[LLVMdev] registerSize on X86 confused?
Jun Koi
junkoi2004 at gmail.com
Tue Apr 1 16:43:23 PDT 2014
On Mon, Mar 31, 2014 at 11:48 PM, Jun Koi <junkoi2004 at gmail.com> wrote:
> Hi,
>
> In file X86DisassemblerDecoder.c, we have function readPrefixes() with
> below code:
>
> .....
> } else if (insn->mode == MODE_32BIT) {
> insn->registerSize = (hasOpSize ? 2 : 4);
> insn->addressSize = (hasAdSize ? 2 : 4);
> insn->displacementSize = (hasAdSize ? 2 : 4);
> insn->immediateSize = (hasOpSize ? 2 : 4);
> }
> ....
>
> This is confused to me: so we have registerSize to be either 2 or 4 bytes.
> But we might have instruction like:
>
> adc al, 0x89
>
> This case we should have registerSize = 1 for AL. So is this a bug, or I
> am misunderstanding the meaning of this "registerSize" ??
>
>
any help please?
thanks.
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