(MOV-I) ( dst src -- )

Vocabulary

cpu.x86.assembler.private

Inputs

dst	destination
src	immediate value

Outputs

None

Word description

MOV where 'src' is immediate. If dst is a 64-bit register and the 'src' value fits in 32 bits, then zero extension is taken advantage of by downgrading 'dst' to a 32-bit register. That way, the instruction gets a shorter encoding.

Definition

IN: cpu.x86.assembler.private

GENERIC#: (MOV-I) 1 ( dst src -- )

Methods

USING: cpu.x86.assembler.operands
cpu.x86.assembler.operands.private cpu.x86.assembler.private
kernel ;

M: operand (MOV-I)
    { 0 t 198 } over byte? [ immediate-1 ] [ immediate-4 ] if ;


USING: combinators cpu.x86.assembler.operands
cpu.x86.assembler.private kernel ;

M: register (MOV-I)
    {
        { [ dup byte? ] [ [ t 176 short-operand ] [ 1, ] bi* ] }
        {
            [ dup zero-extendable? ]
            [
                [ 32-bit-version-of t 184 short-operand ] [ 4, ]
                bi*
            ]
        }
        [ [ t 184 short-operand ] [ cell, ] bi* ]
    } cond ;