1 /* ===-- paritysi2.c - Implement __paritysi2 -------------------------------=== 2 * 3 * The LLVM Compiler Infrastructure 4 * 5 * This file is dual licensed under the MIT and the University of Illinois Open 6 * Source Licenses. See LICENSE.TXT for details. 7 * 8 * ===----------------------------------------------------------------------=== 9 * 10 * This file implements __paritysi2 for the compiler_rt library. 11 * 12 * ===----------------------------------------------------------------------=== 13 */ 14 15 #include "int_lib.h" 16 17 /* Returns: 1 if number of bits is odd else returns 0 */ 18 19 COMPILER_RT_ABI si_int 20 __paritysi2(si_int a) 21 { 22 su_int x = (su_int)a; 23 x ^= x >> 16; 24 x ^= x >> 8; 25 x ^= x >> 4; 26 return (0x6996 >> (x & 0xF)) & 1; 27 } 28
