🚀 go-pugleaf

In article <4814@killer.UUCP>, richardh@killer.UUCP (Richard Hargrove) writes:
> 
> First, these mnemonics are not documented in Intel's _80386 Programmer's 
> Reference Manual_. I checked both chapter 17, "80386 Instruction Set",
> and Appendix A, Opcode Map. So my question is: What opcodes are supposed to
> be the correct ones for the above instructions? 
> 

Yes, I know that: These opcodes are mentioned on 386's datasheet dated
may -86. The opcodes for these were:

	XBTS	0F A6 mod reg  r/m  (total 3 bytes)+ 2 (386 addr. mode)	
	IBTS    0F A7 mod reg  r/m               -//-

danno@microsof told me the following: (thanks to you danno)

To: uunet!tut!jja
Subject: Re: Raiders of the lost opcodes of the 80386
In-reply-to: your article <4071@korppi.tut.fi>

I don't know Microsoft's position, but I know that Intel no longer
supports the op-codes.  It turns out that it is faster to do the
same thing using the double-precision shift instructions.

The technique is detailed in the "80386 Programmer's Manual", order
number 230985-001.

-jja

-- 
Jari 'jja' Ahola	| Tampere University of Technology, CS dept.
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