; Return in register EAX the number of the coincident bits on the same position
; in the words, passed in registers RDI, RSI and RDX.

option prologue:none, epilogue:none
.code
nsamebit proc
_nsamebit proc
	XOR	RDI,RDX	; RDI ^= RDX (coincident bits become 0, the rest - 1)
	XOR	RSI,RDX	; RSI ^= RDX ( "   "   "   "   "   "   "   "   "   ")
	OR	RDI,RSI	; RDI = RDI ^ RDX | RSI ^ RDX ("   "   "   "   "   ")
	NOT	RDI	; Make the coincident bits log. 1, non-coincident - 0
	POPCNT	RAX,RDI	; Count the coincident bits
	RET		; and return their number in EAX (RAX)
_nsamebit endp
nsamebit endp
end