1 /*===---- lzcntintrin.h - LZCNT intrinsics ---------------------------------===
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21 *===-----------------------------------------------------------------------===
24 #if !defined __X86INTRIN_H && !defined __IMMINTRIN_H
25 #error "Never use <lzcntintrin.h> directly; include <x86intrin.h> instead."
28 #ifndef __LZCNTINTRIN_H
29 #define __LZCNTINTRIN_H
31 /* Define the default attributes for the functions in this file. */
32 #define __DEFAULT_FN_ATTRS __attribute__((__always_inline__, __nodebug__, __target__("lzcnt")))
35 /// Counts the number of leading zero bits in the operand.
37 /// \headerfile <x86intrin.h>
39 /// This intrinsic corresponds to the \c LZCNT instruction.
42 /// An unsigned 16-bit integer whose leading zeros are to be counted.
43 /// \returns An unsigned 16-bit integer containing the number of leading zero
44 /// bits in the operand.
45 #define __lzcnt16(X) __builtin_ia32_lzcnt_u16((unsigned short)(X))
48 /// Counts the number of leading zero bits in the operand.
50 /// \headerfile <x86intrin.h>
52 /// This intrinsic corresponds to the \c LZCNT instruction.
55 /// An unsigned 32-bit integer whose leading zeros are to be counted.
56 /// \returns An unsigned 32-bit integer containing the number of leading zero
57 /// bits in the operand.
59 static __inline__ unsigned int __DEFAULT_FN_ATTRS
60 __lzcnt32(unsigned int __X)
62 return __builtin_ia32_lzcnt_u32(__X);
65 /// Counts the number of leading zero bits in the operand.
67 /// \headerfile <x86intrin.h>
69 /// This intrinsic corresponds to the \c LZCNT instruction.
72 /// An unsigned 32-bit integer whose leading zeros are to be counted.
73 /// \returns An unsigned 32-bit integer containing the number of leading zero
74 /// bits in the operand.
76 static __inline__ unsigned int __DEFAULT_FN_ATTRS
77 _lzcnt_u32(unsigned int __X)
79 return __builtin_ia32_lzcnt_u32(__X);
84 /// Counts the number of leading zero bits in the operand.
86 /// \headerfile <x86intrin.h>
88 /// This intrinsic corresponds to the \c LZCNT instruction.
91 /// An unsigned 64-bit integer whose leading zeros are to be counted.
92 /// \returns An unsigned 64-bit integer containing the number of leading zero
93 /// bits in the operand.
95 #define __lzcnt64(X) __builtin_ia32_lzcnt_u64((unsigned long long)(X))
98 /// Counts the number of leading zero bits in the operand.
100 /// \headerfile <x86intrin.h>
102 /// This intrinsic corresponds to the \c LZCNT instruction.
105 /// An unsigned 64-bit integer whose leading zeros are to be counted.
106 /// \returns An unsigned 64-bit integer containing the number of leading zero
107 /// bits in the operand.
109 static __inline__ unsigned long long __DEFAULT_FN_ATTRS
110 _lzcnt_u64(unsigned long long __X)
112 return __builtin_ia32_lzcnt_u64(__X);
116 #undef __DEFAULT_FN_ATTRS
118 #endif /* __LZCNTINTRIN_H */