24 #if !defined __X86INTRIN_H && !defined __IMMINTRIN_H
25 #error "Never use <lzcntintrin.h> directly; include <x86intrin.h> instead."
29 # error "LZCNT instruction is not enabled"
32 #ifndef __LZCNTINTRIN_H
33 #define __LZCNTINTRIN_H
36 #define __DEFAULT_FN_ATTRS __attribute__((__always_inline__, __nodebug__))
41 return __X ? __builtin_clzs(__X) : 16;
47 return __X ? __builtin_clz(__X) : 32;
53 return __X ? __builtin_clz(__X) : 32;
58 __lzcnt64(
unsigned long long __X)
60 return __X ? __builtin_clzll(__X) : 64;
64 _lzcnt_u64(
unsigned long long __X)
66 return __X ? __builtin_clzll(__X) : 64;
70 #undef __DEFAULT_FN_ATTRS
static __inline__ unsigned short __DEFAULT_FN_ATTRS __lzcnt16(unsigned short __X)
static __inline__ unsigned int __DEFAULT_FN_ATTRS _lzcnt_u32(unsigned int __X)
static __inline__ unsigned int __DEFAULT_FN_ATTRS __lzcnt32(unsigned int __X)
#define __DEFAULT_FN_ATTRS