On 08/23/2010 01:06 PM, Avi Kivity wrote:
Many x86 instructions come in pairs - byte and word variants where bit 0
of the opcode determines operand size.  Use this to simplify the decode
tables.

Many actually come in quadruples, bit 0 is the size and bit 1 says which of ModRM and REG is the destination.

example:

D2bv(DstMem | SrcReg | ModRM | Lock), D2bv(DstReg | SrcMem | ModRM),

Paolo
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