1 /* ===-- lshrdi3.c - Implement __lshrdi3 -----------------------------------===
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 __lshrdi3 for the compiler_rt library.
12 * ===----------------------------------------------------------------------===
18 /* Returns: logical a >> b */
20 /* Precondition: 0 <= b < bits_in_dword */
22 ARM_EABI_FNALIAS(llsr, lshrdi3);
24 COMPILER_RT_ABI di_int
25 __lshrdi3(di_int a, si_int b)
27 const int bits_in_word = (int)(sizeof(si_int) * CHAR_BIT);
31 if (b & bits_in_word) /* bits_in_word <= b < bits_in_dword */
34 result.s.low = input.s.high >> (b - bits_in_word);
36 else /* 0 <= b < bits_in_word */
40 result.s.high = input.s.high >> b;
41 result.s.low = (input.s.high << (bits_in_word - b)) | (input.s.low >> b);