1 //===-- parityti2.c - Implement __parityti2 -------------------------------===// 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 __parityti2 for the compiler_rt library. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #include "int_lib.h" 14 15 #ifdef CRT_HAS_128BIT 16 17 // Returns: 1 if number of bits is odd else returns 0 18 19 COMPILER_RT_ABI int __parityti2(ti_int a) { 20 twords x; 21 dwords x2; 22 x.all = a; 23 x2.all = x.s.high ^ x.s.low; 24 su_int x3 = x2.s.high ^ x2.s.low; 25 x3 ^= x3 >> 16; 26 x3 ^= x3 >> 8; 27 x3 ^= x3 >> 4; 28 return (0x6996 >> (x3 & 0xF)) & 1; 29 } 30 31 #endif // CRT_HAS_128BIT 32