1 //===-- ashrti3.c - Implement __ashrti3 -----------------------------------===//
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 __ashrti3 for the compiler_rt library.
11 //===----------------------------------------------------------------------===//
17 // Returns: arithmetic a >> b
19 // Precondition: 0 <= b < bits_in_tword
21 COMPILER_RT_ABI ti_int __ashrti3(ti_int a, si_int b) {
22 const int bits_in_dword = (int)(sizeof(di_int) * CHAR_BIT);
26 if (b & bits_in_dword) /* bits_in_dword <= b < bits_in_tword */ {
27 // result.s.high = input.s.high < 0 ? -1 : 0
28 result.s.high = input.s.high >> (bits_in_dword - 1);
29 result.s.low = input.s.high >> (b - bits_in_dword);
30 } else /* 0 <= b < bits_in_dword */ {
33 result.s.high = input.s.high >> b;
34 result.s.low = (input.s.high << (bits_in_dword - b)) | (input.s.low >> b);
39 #endif // CRT_HAS_128BIT