| //===-- moddi3.c - Implement __moddi3 -------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements __moddi3 for the compiler_rt library. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "int_lib.h" |
| |
| // Returns: a % b |
| |
| COMPILER_RT_ABI di_int __moddi3(di_int a, di_int b) { |
| const int bits_in_dword_m1 = (int)(sizeof(di_int) * CHAR_BIT) - 1; |
| di_int s = b >> bits_in_dword_m1; // s = b < 0 ? -1 : 0 |
| b = (b ^ s) - s; // negate if s == -1 |
| s = a >> bits_in_dword_m1; // s = a < 0 ? -1 : 0 |
| a = (a ^ s) - s; // negate if s == -1 |
| du_int r; |
| __udivmoddi4(a, b, &r); |
| return ((di_int)r ^ s) - s; // negate if s == -1 |
| } |