1 /* Copyright (C) 2009 Free Software Foundation, Inc.
3 This file is part of GCC.
5 GCC is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3, or (at your option)
10 GCC is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 Under Section 7 of GPL version 3, you are granted additional
16 permissions described in the GCC Runtime Library Exception, version
17 3.1, as published by the Free Software Foundation.
19 You should have received a copy of the GNU General Public License and
20 a copy of the GCC Runtime Library Exception along with this program;
21 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
22 <http://www.gnu.org/licenses/>. */
24 #ifndef _X86INTRIN_H_INCLUDED
25 # error "Never use <lzcntintrin.h> directly; include <x86intrin.h> instead."
29 # error "LZCNT instruction is not enabled"
30 #endif /* __LZCNT__ */
32 #ifndef _LZCNTINTRIN_H_INCLUDED
33 #define _LZCNTINTRIN_H_INCLUDED
35 extern __inline
unsigned short __attribute__((__gnu_inline__
, __always_inline__
, __artificial__
))
36 __lzcnt16 (unsigned short __X
)
38 return __builtin_clzs (__X
);
41 extern __inline
unsigned int __attribute__((__gnu_inline__
, __always_inline__
, __artificial__
))
42 __lzcnt32 (unsigned int __X
)
44 return __builtin_clz (__X
);
48 extern __inline
unsigned long long __attribute__((__gnu_inline__
, __always_inline__
, __artificial__
))
49 __lzcnt64 (unsigned long long __X
)
51 return __builtin_clzll (__X
);
55 #endif /* _LZCNTINTRIN_H_INCLUDED */