec533Spatrick // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6*d89ec533Spatrick // 7*d89ec533Spatrick //===----------------------------------------------------------------------===// 8*d89ec533Spatrick // 9*d89ec533Spatrick // This file implements __divmodti4 for the compiler_rt library. 10*d89ec533Spatrick // 11*d89ec533Spatrick //===----------------------------------------------------------------------===// 12*d89ec533Spatrick 13*d89ec533Spatrick #include "int_lib.h" 14*d89ec533Spatrick 15*d89ec533Spatrick #ifdef CRT_HAS_128BIT 16*d89ec533Spatrick 17*d89ec533Spatrick // Returns: a / b, *rem = a % b 18*d89ec533Spatrick __divmodti4(ti_int a,ti_int b,ti_int * rem)19*d89ec533SpatrickCOMPILER_RT_ABI ti_int __divmodti4(ti_int a, ti_int b, ti_int *rem) { 20*d89ec533Spatrick const int bits_in_tword_m1 = (int)(sizeof(ti_int) * CHAR_BIT) - 1; 21*d89ec533Spatrick ti_int s_a = a >> bits_in_tword_m1; // s_a = a < 0 ? -1 : 0 22*d89ec533Spatrick ti_int s_b = b >> bits_in_tword_m1; // s_b = b < 0 ? -1 : 0 23*d89ec533Spatrick a = (a ^ s_a) - s_a; // negate if s_a == -1 24*d89ec533Spatrick b = (b ^ s_b) - s_b; // negate if s_b == -1 25*d89ec533Spatrick s_b ^= s_a; // sign of quotient 26*d89ec533Spatrick tu_int r; 27*d89ec533Spatrick ti_int q = (__udivmodti4(a, b, &r) ^ s_b) - s_b; // negate if s_b == -1 28*d89ec533Spatrick *rem = (r ^ s_a) - s_a; // negate if s_a == -1 29*d89ec533Spatrick return q; 30*d89ec533Spatrick } 31*d89ec533Spatrick 32*d89ec533Spatrick #endif // CRT_HAS_128BIT 33