1 //===-- modti3.c - Implement __modti3 -------------------------------------===//
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
7 //===----------------------------------------------------------------------===//
9 // This file implements __modti3 for the compiler_rt library.
11 //===----------------------------------------------------------------------===//
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
26 __udivmodti4(a, b, &r);
27 return ((ti_int)r ^ s) - s; // negate if s == -1
30 #endif // CRT_HAS_128BIT