1//===-- ashlti3.c - Implement __ashlti3 -----------------------------------===// 2// 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4// See https://llvm.org/LICENSE.txt for license information. 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6// 7//===----------------------------------------------------------------------===// 8// 9// This file implements __ashlti3 for the compiler_rt library. 10// 11//===----------------------------------------------------------------------===// 12 13#include "int_lib.h" 14 15#ifdef CRT_HAS_128BIT 16 17// Returns: a << b 18 19// Precondition: 0 <= b < bits_in_tword 20 21COMPILER_RT_ABI ti_int __ashlti3(ti_int a, si_int b) { 22 const int bits_in_dword = (int)(sizeof(di_int) * CHAR_BIT); 23 twords input; 24 twords result; 25 input.all = a; 26 if (b & bits_in_dword) /* bits_in_dword <= b < bits_in_tword */ { 27 result.s.low = 0; 28 result.s.high = input.s.low << (b - bits_in_dword); 29 } else /* 0 <= b < bits_in_dword */ { 30 if (b == 0) 31 return a; 32 result.s.low = input.s.low << b; 33 result.s.high = (input.s.high << b) | (input.s.low >> (bits_in_dword - b)); 34 } 35 return result.all; 36} 37 38#endif // CRT_HAS_128BIT 39