| /* ===-- ctzti2.c - Implement __ctzti2 -------------------------------------=== |
| * |
| * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| * See https://llvm.org/LICENSE.txt for license information. |
| * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| * |
| * ===----------------------------------------------------------------------=== |
| * |
| * This file implements __ctzti2 for the compiler_rt library. |
| * |
| * ===----------------------------------------------------------------------=== |
| */ |
| |
| #include "int_lib.h" |
| |
| #ifdef CRT_HAS_128BIT |
| |
| /* Returns: the number of trailing 0-bits */ |
| |
| /* Precondition: a != 0 */ |
| |
| COMPILER_RT_ABI si_int |
| __ctzti2(ti_int a) |
| { |
| twords x; |
| x.all = a; |
| const di_int f = -(x.s.low == 0); |
| return __builtin_ctzll((x.s.high & f) | (x.s.low & ~f)) + |
| ((si_int)f & ((si_int)(sizeof(di_int) * CHAR_BIT))); |
| } |
| |
| #endif /* CRT_HAS_128BIT */ |