1 /* ffs -- find first set bit in a word, counted from least significant end.
3 Copyright (C) 2000-2021 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <https://www.gnu.org/licenses/>. */
21 #define ffsl __something_else
26 /* ffs: find first bit set. This is defined the same way as
27 the libc and compiler builtin ffs routines, therefore
28 differs in spirit from the above ffz (man ffs). */
37 __asm__(" lr %%r1,%1\n"
43 "0: tml %%r1,0x00FF\n"
47 "1: tml %%r1,0x000F\n"
51 "2: tml %%r1,0x0003\n"
55 "3: tml %%r1,0x0001\n"
59 : "=&d" (r
) : "d" (x
) : "cc", "1" );
63 weak_alias (__ffs
, ffs
)
64 libc_hidden_def (__ffs
)
65 libc_hidden_builtin_def (ffs
)
66 #if ULONG_MAX == UINT_MAX
68 weak_alias (__ffs
, ffsl
)