1*0a6a1f1dSLionel Sambuc /* ===-- clzti2.c - Implement __clzti2 -------------------------------------=== 2*0a6a1f1dSLionel Sambuc * 3*0a6a1f1dSLionel Sambuc * The LLVM Compiler Infrastructure 4*0a6a1f1dSLionel Sambuc * 5*0a6a1f1dSLionel Sambuc * This file is dual licensed under the MIT and the University of Illinois Open 6*0a6a1f1dSLionel Sambuc * Source Licenses. See LICENSE.TXT for details. 7*0a6a1f1dSLionel Sambuc * 8*0a6a1f1dSLionel Sambuc * ===----------------------------------------------------------------------=== 9*0a6a1f1dSLionel Sambuc * 10*0a6a1f1dSLionel Sambuc * This file implements __clzti2 for the compiler_rt library. 11*0a6a1f1dSLionel Sambuc * 12*0a6a1f1dSLionel Sambuc * ===----------------------------------------------------------------------=== 13*0a6a1f1dSLionel Sambuc */ 14*0a6a1f1dSLionel Sambuc 15*0a6a1f1dSLionel Sambuc #include "int_lib.h" 16*0a6a1f1dSLionel Sambuc 17*0a6a1f1dSLionel Sambuc #ifdef CRT_HAS_128BIT 18*0a6a1f1dSLionel Sambuc 19*0a6a1f1dSLionel Sambuc /* Returns: the number of leading 0-bits */ 20*0a6a1f1dSLionel Sambuc 21*0a6a1f1dSLionel Sambuc /* Precondition: a != 0 */ 22*0a6a1f1dSLionel Sambuc 23*0a6a1f1dSLionel Sambuc COMPILER_RT_ABI si_int __clzti2(ti_int a)24*0a6a1f1dSLionel Sambuc__clzti2(ti_int a) 25*0a6a1f1dSLionel Sambuc { 26*0a6a1f1dSLionel Sambuc twords x; 27*0a6a1f1dSLionel Sambuc x.all = a; 28*0a6a1f1dSLionel Sambuc const di_int f = -(x.s.high == 0); 29*0a6a1f1dSLionel Sambuc return __builtin_clzll((x.s.high & ~f) | (x.s.low & f)) + 30*0a6a1f1dSLionel Sambuc ((si_int)f & ((si_int)(sizeof(di_int) * CHAR_BIT))); 31*0a6a1f1dSLionel Sambuc } 32*0a6a1f1dSLionel Sambuc 33*0a6a1f1dSLionel Sambuc #endif /* CRT_HAS_128BIT */ 34