10b57cec5SDimitry Andric //===-- paritysi2.c - Implement __paritysi2 -------------------------------===// 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 __paritysi2 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 17*5ffd83dbSDimitry Andric COMPILER_RT_ABI int __paritysi2(si_int a) { 180b57cec5SDimitry Andric su_int x = (su_int)a; 190b57cec5SDimitry Andric x ^= x >> 16; 200b57cec5SDimitry Andric x ^= x >> 8; 210b57cec5SDimitry Andric x ^= x >> 4; 220b57cec5SDimitry Andric return (0x6996 >> (x & 0xF)) & 1; 230b57cec5SDimitry Andric } 24