1*0b57cec5SDimitry Andric //===-- paritysi2.c - Implement __paritysi2 -------------------------------===// 2*0b57cec5SDimitry Andric // 3*0b57cec5SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4*0b57cec5SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 5*0b57cec5SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6*0b57cec5SDimitry Andric // 7*0b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 8*0b57cec5SDimitry Andric // 9*0b57cec5SDimitry Andric // This file implements __paritysi2 for the compiler_rt library. 10*0b57cec5SDimitry Andric // 11*0b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 12*0b57cec5SDimitry Andric 13*0b57cec5SDimitry Andric #include "int_lib.h" 14*0b57cec5SDimitry Andric 15*0b57cec5SDimitry Andric // Returns: 1 if number of bits is odd else returns 0 16*0b57cec5SDimitry Andric 17*0b57cec5SDimitry Andric COMPILER_RT_ABI si_int __paritysi2(si_int a) { 18*0b57cec5SDimitry Andric su_int x = (su_int)a; 19*0b57cec5SDimitry Andric x ^= x >> 16; 20*0b57cec5SDimitry Andric x ^= x >> 8; 21*0b57cec5SDimitry Andric x ^= x >> 4; 22*0b57cec5SDimitry Andric return (0x6996 >> (x & 0xF)) & 1; 23*0b57cec5SDimitry Andric } 24