13cab2bb3Spatrick //===-- lshrdi3.c - Implement __lshrdi3 -----------------------------------===// 23cab2bb3Spatrick // 33cab2bb3Spatrick // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 43cab2bb3Spatrick // See https://llvm.org/LICENSE.txt for license information. 53cab2bb3Spatrick // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 63cab2bb3Spatrick // 73cab2bb3Spatrick //===----------------------------------------------------------------------===// 83cab2bb3Spatrick // 93cab2bb3Spatrick // This file implements __lshrdi3 for the compiler_rt library. 103cab2bb3Spatrick // 113cab2bb3Spatrick //===----------------------------------------------------------------------===// 123cab2bb3Spatrick 133cab2bb3Spatrick #include "int_lib.h" 143cab2bb3Spatrick 153cab2bb3Spatrick // Returns: logical a >> b 163cab2bb3Spatrick 173cab2bb3Spatrick // Precondition: 0 <= b < bits_in_dword 183cab2bb3Spatrick __lshrdi3(di_int a,int b)19*1f9cb04fSpatrickCOMPILER_RT_ABI di_int __lshrdi3(di_int a, int b) { 203cab2bb3Spatrick const int bits_in_word = (int)(sizeof(si_int) * CHAR_BIT); 213cab2bb3Spatrick udwords input; 223cab2bb3Spatrick udwords result; 233cab2bb3Spatrick input.all = a; 243cab2bb3Spatrick if (b & bits_in_word) /* bits_in_word <= b < bits_in_dword */ { 253cab2bb3Spatrick result.s.high = 0; 263cab2bb3Spatrick result.s.low = input.s.high >> (b - bits_in_word); 273cab2bb3Spatrick } else /* 0 <= b < bits_in_word */ { 283cab2bb3Spatrick if (b == 0) 293cab2bb3Spatrick return a; 303cab2bb3Spatrick result.s.high = input.s.high >> b; 313cab2bb3Spatrick result.s.low = (input.s.high << (bits_in_word - b)) | (input.s.low >> b); 323cab2bb3Spatrick } 333cab2bb3Spatrick return result.all; 343cab2bb3Spatrick } 353cab2bb3Spatrick 363cab2bb3Spatrick #if defined(__ARM_EABI__) 373cab2bb3Spatrick COMPILER_RT_ALIAS(__lshrdi3, __aeabi_llsr) 383cab2bb3Spatrick #endif 39