On 05/26/2011 09:07 AM, Gleb Natapov wrote:
> Still, op_bytes is irrelevant for > SrcDX, the 16-bit version is always used. If SrcDX/DstDX will be used only for decoding in/out instruction then yes. Otherwise it is nice to have more general decoder.
Not counting instructions that read/write many registers (rdmsr/wrmsr, mul/imul/div/idiv, rdtsc, etc.), I think the only other instruction with an implicit DstDX is cwd/cdq/cqo. Since cwd/cdq/cqo needs c->dst.bytes = c->src.bytes (not op_bytes) I think DstDX is not really reusable beyond port instructions.
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