13cab2bb3Spatrick //===-- clzti2.c - Implement __clzti2 -------------------------------------===// 23cab2bb3Spatrick // 33cab2bb3Spatrick // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 43cab2bb3Spatrick // See https://llvm.org/LICENSE.txt for license information. 53cab2bb3Spatrick // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 63cab2bb3Spatrick // 73cab2bb3Spatrick //===----------------------------------------------------------------------===// 83cab2bb3Spatrick // 93cab2bb3Spatrick // This file implements __clzti2 for the compiler_rt library. 103cab2bb3Spatrick // 113cab2bb3Spatrick //===----------------------------------------------------------------------===// 123cab2bb3Spatrick 133cab2bb3Spatrick #include "int_lib.h" 143cab2bb3Spatrick 153cab2bb3Spatrick #ifdef CRT_HAS_128BIT 163cab2bb3Spatrick 173cab2bb3Spatrick // Returns: the number of leading 0-bits 183cab2bb3Spatrick 193cab2bb3Spatrick // Precondition: a != 0 203cab2bb3Spatrick __clzti2(ti_int a)21*1f9cb04fSpatrickCOMPILER_RT_ABI int __clzti2(ti_int a) { 223cab2bb3Spatrick twords x; 233cab2bb3Spatrick x.all = a; 243cab2bb3Spatrick const di_int f = -(x.s.high == 0); 253cab2bb3Spatrick return __builtin_clzll((x.s.high & ~f) | (x.s.low & f)) + 263cab2bb3Spatrick ((si_int)f & ((si_int)(sizeof(di_int) * CHAR_BIT))); 273cab2bb3Spatrick } 283cab2bb3Spatrick 293cab2bb3Spatrick #endif // CRT_HAS_128BIT 30