1214152Sed/*===-- ashrdi3.c - Implement __ashrdi3 -----------------------------------=== 2214152Sed * 3214152Sed * The LLVM Compiler Infrastructure 4214152Sed * 5222656Sed * This file is dual licensed under the MIT and the University of Illinois Open 6222656Sed * Source Licenses. See LICENSE.TXT for details. 7214152Sed * 8214152Sed * ===----------------------------------------------------------------------=== 9214152Sed * 10214152Sed * This file implements __ashrdi3 for the compiler_rt library. 11214152Sed * 12214152Sed * ===----------------------------------------------------------------------=== 13214152Sed */ 14214152Sed 15214152Sed#include "int_lib.h" 16214152Sed 17214152Sed/* Returns: arithmetic a >> b */ 18214152Sed 19214152Sed/* Precondition: 0 <= b < bits_in_dword */ 20214152Sed 21239138SandrewARM_EABI_FNALIAS(lasr, ashrdi3) 22222656Sed 23222656SedCOMPILER_RT_ABI di_int 24214152Sed__ashrdi3(di_int a, si_int b) 25214152Sed{ 26214152Sed const int bits_in_word = (int)(sizeof(si_int) * CHAR_BIT); 27214152Sed dwords input; 28214152Sed dwords result; 29214152Sed input.all = a; 30214152Sed if (b & bits_in_word) /* bits_in_word <= b < bits_in_dword */ 31214152Sed { 32214152Sed /* result.s.high = input.s.high < 0 ? -1 : 0 */ 33214152Sed result.s.high = input.s.high >> (bits_in_word - 1); 34214152Sed result.s.low = input.s.high >> (b - bits_in_word); 35214152Sed } 36214152Sed else /* 0 <= b < bits_in_word */ 37214152Sed { 38214152Sed if (b == 0) 39214152Sed return a; 40214152Sed result.s.high = input.s.high >> b; 41214152Sed result.s.low = (input.s.high << (bits_in_word - b)) | (input.s.low >> b); 42214152Sed } 43214152Sed return result.all; 44214152Sed} 45