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From: anton@mips.complang.tuwien.ac.at (Anton Ertl)
Newsgroups: comp.arch
Subject: Re: Another security vulnerability
Date: Wed, 27 Mar 2024 18:14:11 GMT
Organization: Institut fuer Computersprachen, Technische Universitaet Wien
Lines: 16
Message-ID: <2024Mar27.191411@mips.complang.tuwien.ac.at>
References: <utpoi2$b6to$1@dont-email.me> <2024Mar25.082534@mips.complang.tuwien.ac.at> <20240326192941.0000314a@yahoo.com> <uu0kt1$2nr9j$1@dont-email.me> <VpVMN.731075$p%Mb.618266@fx15.iad>
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EricP <ThatWouldBeTelling@thevillage.com> writes:
>It doesn't need to eat opcode space if you only support one data type,
>64-bit ints, and one address mode, [register].
>Other address modes can be calculated using LEA.
>Since these are rare instructions to solve a particular problem,
>they won't be used that often, so a few extra instructions shouldn't matter.

You lost me here.  Do you mean that a load with address mode
[register] is considered to be a non-address load and not followed by
the data-dependent prefetcher?  So how would an address load be
encoded if the natural expression would be [register]?

- anton
-- 
'Anyone trying for "industrial quality" ISA should avoid undefined behavior.'
  Mitch Alsup, <c17fcd89-f024-40e7-a594-88a85ac10d20o@googlegroups.com>