1*7c3d14c8STreehugger Robot /* ===-- paritysi2.c - Implement __paritysi2 -------------------------------=== 2*7c3d14c8STreehugger Robot * 3*7c3d14c8STreehugger Robot * The LLVM Compiler Infrastructure 4*7c3d14c8STreehugger Robot * 5*7c3d14c8STreehugger Robot * This file is dual licensed under the MIT and the University of Illinois Open 6*7c3d14c8STreehugger Robot * Source Licenses. See LICENSE.TXT for details. 7*7c3d14c8STreehugger Robot * 8*7c3d14c8STreehugger Robot * ===----------------------------------------------------------------------=== 9*7c3d14c8STreehugger Robot * 10*7c3d14c8STreehugger Robot * This file implements __paritysi2 for the compiler_rt library. 11*7c3d14c8STreehugger Robot * 12*7c3d14c8STreehugger Robot * ===----------------------------------------------------------------------=== 13*7c3d14c8STreehugger Robot */ 14*7c3d14c8STreehugger Robot 15*7c3d14c8STreehugger Robot #include "int_lib.h" 16*7c3d14c8STreehugger Robot 17*7c3d14c8STreehugger Robot /* Returns: 1 if number of bits is odd else returns 0 */ 18*7c3d14c8STreehugger Robot 19*7c3d14c8STreehugger Robot COMPILER_RT_ABI si_int __paritysi2(si_int a)20*7c3d14c8STreehugger Robot__paritysi2(si_int a) 21*7c3d14c8STreehugger Robot { 22*7c3d14c8STreehugger Robot su_int x = (su_int)a; 23*7c3d14c8STreehugger Robot x ^= x >> 16; 24*7c3d14c8STreehugger Robot x ^= x >> 8; 25*7c3d14c8STreehugger Robot x ^= x >> 4; 26*7c3d14c8STreehugger Robot return (0x6996 >> (x & 0xF)) & 1; 27*7c3d14c8STreehugger Robot } 28