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B

Name	Operator	Operand	Operation Name
bound	bound	m16&16,r16	Check Array Index Against Bounds
	bound	m32&32,r32

bsf	bsf	r/m16,r16	Bit Scan Forward
	bsf	r/m32,r16

bsr	bsr	r/m16,r16	Bit Scan Reverse
	bsr	r/m32,r16

bswap	bswap	r32	Byte Swap (i486-specific)

bt	bt	r16,r/m16	Bit Test
	bt	r32,r/m32
	bt	$ imm8,r/m16
	bt	$ imm8,r/m32

btc	btc	r16,r/m16	Bit Test and Complement
	btc	r32,r/m32
	btc	$ imm8,r/m16
	btc	$ imm8,r/m32

btr	btr	r16,r/m16	Bit Test and Reset
	btr	r32,r/m32
	btr	$ imm8,r/m16
	btr	$ imm8,r/m32

bts	bts	r16,r/m16	Bit Test and Set
	bts	r32,r/m32
	bts	$ imm8,r/m16
	bts	$ imm8,r/m32

Mac OS X Assembler Reference: i386 Addressing Modes and Assembler Instructions