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