1*3cab2bb3Spatrick //===-- lshrti3.c - Implement __lshrti3 -----------------------------------===// 2*3cab2bb3Spatrick // 3*3cab2bb3Spatrick // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4*3cab2bb3Spatrick // See https://llvm.org/LICENSE.txt for license information. 5*3cab2bb3Spatrick // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6*3cab2bb3Spatrick // 7*3cab2bb3Spatrick //===----------------------------------------------------------------------===// 8*3cab2bb3Spatrick // 9*3cab2bb3Spatrick // This file implements __lshrti3 for the compiler_rt library. 10*3cab2bb3Spatrick // 11*3cab2bb3Spatrick //===----------------------------------------------------------------------===// 12*3cab2bb3Spatrick 13*3cab2bb3Spatrick #include "int_lib.h" 14*3cab2bb3Spatrick 15*3cab2bb3Spatrick #ifdef CRT_HAS_128BIT 16*3cab2bb3Spatrick 17*3cab2bb3Spatrick // Returns: logical a >> b 18*3cab2bb3Spatrick 19*3cab2bb3Spatrick // Precondition: 0 <= b < bits_in_tword 20*3cab2bb3Spatrick __lshrti3(ti_int a,si_int b)21*3cab2bb3SpatrickCOMPILER_RT_ABI ti_int __lshrti3(ti_int a, si_int b) { 22*3cab2bb3Spatrick const int bits_in_dword = (int)(sizeof(di_int) * CHAR_BIT); 23*3cab2bb3Spatrick utwords input; 24*3cab2bb3Spatrick utwords result; 25*3cab2bb3Spatrick input.all = a; 26*3cab2bb3Spatrick if (b & bits_in_dword) /* bits_in_dword <= b < bits_in_tword */ { 27*3cab2bb3Spatrick result.s.high = 0; 28*3cab2bb3Spatrick result.s.low = input.s.high >> (b - bits_in_dword); 29*3cab2bb3Spatrick } else /* 0 <= b < bits_in_dword */ { 30*3cab2bb3Spatrick if (b == 0) 31*3cab2bb3Spatrick return a; 32*3cab2bb3Spatrick result.s.high = input.s.high >> b; 33*3cab2bb3Spatrick result.s.low = (input.s.high << (bits_in_dword - b)) | (input.s.low >> b); 34*3cab2bb3Spatrick } 35*3cab2bb3Spatrick return result.all; 36*3cab2bb3Spatrick } 37*3cab2bb3Spatrick 38*3cab2bb3Spatrick #endif // CRT_HAS_128BIT 39