1*7c3d14c8STreehugger Robot /* ===-- clzti2.c - Implement __clzti2 -------------------------------------=== 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 __clzti2 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 #ifdef CRT_HAS_128BIT 18*7c3d14c8STreehugger Robot 19*7c3d14c8STreehugger Robot /* Returns: the number of leading 0-bits */ 20*7c3d14c8STreehugger Robot 21*7c3d14c8STreehugger Robot /* Precondition: a != 0 */ 22*7c3d14c8STreehugger Robot 23*7c3d14c8STreehugger Robot COMPILER_RT_ABI si_int __clzti2(ti_int a)24*7c3d14c8STreehugger Robot__clzti2(ti_int a) 25*7c3d14c8STreehugger Robot { 26*7c3d14c8STreehugger Robot twords x; 27*7c3d14c8STreehugger Robot x.all = a; 28*7c3d14c8STreehugger Robot const di_int f = -(x.s.high == 0); 29*7c3d14c8STreehugger Robot return __builtin_clzll((x.s.high & ~f) | (x.s.low & f)) + 30*7c3d14c8STreehugger Robot ((si_int)f & ((si_int)(sizeof(di_int) * CHAR_BIT))); 31*7c3d14c8STreehugger Robot } 32*7c3d14c8STreehugger Robot 33*7c3d14c8STreehugger Robot #endif /* CRT_HAS_128BIT */ 34