1 //===-- paritydi2.c - Implement __paritydi2 -------------------------------===// 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 __paritydi2 for the compiler_rt library. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #include "int_lib.h" 14 15 // Returns: 1 if number of bits is odd else returns 0 16 17 COMPILER_RT_ABI int __paritydi2(di_int a) { 18 dwords x; 19 x.all = a; 20 su_int x2 = x.s.high ^ x.s.low; 21 x2 ^= x2 >> 16; 22 x2 ^= x2 >> 8; 23 x2 ^= x2 >> 4; 24 return (0x6996 >> (x2 & 0xF)) & 1; 25 } 26