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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 static __inline__ unsigned short __DEFAULT_FN_ATTRS
__lzcnt16(unsigned short __X)35 __lzcnt16(unsigned short __X)
36 {
37   return __X ? __builtin_clzs(__X) : 16;
38 }
39 
40 static __inline__ unsigned int __DEFAULT_FN_ATTRS
__lzcnt32(unsigned int __X)41 __lzcnt32(unsigned int __X)
42 {
43   return __X ? __builtin_clz(__X) : 32;
44 }
45 
46 static __inline__ unsigned int __DEFAULT_FN_ATTRS
_lzcnt_u32(unsigned int __X)47 _lzcnt_u32(unsigned int __X)
48 {
49   return __X ? __builtin_clz(__X) : 32;
50 }
51 
52 #ifdef __x86_64__
53 static __inline__ unsigned long long __DEFAULT_FN_ATTRS
__lzcnt64(unsigned long long __X)54 __lzcnt64(unsigned long long __X)
55 {
56   return __X ? __builtin_clzll(__X) : 64;
57 }
58 
59 static __inline__ unsigned long long __DEFAULT_FN_ATTRS
_lzcnt_u64(unsigned long long __X)60 _lzcnt_u64(unsigned long long __X)
61 {
62   return __X ? __builtin_clzll(__X) : 64;
63 }
64 #endif
65 
66 #undef __DEFAULT_FN_ATTRS
67 
68 #endif /* __LZCNTINTRIN_H */
69