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
__paritysi2(si_int a)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