asm {
_DIV_U64_BY_U64::
				PUSH		RBP
				MOV 		RBP, RSP
				XOR 		RDX, RDX
				MOV 		RCX, 64
				MOV 		RAX, SF_ARG1[RBP]
				MOV 		RBX, SF_ARG2[RBP]
@@1:			SHL1		RAX
				RCL1		RDX
				CMP 		RBX, RDX
				JA			@@2
				INC 		RAX
				SUB 		RDX, RBX
@@2:			LOOP		@@1
				POP 		RBP
				RET1		16
}

_extern _DIV_U64_BY_U64 I64 DivU64ByU64(I64 dividend, I64 divisor);

"123456/10=%d\n", DivU64ByU64(123456, 10);