1*0b57cec5SDimitry Andric //===-- ashlti3.c - Implement __ashlti3 -----------------------------------===// 2*0b57cec5SDimitry Andric // 3*0b57cec5SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4*0b57cec5SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 5*0b57cec5SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6*0b57cec5SDimitry Andric // 7*0b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 8*0b57cec5SDimitry Andric // 9*0b57cec5SDimitry Andric // This file implements __ashlti3 for the compiler_rt library. 10*0b57cec5SDimitry Andric // 11*0b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 12*0b57cec5SDimitry Andric 13*0b57cec5SDimitry Andric #include "int_lib.h" 14*0b57cec5SDimitry Andric 15*0b57cec5SDimitry Andric #ifdef CRT_HAS_128BIT 16*0b57cec5SDimitry Andric 17*0b57cec5SDimitry Andric // Returns: a << b 18*0b57cec5SDimitry Andric 19*0b57cec5SDimitry Andric // Precondition: 0 <= b < bits_in_tword 20*0b57cec5SDimitry Andric 21*0b57cec5SDimitry Andric COMPILER_RT_ABI ti_int __ashlti3(ti_int a, si_int b) { 22*0b57cec5SDimitry Andric const int bits_in_dword = (int)(sizeof(di_int) * CHAR_BIT); 23*0b57cec5SDimitry Andric twords input; 24*0b57cec5SDimitry Andric twords result; 25*0b57cec5SDimitry Andric input.all = a; 26*0b57cec5SDimitry Andric if (b & bits_in_dword) /* bits_in_dword <= b < bits_in_tword */ { 27*0b57cec5SDimitry Andric result.s.low = 0; 28*0b57cec5SDimitry Andric result.s.high = input.s.low << (b - bits_in_dword); 29*0b57cec5SDimitry Andric } else /* 0 <= b < bits_in_dword */ { 30*0b57cec5SDimitry Andric if (b == 0) 31*0b57cec5SDimitry Andric return a; 32*0b57cec5SDimitry Andric result.s.low = input.s.low << b; 33*0b57cec5SDimitry Andric result.s.high = (input.s.high << b) | (input.s.low >> (bits_in_dword - b)); 34*0b57cec5SDimitry Andric } 35*0b57cec5SDimitry Andric return result.all; 36*0b57cec5SDimitry Andric } 37*0b57cec5SDimitry Andric 38*0b57cec5SDimitry Andric #endif // CRT_HAS_128BIT 39