| //===-- parityti2.c - Implement __parityti2 -------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements __parityti2 for the compiler_rt library. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "int_lib.h" |
| |
| #ifdef CRT_HAS_128BIT |
| |
| // Returns: 1 if number of bits is odd else returns 0 |
| |
| COMPILER_RT_ABI int __parityti2(ti_int a) { |
| twords x; |
| dwords x2; |
| x.all = a; |
| x2.all = x.s.high ^ x.s.low; |
| su_int x3 = x2.s.high ^ x2.s.low; |
| x3 ^= x3 >> 16; |
| x3 ^= x3 >> 8; |
| x3 ^= x3 >> 4; |
| return (0x6996 >> (x3 & 0xF)) & 1; |
| } |
| |
| #endif // CRT_HAS_128BIT |
