| // ====-- ashldi3.c - Implement __ashldi3 ---------------------------------===// |
| // |
| // 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 __ashldi3 for the compiler_rt library. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "int_lib.h" |
| |
| // Returns: a << b |
| |
| // Precondition: 0 <= b < bits_in_dword |
| |
| COMPILER_RT_ABI di_int __ashldi3(di_int a, int b) { |
| const int bits_in_word = (int)(sizeof(si_int) * CHAR_BIT); |
| dwords input; |
| dwords result; |
| input.all = a; |
| if (b & bits_in_word) /* bits_in_word <= b < bits_in_dword */ { |
| result.s.low = 0; |
| result.s.high = input.s.low << (b - bits_in_word); |
| } else /* 0 <= b < bits_in_word */ { |
| if (b == 0) |
| return a; |
| result.s.low = input.s.low << b; |
| result.s.high = (input.s.high << b) | (input.s.low >> (bits_in_word - b)); |
| } |
| return result.all; |
| } |
| |
| #if defined(__ARM_EABI__) |
| COMPILER_RT_ALIAS(__ashldi3, __aeabi_llsl) |
| #endif |
