10b57cec5SDimitry Andric //===-- paritydi2.c - Implement __paritydi2 -------------------------------===// 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 __paritydi2 for the compiler_rt library. 100b57cec5SDimitry Andric // 110b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 120b57cec5SDimitry Andric 130b57cec5SDimitry Andric #include "int_lib.h" 140b57cec5SDimitry Andric 150b57cec5SDimitry Andric // Returns: 1 if number of bits is odd else returns 0 160b57cec5SDimitry Andric __paritydi2(di_int a)175ffd83dbSDimitry AndricCOMPILER_RT_ABI int __paritydi2(di_int a) { 180b57cec5SDimitry Andric dwords x; 190b57cec5SDimitry Andric x.all = a; 20*e8d8bef9SDimitry Andric su_int x2 = x.s.high ^ x.s.low; 21*e8d8bef9SDimitry Andric x2 ^= x2 >> 16; 22*e8d8bef9SDimitry Andric x2 ^= x2 >> 8; 23*e8d8bef9SDimitry Andric x2 ^= x2 >> 4; 24*e8d8bef9SDimitry Andric return (0x6996 >> (x2 & 0xF)) & 1; 250b57cec5SDimitry Andric } 26