1 /* ===-- ashrti3.c - Implement __ashrti3 -----------------------------------===
3 * The LLVM Compiler Infrastructure
5 * This file is dual licensed under the MIT and the University of Illinois Open
6 * Source Licenses. See LICENSE.TXT for details.
8 * ===----------------------------------------------------------------------===
10 * This file implements __ashrti3 for the compiler_rt library.
12 * ===----------------------------------------------------------------------===
19 /* Returns: arithmetic a >> b */
21 /* Precondition: 0 <= b < bits_in_tword */
24 __ashrti3(ti_int a, si_int b)
26 const int bits_in_dword = (int)(sizeof(di_int) * CHAR_BIT);
30 if (b & bits_in_dword) /* bits_in_dword <= b < bits_in_tword */
32 /* result.s.high = input.s.high < 0 ? -1 : 0 */
33 result.s.high = input.s.high >> (bits_in_dword - 1);
34 result.s.low = input.s.high >> (b - bits_in_dword);
36 else /* 0 <= b < bits_in_dword */
40 result.s.high = input.s.high >> b;
41 result.s.low = (input.s.high << (bits_in_dword - b)) | (input.s.low >> b);