lzcntintrin.h revision 344779 
1/*===---- lzcntintrin.h - LZCNT intrinsics ---------------------------------===
2 *
3 * Permission is hereby granted, free of charge, to any person obtaining a copy
4 * of this software and associated documentation files (the "Software"), to deal
5 * in the Software without restriction, including without limitation the rights
6 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
7 * copies of the Software, and to permit persons to whom the Software is
8 * furnished to do so, subject to the following conditions:
9 *
10 * The above copyright notice and this permission notice shall be included in
11 * all copies or substantial portions of the Software.
12 *
13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
18 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
19 * THE SOFTWARE.
20 *
21 *===-----------------------------------------------------------------------===
22 */
23
24#if !defined __X86INTRIN_H && !defined __IMMINTRIN_H
25#error "Never use <lzcntintrin.h> directly; include <x86intrin.h> instead."
26#endif
27
28#ifndef __LZCNTINTRIN_H
29#define __LZCNTINTRIN_H
30
31/* Define the default attributes for the functions in this file. */
32#define __DEFAULT_FN_ATTRS __attribute__((__always_inline__, __nodebug__, __target__("lzcnt")))
33
34#ifndef _MSC_VER
35/// Counts the number of leading zero bits in the operand.
36///
37/// \headerfile <x86intrin.h>
38///
39/// This intrinsic corresponds to the \c LZCNT instruction.
40///
41/// \param __X
42///    An unsigned 16-bit integer whose leading zeros are to be counted.
43/// \returns An unsigned 16-bit integer containing the number of leading zero
44///    bits in the operand.
45#define __lzcnt16(X) __builtin_ia32_lzcnt_u16((unsigned short)(X))
46#endif // _MSC_VER
47
48/// Counts the number of leading zero bits in the operand.
49///
50/// \headerfile <x86intrin.h>
51///
52/// This intrinsic corresponds to the \c LZCNT instruction.
53///
54/// \param __X
55///    An unsigned 32-bit integer whose leading zeros are to be counted.
56/// \returns An unsigned 32-bit integer containing the number of leading zero
57///    bits in the operand.
58/// \see _lzcnt_u32
59static __inline__ unsigned int __DEFAULT_FN_ATTRS
60__lzcnt32(unsigned int __X)
61{
62  return __builtin_ia32_lzcnt_u32(__X);
63}
64
65/// Counts the number of leading zero bits in the operand.
66///
67/// \headerfile <x86intrin.h>
68///
69/// This intrinsic corresponds to the \c LZCNT instruction.
70///
71/// \param __X
72///    An unsigned 32-bit integer whose leading zeros are to be counted.
73/// \returns An unsigned 32-bit integer containing the number of leading zero
74///    bits in the operand.
75/// \see __lzcnt32
76static __inline__ unsigned int __DEFAULT_FN_ATTRS
77_lzcnt_u32(unsigned int __X)
78{
79  return __builtin_ia32_lzcnt_u32(__X);
80}
81
82#ifdef __x86_64__
83#ifndef _MSC_VER
84/// Counts the number of leading zero bits in the operand.
85///
86/// \headerfile <x86intrin.h>
87///
88/// This intrinsic corresponds to the \c LZCNT instruction.
89///
90/// \param __X
91///    An unsigned 64-bit integer whose leading zeros are to be counted.
92/// \returns An unsigned 64-bit integer containing the number of leading zero
93///    bits in the operand.
94/// \see _lzcnt_u64
95#define __lzcnt64(X) __builtin_ia32_lzcnt_u64((unsigned long long)(X))
96#endif // _MSC_VER
97
98/// Counts the number of leading zero bits in the operand.
99///
100/// \headerfile <x86intrin.h>
101///
102/// This intrinsic corresponds to the \c LZCNT instruction.
103///
104/// \param __X
105///    An unsigned 64-bit integer whose leading zeros are to be counted.
106/// \returns An unsigned 64-bit integer containing the number of leading zero
107///    bits in the operand.
108/// \see __lzcnt64
109static __inline__ unsigned long long __DEFAULT_FN_ATTRS
110_lzcnt_u64(unsigned long long __X)
111{
112  return __builtin_ia32_lzcnt_u64(__X);
113}
114#endif
115
116#undef __DEFAULT_FN_ATTRS
117
118#endif /* __LZCNTINTRIN_H */
119