1//===-- divti3.c - Implement __divti3 -------------------------------------===// 2// 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4// See https://llvm.org/LICENSE.txt for license information. 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6// 7//===----------------------------------------------------------------------===// 8// 9// This file implements __divti3 for the compiler_rt library. 10// 11//===----------------------------------------------------------------------===// 12 13#include "int_lib.h" 14 15#ifdef CRT_HAS_128BIT 16 17// Returns: a / b 18 19COMPILER_RT_ABI ti_int __divti3(ti_int a, ti_int b) { 20 const int bits_in_tword_m1 = (int)(sizeof(ti_int) * CHAR_BIT) - 1; 21 ti_int s_a = a >> bits_in_tword_m1; // s_a = a < 0 ? -1 : 0 22 ti_int s_b = b >> bits_in_tword_m1; // s_b = b < 0 ? -1 : 0 23 a = (a ^ s_a) - s_a; // negate if s_a == -1 24 b = (b ^ s_b) - s_b; // negate if s_b == -1 25 s_a ^= s_b; // sign of quotient 26 return (__udivmodti4(a, b, (tu_int *)0) ^ s_a) - s_a; // negate if s_a == -1 27} 28 29#endif // CRT_HAS_128BIT 30