| /* ===-- ffsti2.c - Implement __ffsti2 -------------------------------------=== |
| * |
| * The LLVM Compiler Infrastructure |
| * |
| * This file is dual licensed under the MIT and the University of Illinois Open |
| * Source Licenses. See LICENSE.TXT for details. |
| * |
| * ===----------------------------------------------------------------------=== |
| * |
| * This file implements __ffsti2 for the compiler_rt library. |
| * |
| * ===----------------------------------------------------------------------=== |
| */ |
| |
| #include "int_lib.h" |
| |
| #ifdef CRT_HAS_128BIT |
| |
| /* Returns: the index of the least significant 1-bit in a, or |
| * the value zero if a is zero. The least significant bit is index one. |
| */ |
| |
| COMPILER_RT_ABI si_int |
| __ffsti2(ti_int a) |
| { |
| twords x; |
| x.all = a; |
| if (x.s.low == 0) |
| { |
| if (x.s.high == 0) |
| return 0; |
| return __builtin_ctzll(x.s.high) + (1 + sizeof(di_int) * CHAR_BIT); |
| } |
| return __builtin_ctzll(x.s.low) + 1; |
| } |
| |
| #endif /* CRT_HAS_128BIT */ |
