10b57cec5SDimitry Andric //===-- ashlti3.c - Implement __ashlti3 -----------------------------------===// 20b57cec5SDimitry Andric // 30b57cec5SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 40b57cec5SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 50b57cec5SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 60b57cec5SDimitry Andric // 70b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 80b57cec5SDimitry Andric // 90b57cec5SDimitry Andric // This file implements __ashlti3 for the compiler_rt library. 100b57cec5SDimitry Andric // 110b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 120b57cec5SDimitry Andric 130b57cec5SDimitry Andric #include "int_lib.h" 140b57cec5SDimitry Andric 150b57cec5SDimitry Andric #ifdef CRT_HAS_128BIT 160b57cec5SDimitry Andric 170b57cec5SDimitry Andric // Returns: a << b 180b57cec5SDimitry Andric 190b57cec5SDimitry Andric // Precondition: 0 <= b < bits_in_tword 200b57cec5SDimitry Andric __ashlti3(ti_int a,int b)2106c3fb27SDimitry AndricCOMPILER_RT_ABI ti_int __ashlti3(ti_int a, int b) { 220b57cec5SDimitry Andric const int bits_in_dword = (int)(sizeof(di_int) * CHAR_BIT); 230b57cec5SDimitry Andric twords input; 240b57cec5SDimitry Andric twords result; 250b57cec5SDimitry Andric input.all = a; 260b57cec5SDimitry Andric if (b & bits_in_dword) /* bits_in_dword <= b < bits_in_tword */ { 270b57cec5SDimitry Andric result.s.low = 0; 280b57cec5SDimitry Andric result.s.high = input.s.low << (b - bits_in_dword); 290b57cec5SDimitry Andric } else /* 0 <= b < bits_in_dword */ { 300b57cec5SDimitry Andric if (b == 0) 310b57cec5SDimitry Andric return a; 320b57cec5SDimitry Andric result.s.low = input.s.low << b; 335f757f3fSDimitry Andric result.s.high = 345f757f3fSDimitry Andric ((du_int)input.s.high << b) | (input.s.low >> (bits_in_dword - b)); 350b57cec5SDimitry Andric } 360b57cec5SDimitry Andric return result.all; 370b57cec5SDimitry Andric } 380b57cec5SDimitry Andric 390b57cec5SDimitry Andric #endif // CRT_HAS_128BIT 40