1214152Sed/* ===-- ashrti3.c - Implement __ashrti3 -----------------------------------=== 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 __ashrti3 for the compiler_rt library. 11214152Sed * 12214152Sed * ===----------------------------------------------------------------------=== 13214152Sed */ 14214152Sed 15239138Sandrew#include "int_lib.h" 16239138Sandrew 17263763Sdim#ifdef CRT_HAS_128BIT 18214152Sed 19214152Sed/* Returns: arithmetic a >> b */ 20214152Sed 21214152Sed/* Precondition: 0 <= b < bits_in_tword */ 22214152Sed 23214152Sedti_int 24214152Sed__ashrti3(ti_int a, si_int b) 25214152Sed{ 26214152Sed const int bits_in_dword = (int)(sizeof(di_int) * CHAR_BIT); 27214152Sed twords input; 28214152Sed twords result; 29214152Sed input.all = a; 30214152Sed if (b & bits_in_dword) /* bits_in_dword <= b < bits_in_tword */ 31214152Sed { 32214152Sed /* result.s.high = input.s.high < 0 ? -1 : 0 */ 33214152Sed result.s.high = input.s.high >> (bits_in_dword - 1); 34214152Sed result.s.low = input.s.high >> (b - bits_in_dword); 35214152Sed } 36214152Sed else /* 0 <= b < bits_in_dword */ 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_dword - b)) | (input.s.low >> b); 42214152Sed } 43214152Sed return result.all; 44214152Sed} 45214152Sed 46263763Sdim#endif /* CRT_HAS_128BIT */ 47