1 // ====-- ashldi3.c - Implement __ashldi3 ---------------------------------===// 2 // 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 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file implements __ashldi3 for the compiler_rt library. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #include "int_lib.h" 14 15 // Returns: a << b 16 17 // Precondition: 0 <= b < bits_in_dword 18 19 COMPILER_RT_ABI di_int __ashldi3(di_int a, si_int b) { 20 const int bits_in_word = (int)(sizeof(si_int) * CHAR_BIT); 21 dwords input; 22 dwords result; 23 input.all = a; 24 if (b & bits_in_word) /* bits_in_word <= b < bits_in_dword */ { 25 result.s.low = 0; 26 result.s.high = input.s.low << (b - bits_in_word); 27 } else /* 0 <= b < bits_in_word */ { 28 if (b == 0) 29 return a; 30 result.s.low = input.s.low << b; 31 result.s.high = (input.s.high << b) | (input.s.low >> (bits_in_word - b)); 32 } 33 return result.all; 34 } 35 36 #if defined(__ARM_EABI__) 37 COMPILER_RT_ALIAS(__ashldi3, __aeabi_llsl) 38 #endif 39