| 1 | //===-- paritydi2.c - Implement __paritydi2 -------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This file implements __paritydi2 for the compiler_rt library. |
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| 10 | // |
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| 11 | //===----------------------------------------------------------------------===// |
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| 12 | |
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| 13 | #include "int_lib.h" |
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| 14 | |
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| 15 | // Returns: 1 if number of bits is odd else returns 0 |
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| 16 | |
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| 17 | COMPILER_RT_ABI int __paritydi2(di_int a) { |
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| 18 | dwords x; |
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| 19 | x.all = a; |
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| 20 | su_int x2 = x.s.high ^ x.s.low; |
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| 21 | x2 ^= x2 >> 16; |
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| 22 | x2 ^= x2 >> 8; |
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| 23 | x2 ^= x2 >> 4; |
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| 24 | return (0x6996 >> (x2 & 0xF)) & 1; |
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| 25 | } |
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| 26 | |
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