1 //===-- paritysi2.c - Implement __paritysi2 -------------------------------===// 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 __paritysi2 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 __paritysi2(si_int a) { 18 su_int x = (su_int)a; 19 x ^= x >> 16; 20 x ^= x >> 8; 21 x ^= x >> 4; 22 return (0x6996 >> (x & 0xF)) & 1; 23 } 24