1*67e74705SXin Li /*===---- lzcntintrin.h - LZCNT intrinsics ---------------------------------===
2*67e74705SXin Li *
3*67e74705SXin Li * Permission is hereby granted, free of charge, to any person obtaining a copy
4*67e74705SXin Li * of this software and associated documentation files (the "Software"), to deal
5*67e74705SXin Li * in the Software without restriction, including without limitation the rights
6*67e74705SXin Li * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
7*67e74705SXin Li * copies of the Software, and to permit persons to whom the Software is
8*67e74705SXin Li * furnished to do so, subject to the following conditions:
9*67e74705SXin Li *
10*67e74705SXin Li * The above copyright notice and this permission notice shall be included in
11*67e74705SXin Li * all copies or substantial portions of the Software.
12*67e74705SXin Li *
13*67e74705SXin Li * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14*67e74705SXin Li * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15*67e74705SXin Li * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16*67e74705SXin Li * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17*67e74705SXin Li * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
18*67e74705SXin Li * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
19*67e74705SXin Li * THE SOFTWARE.
20*67e74705SXin Li *
21*67e74705SXin Li *===-----------------------------------------------------------------------===
22*67e74705SXin Li */
23*67e74705SXin Li
24*67e74705SXin Li #if !defined __X86INTRIN_H && !defined __IMMINTRIN_H
25*67e74705SXin Li #error "Never use <lzcntintrin.h> directly; include <x86intrin.h> instead."
26*67e74705SXin Li #endif
27*67e74705SXin Li
28*67e74705SXin Li #ifndef __LZCNTINTRIN_H
29*67e74705SXin Li #define __LZCNTINTRIN_H
30*67e74705SXin Li
31*67e74705SXin Li /* Define the default attributes for the functions in this file. */
32*67e74705SXin Li #define __DEFAULT_FN_ATTRS __attribute__((__always_inline__, __nodebug__, __target__("lzcnt")))
33*67e74705SXin Li
34*67e74705SXin Li static __inline__ unsigned short __DEFAULT_FN_ATTRS
__lzcnt16(unsigned short __X)35*67e74705SXin Li __lzcnt16(unsigned short __X)
36*67e74705SXin Li {
37*67e74705SXin Li return __X ? __builtin_clzs(__X) : 16;
38*67e74705SXin Li }
39*67e74705SXin Li
40*67e74705SXin Li static __inline__ unsigned int __DEFAULT_FN_ATTRS
__lzcnt32(unsigned int __X)41*67e74705SXin Li __lzcnt32(unsigned int __X)
42*67e74705SXin Li {
43*67e74705SXin Li return __X ? __builtin_clz(__X) : 32;
44*67e74705SXin Li }
45*67e74705SXin Li
46*67e74705SXin Li static __inline__ unsigned int __DEFAULT_FN_ATTRS
_lzcnt_u32(unsigned int __X)47*67e74705SXin Li _lzcnt_u32(unsigned int __X)
48*67e74705SXin Li {
49*67e74705SXin Li return __X ? __builtin_clz(__X) : 32;
50*67e74705SXin Li }
51*67e74705SXin Li
52*67e74705SXin Li #ifdef __x86_64__
53*67e74705SXin Li static __inline__ unsigned long long __DEFAULT_FN_ATTRS
__lzcnt64(unsigned long long __X)54*67e74705SXin Li __lzcnt64(unsigned long long __X)
55*67e74705SXin Li {
56*67e74705SXin Li return __X ? __builtin_clzll(__X) : 64;
57*67e74705SXin Li }
58*67e74705SXin Li
59*67e74705SXin Li static __inline__ unsigned long long __DEFAULT_FN_ATTRS
_lzcnt_u64(unsigned long long __X)60*67e74705SXin Li _lzcnt_u64(unsigned long long __X)
61*67e74705SXin Li {
62*67e74705SXin Li return __X ? __builtin_clzll(__X) : 64;
63*67e74705SXin Li }
64*67e74705SXin Li #endif
65*67e74705SXin Li
66*67e74705SXin Li #undef __DEFAULT_FN_ATTRS
67*67e74705SXin Li
68*67e74705SXin Li #endif /* __LZCNTINTRIN_H */
69