1214152Sed/* ===-- lshrti3.c - Implement __lshrti3 -----------------------------------=== 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 __lshrti3 for the compiler_rt library. 11214152Sed * 12214152Sed * ===----------------------------------------------------------------------=== 13214152Sed */ 14214152Sed 15239138Sandrew#include "int_lib.h" 16239138Sandrew 17263763Sdim#ifdef CRT_HAS_128BIT 18214152Sed 19214152Sed/* Returns: logical a >> b */ 20214152Sed 21214152Sed/* Precondition: 0 <= b < bits_in_tword */ 22214152Sed 23214152Sedti_int 24214152Sed__lshrti3(ti_int a, si_int b) 25214152Sed{ 26214152Sed const int bits_in_dword = (int)(sizeof(di_int) * CHAR_BIT); 27214152Sed utwords input; 28214152Sed utwords result; 29214152Sed input.all = a; 30214152Sed if (b & bits_in_dword) /* bits_in_dword <= b < bits_in_tword */ 31214152Sed { 32214152Sed result.s.high = 0; 33214152Sed result.s.low = input.s.high >> (b - bits_in_dword); 34214152Sed } 35214152Sed else /* 0 <= b < bits_in_dword */ 36214152Sed { 37214152Sed if (b == 0) 38214152Sed return a; 39214152Sed result.s.high = input.s.high >> b; 40214152Sed result.s.low = (input.s.high << (bits_in_dword - b)) | (input.s.low >> b); 41214152Sed } 42214152Sed return result.all; 43214152Sed} 44214152Sed 45263763Sdim#endif /* CRT_HAS_128BIT */ 46