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