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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 __LZCNT__ |
| 29 # error "LZCNT instruction is not enabled" |
| 30 #endif /* __LZCNT__ */ |
| 31 |
| 32 #ifndef __LZCNTINTRIN_H |
| 33 #define __LZCNTINTRIN_H |
| 34 |
| 35 static __inline__ unsigned short __attribute__((__always_inline__, __nodebug__)) |
| 36 __lzcnt16(unsigned short __X) |
| 37 { |
| 38 return __builtin_clzs(__X); |
| 39 } |
| 40 |
| 41 static __inline__ unsigned int __attribute__((__always_inline__, __nodebug__)) |
| 42 __lzcnt32(unsigned int __X) |
| 43 { |
| 44 return __builtin_clz(__X); |
| 45 } |
| 46 |
| 47 #ifdef __x86_64__ |
| 48 static __inline__ unsigned long long __attribute__((__always_inline__, __nodebug
__)) |
| 49 __lzcnt64(unsigned long long __X) |
| 50 { |
| 51 return __builtin_clzll(__X); |
| 52 } |
| 53 #endif |
| 54 |
| 55 #endif /* __LZCNTINTRIN_H */ |
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