1*8a6a9560SDaniel Boulby //===-- lshrdi3.c - Implement __lshrdi3 -----------------------------------===// 2*8a6a9560SDaniel Boulby // 3*8a6a9560SDaniel Boulby // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4*8a6a9560SDaniel Boulby // See https://llvm.org/LICENSE.txt for license information. 5*8a6a9560SDaniel Boulby // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6*8a6a9560SDaniel Boulby // 7*8a6a9560SDaniel Boulby //===----------------------------------------------------------------------===// 8*8a6a9560SDaniel Boulby // 9*8a6a9560SDaniel Boulby // This file implements __lshrdi3 for the compiler_rt library. 10*8a6a9560SDaniel Boulby // 11*8a6a9560SDaniel Boulby //===----------------------------------------------------------------------===// 12638d2b51SSandrine Bailleux 13638d2b51SSandrine Bailleux #include "int_lib.h" 14638d2b51SSandrine Bailleux 15*8a6a9560SDaniel Boulby // Returns: logical a >> b 16638d2b51SSandrine Bailleux 17*8a6a9560SDaniel Boulby // Precondition: 0 <= b < bits_in_dword 18638d2b51SSandrine Bailleux __lshrdi3(di_int a,int b)19*8a6a9560SDaniel BoulbyCOMPILER_RT_ABI di_int __lshrdi3(di_int a, int b) { 20638d2b51SSandrine Bailleux const int bits_in_word = (int)(sizeof(si_int) * CHAR_BIT); 21638d2b51SSandrine Bailleux udwords input; 22638d2b51SSandrine Bailleux udwords result; 23638d2b51SSandrine Bailleux input.all = a; 24*8a6a9560SDaniel Boulby if (b & bits_in_word) /* bits_in_word <= b < bits_in_dword */ { 25638d2b51SSandrine Bailleux result.s.high = 0; 26638d2b51SSandrine Bailleux result.s.low = input.s.high >> (b - bits_in_word); 27*8a6a9560SDaniel Boulby } else /* 0 <= b < bits_in_word */ { 28638d2b51SSandrine Bailleux if (b == 0) 29638d2b51SSandrine Bailleux return a; 30638d2b51SSandrine Bailleux result.s.high = input.s.high >> b; 31638d2b51SSandrine Bailleux result.s.low = (input.s.high << (bits_in_word - b)) | (input.s.low >> b); 32638d2b51SSandrine Bailleux } 33638d2b51SSandrine Bailleux return result.all; 34638d2b51SSandrine Bailleux } 35638d2b51SSandrine Bailleux 36638d2b51SSandrine Bailleux #if defined(__ARM_EABI__) 37*8a6a9560SDaniel Boulby COMPILER_RT_ALIAS(__lshrdi3, __aeabi_llsr) 38638d2b51SSandrine Bailleux #endif 39