35.3.9.8. INTEGER BITS AND BITSTRING ON X86

	(Bit Scan Forward) ===============
BSF	r16,r/m16		0F BC
BSF	r32,r/m32		0F BC

	if r/m = 0 
	{
		ZF <- 1
		r  <- Undefined
	} else
	{
		temp <- 0
		ZF <-  0
		while bite[r/m,temp] = 0
		DO
			temp <- temp + 1
			r <- temp
		OD
	}


	(Bit Scan Reverse) ===============
BSF	r16,r/m16		0F BD
BSF	r32,r/m32		0F BD

	if r/m = 0 
	{
		ZF <- 1
		r  <- Undefined
	} else
	{
		temp <- OperandSize - 1
		ZF <-  0
		while bite[r/m,temp] = 0
		DO
			temp <- temp - 1
			r <- temp
		OD
	}


	(Bit Test) =========================
BT	r/m16,r16		0F A3
BT	r/m32,r32		0F A3
BT	r/m16,i8		0F BA /4 ib
BT	r/m32,i8		0F BA /4 ib

	CF <- BIT[r/m,r/i]


	(Bit Test and Complement) ==============
BTC	r/m16,r16		0F BB
BTC	r/m32,r32		0F BB
BTC	r/m16,i8		0F BA /7 ib
BTC	r/m32,i8		0F BA /7 ib

	CF <- BIT[r/m,r/i]
	BIT[r/m,r/i] <- NOT BIT[r/m,r/i]

	(Bit Test and Reset) ==============
BTR	r/m16,r16		0F B3
BTR	r/m32,r32		0F B3
BTR	r/m16,i8		0F BA /6 ib
BTR	r/m32,i8		0F BA /6 ib

	CF <- BIT[r/m,r/i]
	BIT[r/m,r/i] <- 0


	(Bit Test and Set) ==============
BTS	r/m16,r16		0F AB
BTS	r/m32,r32		0F AB
BTS	r/m16,i8		0F BA /5 ib
BTS	r/m32,i8		0F BA /5 ib

	CF <- BIT[r/m,r/i]
	BIT[r/m,r/i] <- 1


Note: Use SHLD,SHRD for Extract Bitstrings