177ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao/* ====-- ashldi3.c - Implement __ashldi3 -----------------------------------=== 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 __ashldi3 for the compiler_rt library. 1177ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * 1277ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * ===----------------------------------------------------------------------=== 1377ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao */ 1477ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao 1577ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao#include "int_lib.h" 1677ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao 1777ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao/* Returns: a << b */ 1877ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao 1977ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao/* Precondition: 0 <= b < bits_in_dword */ 2077ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao 2177ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liaodi_int 2277ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao__ashldi3(di_int a, si_int b) 2377ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao{ 2477ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao const int bits_in_word = (int)(sizeof(si_int) * CHAR_BIT); 2577ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao dwords input; 2677ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao dwords result; 2777ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao input.all = a; 2877ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao if (b & bits_in_word) /* bits_in_word <= b < bits_in_dword */ 2977ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao { 3077ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao result.s.low = 0; 3177ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao result.s.high = input.s.low << (b - bits_in_word); 3277ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao } 3377ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao else /* 0 <= b < bits_in_word */ 3477ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao { 3577ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao if (b == 0) 3677ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao return a; 3777ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao result.s.low = input.s.low << b; 3877ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao result.s.high = (input.s.high << b) | (input.s.low >> (bits_in_word - b)); 3977ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao } 4077ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao return result.all; 4177ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao} 42