gcc/config/i386/lzcntintrin.h

   1 /* Copyright (C) 2009-2015 Free Software Foundation, Inc.
   2
   3    This file is part of GCC.
   4
   5    GCC is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3, or (at your option)
   8    any later version.
   9
  10    GCC is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    Under Section 7 of GPL version 3, you are granted additional
  16    permissions described in the GCC Runtime Library Exception, version
  17    3.1, as published by the Free Software Foundation.
  18
  19    You should have received a copy of the GNU General Public License and
  20    a copy of the GCC Runtime Library Exception along with this program;
  21    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  22    <http://www.gnu.org/licenses/>.  */
  23
  24 #if !defined _X86INTRIN_H_INCLUDED && !defined _IMMINTRIN_H_INCLUDED
  25 # error "Never use <lzcntintrin.h> directly; include <x86intrin.h> instead."
  26 #endif
  27
  28
  29 #ifndef _LZCNTINTRIN_H_INCLUDED
  30 #define _LZCNTINTRIN_H_INCLUDED
  31
  32 #ifndef __LZCNT__
  33 #pragma GCC push_options
  34 #pragma GCC target("lzcnt")
  35 #define __DISABLE_LZCNT__
  36 #endif /* __LZCNT__ */
  37
  38 extern __inline unsigned short __attribute__((__gnu_inline__, __always_inline__, __artificial__))
  39 __lzcnt16 (unsigned short __X)
  40 {
  41   return __builtin_clzs (__X);
  42 }
  43
  44 extern __inline unsigned int __attribute__((__gnu_inline__, __always_inline__, __artificial__))
  45 __lzcnt32 (unsigned int __X)
  46 {
  47   return __builtin_clz (__X);
  48 }
  49
  50 extern __inline unsigned int __attribute__((__gnu_inline__, __always_inline__, __artificial__))
  51 _lzcnt_u32 (unsigned int __X)
  52 {
  53   return __builtin_clz (__X);
  54 }
  55
  56 #ifdef __x86_64__
  57 extern __inline unsigned long long __attribute__((__gnu_inline__, __always_inline__, __artificial__))
  58 __lzcnt64 (unsigned long long __X)
  59 {
  60   return __builtin_clzll (__X);
  61 }
  62
  63 extern __inline unsigned long long __attribute__((__gnu_inline__, __always_inline__, __artificial__))
  64 _lzcnt_u64 (unsigned long long __X)
  65 {
  66   return __builtin_clzll (__X);
  67 }
  68 #endif
  69
  70 #ifdef __DISABLE_LZCNT__
  71 #undef __DISABLE_LZCNT__
  72 #pragma GCC pop_options
  73 #endif /* __DISABLE_LZCNT__ */
  74
  75 #endif /* _LZCNTINTRIN_H_INCLUDED */