15c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper/*===---- lzcntintrin.h - LZCNT intrinsics ---------------------------------=== 25c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper * 35c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper * Permission is hereby granted, free of charge, to any person obtaining a copy 45c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper * of this software and associated documentation files (the "Software"), to deal 55c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper * in the Software without restriction, including without limitation the rights 65c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 75c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper * copies of the Software, and to permit persons to whom the Software is 85c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper * furnished to do so, subject to the following conditions: 95c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper * 105c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper * The above copyright notice and this permission notice shall be included in 115c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper * all copies or substantial portions of the Software. 125c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper * 135c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 145c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 155c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 165c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 175c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 185c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 195c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper * THE SOFTWARE. 205c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper * 215c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper *===-----------------------------------------------------------------------=== 225c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper */ 235c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper 245c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper#if !defined __X86INTRIN_H && !defined __IMMINTRIN_H 255c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper#error "Never use <lzcntintrin.h> directly; include <x86intrin.h> instead." 265c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper#endif 275c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper 285c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper#ifndef __LZCNT__ 295c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper# error "LZCNT instruction is not enabled" 305c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper#endif /* __LZCNT__ */ 315c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper 325c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper#ifndef __LZCNTINTRIN_H 335c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper#define __LZCNTINTRIN_H 345c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper 355c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topperstatic __inline__ unsigned short __attribute__((__always_inline__, __nodebug__)) 365c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper__lzcnt16(unsigned short __X) 375c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper{ 385c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper return __builtin_clzs(__X); 395c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper} 405c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper 415c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topperstatic __inline__ unsigned int __attribute__((__always_inline__, __nodebug__)) 425c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper__lzcnt32(unsigned int __X) 435c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper{ 445c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper return __builtin_clz(__X); 455c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper} 465c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper 475c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper#ifdef __x86_64__ 485c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topperstatic __inline__ unsigned long long __attribute__((__always_inline__, __nodebug__)) 495c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper__lzcnt64(unsigned long long __X) 505c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper{ 515c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper return __builtin_clzll(__X); 525c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper} 535c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper#endif 545c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper 555c75208a5b88c835bce0a1671015c7e22c72f35fCraig Topper#endif /* __LZCNTINTRIN_H */ 56