MemOps

# LEA - Load Effective Address

Syntax:
-------
	lea <dest>, [<Base>+(<Index>*<Scale>)+<Displacement>]

Description:
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LEA calculates the effective address in one pass and stores the result in <dest> register. The effective address formula has few bindings:

1) Only base and index can be a register value.
2) Only base address and displacement address can be supplied by a variable lebel. Only one variable lebel can be used inside the expression.
3) Immediate values can be used in any number. Any combination of addition and multiplication can be used for immediate values.
4) The destination operand must be a register. There's no restriction for 64/32/16/8-bit.

Examples:
	lea	rax,[rbx+rcx*2+64+32*2+64*4]; Only Base and Index are register value. Then any number of immediate values.
	lea r15, [base+rbx*2+64]		; Only Base address is supplied by a variable lebel.
	lea rax, [base+rcx*rax+64]		; Scale can't be a register value. This will not assemble.
	lea rdx, [rax+rcx*2+rbx]		; Displacement is a register value, won't assemble.
	lea [varia], [rax*2+rcx]		; Destination operand is a variable, won't assemble.