177ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao/* ===-- ashrti3.c - Implement __ashrti3 -----------------------------------=== 277ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * 377ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * The LLVM Compiler Infrastructure 477ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * 577ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * This file is distributed under the University of Illinois Open Source 677ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * License. See LICENSE.TXT for details. 777ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * 877ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * ===----------------------------------------------------------------------=== 977ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * 1077ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * This file implements __ashrti3 for the compiler_rt library. 1177ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * 1277ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * ===----------------------------------------------------------------------=== 1377ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao */ 1477ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao 1577ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao#if __x86_64 1677ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao 1777ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao#include "int_lib.h" 1877ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao 1977ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao/* Returns: arithmetic a >> b */ 2077ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao 2177ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao/* Precondition: 0 <= b < bits_in_tword */ 2277ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao 2377ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liaoti_int 2477ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao__ashrti3(ti_int a, si_int b) 2577ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao{ 2677ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao const int bits_in_dword = (int)(sizeof(di_int) * CHAR_BIT); 2777ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao twords input; 2877ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao twords result; 2977ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao input.all = a; 3077ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao if (b & bits_in_dword) /* bits_in_dword <= b < bits_in_tword */ 3177ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao { 3277ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao /* result.s.high = input.s.high < 0 ? -1 : 0 */ 3377ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao result.s.high = input.s.high >> (bits_in_dword - 1); 3477ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao result.s.low = input.s.high >> (b - bits_in_dword); 3577ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao } 3677ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao else /* 0 <= b < bits_in_dword */ 3777ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao { 3877ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao if (b == 0) 3977ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao return a; 4077ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao result.s.high = input.s.high >> b; 4177ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao result.s.low = (input.s.high << (bits_in_dword - b)) | (input.s.low >> b); 4277ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao } 4377ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao return result.all; 4477ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao} 4577ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao 4677ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao#endif /* __x86_64 */ 47