Vocabulary
cpu.x86.assembler.private

Inputs and outputs

dst	dst
imm	imm
reg,rex.w,opcode	a sequence

Word description
If imm is a byte, compile the opcode and the byte. Otherwise, set the 8-bit operand flag in the opcode, and compile the cell. The 'reg' is not really a register, but a value for the 'reg' field of the mod-r/m byte.

Definition

USING: kernel ;

IN: cpu.x86.assembler.private

: immediate-1/4 ( dst imm reg,rex.w,opcode -- )
over fits-in-byte?
[ immediate-fits-in-size-bit immediate-1 ] [ immediate-4 ]
if ;