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28 lines
755 B
C
28 lines
755 B
C
/* ===-- paritysi2.c - Implement __paritysi2 -------------------------------===
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*
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* The LLVM Compiler Infrastructure
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*
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* This file is dual licensed under the MIT and the University of Illinois Open
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* Source Licenses. See LICENSE.TXT for details.
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*
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* ===----------------------------------------------------------------------===
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*
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* This file implements __paritysi2 for the compiler_rt library.
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*
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* ===----------------------------------------------------------------------===
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*/
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#include "int_lib.h"
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/* Returns: 1 if number of bits is odd else returns 0 */
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COMPILER_RT_ABI si_int
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__paritysi2(si_int a)
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{
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su_int x = (su_int)a;
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x ^= x >> 16;
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x ^= x >> 8;
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x ^= x >> 4;
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return (0x6996 >> (x & 0xF)) & 1;
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}
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