1 //===-- modti3.c - Implement __modti3 -------------------------------------===// 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 __modti3 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 19 COMPILER_RT_ABI ti_int __modti3(ti_int a, ti_int b) { 20 const int bits_in_tword_m1 = (int)(sizeof(ti_int) * CHAR_BIT) - 1; 21 ti_int s = b >> bits_in_tword_m1; // s = b < 0 ? -1 : 0 22 b = (b ^ s) - s; // negate if s == -1 23 s = a >> bits_in_tword_m1; // s = a < 0 ? -1 : 0 24 a = (a ^ s) - s; // negate if s == -1 25 tu_int r; 26 __udivmodti4(a, b, &r); 27 return ((ti_int)r ^ s) - s; // negate if s == -1 28 } 29 30 #endif // CRT_HAS_128BIT 31