1 /* ====-- ashldi3.c - Implement __ashldi3 -----------------------------------===
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 __ashldi3 for the compiler_rt library.
12 * ===----------------------------------------------------------------------===
19 /* Precondition: 0 <= b < bits_in_dword */
21 ARM_EABI_FNALIAS(llsl, ashldi3);
23 COMPILER_RT_ABI di_int
24 __ashldi3(di_int a, si_int b)
26 const int bits_in_word = (int)(sizeof(si_int) * CHAR_BIT);
30 if (b & bits_in_word) /* bits_in_word <= b < bits_in_dword */
33 result.s.high = input.s.low << (b - bits_in_word);
35 else /* 0 <= b < bits_in_word */
39 result.s.low = input.s.low << b;
40 result.s.high = (input.s.high << b) | (input.s.low >> (bits_in_word - b));