lzcntintrin.h File Reference

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Macros
#define	__DEFAULT_FN_ATTRS   __attribute__((__always_inline__, __nodebug__, __target__("lzcnt")))
#define	__lzcnt16(X)   __builtin_ia32_lzcnt_u16((unsigned short)(X))
	Counts the number of leading zero bits in the operand.

Functions
static __inline__ unsigned int __DEFAULT_FN_ATTRS	__lzcnt32 (unsigned int __X)
	Counts the number of leading zero bits in the operand.
static __inline__ unsigned int __DEFAULT_FN_ATTRS	_lzcnt_u32 (unsigned int __X)
	Counts the number of leading zero bits in the operand.

Macro Definition Documentation

__DEFAULT_FN_ATTRS

#define __DEFAULT_FN_ATTRS   __attribute__((__always_inline__, __nodebug__, __target__("lzcnt")))

Definition at line 18 of file lzcntintrin.h.

__lzcnt16

#define __lzcnt16

(

X

)

__builtin_ia32_lzcnt_u16((unsigned short)(X))

Counts the number of leading zero bits in the operand.

This intrinsic corresponds to the LZCNT instruction.

Parameters

__X	An unsigned 16-bit integer whose leading zeros are to be counted.

Returns

An unsigned 16-bit integer containing the number of leading zero bits in the operand.

Definition at line 31 of file lzcntintrin.h.

Function Documentation

__lzcnt32()

static __inline__ unsigned int __DEFAULT_FN_ATTRS __lzcnt32 ( unsigned int  __X )

static

Counts the number of leading zero bits in the operand.

This intrinsic corresponds to the LZCNT instruction.

Parameters

__X	An unsigned 32-bit integer whose leading zeros are to be counted.

Returns

An unsigned 32-bit integer containing the number of leading zero bits in the operand.

See also

_lzcnt_u32

Definition at line 46 of file lzcntintrin.h.

_lzcnt_u32()

static __inline__ unsigned int __DEFAULT_FN_ATTRS _lzcnt_u32 ( unsigned int  __X )

static

Counts the number of leading zero bits in the operand.

This intrinsic corresponds to the LZCNT instruction.

Parameters

__X	An unsigned 32-bit integer whose leading zeros are to be counted.

Returns

An unsigned 32-bit integer containing the number of leading zero bits in the operand.

See also

__lzcnt32

Definition at line 63 of file lzcntintrin.h.